<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `libstd/sync/mpsc/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../../light.css" id="themeStyle"><script src="../../../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../../../settings.html"><img src="../../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust ">
<span class="comment">// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">//! Multi-producer, single-consumer FIFO queue communication primitives.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This module provides message-based communication over channels, concretely</span>
<span class="doccomment">//! defined among three types:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * [`Sender`]</span>
<span class="doccomment">//! * [`SyncSender`]</span>
<span class="doccomment">//! * [`Receiver`]</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! A [`Sender`] or [`SyncSender`] is used to send data to a [`Receiver`]. Both</span>
<span class="doccomment">//! senders are clone-able (multi-producer) such that many threads can send</span>
<span class="doccomment">//! simultaneously to one receiver (single-consumer).</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! These channels come in two flavors:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! 1. An asynchronous, infinitely buffered channel. The [`channel`] function</span>
<span class="doccomment">//! will return a `(Sender, Receiver)` tuple where all sends will be</span>
<span class="doccomment">//! **asynchronous** (they never block). The channel conceptually has an</span>
<span class="doccomment">//! infinite buffer.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! 2. A synchronous, bounded channel. The [`sync_channel`] function will</span>
<span class="doccomment">//! return a `(SyncSender, Receiver)` tuple where the storage for pending</span>
<span class="doccomment">//! messages is a pre-allocated buffer of a fixed size. All sends will be</span>
<span class="doccomment">//! **synchronous** by blocking until there is buffer space available. Note</span>
<span class="doccomment">//! that a bound of 0 is allowed, causing the channel to become a "rendezvous"</span>
<span class="doccomment">//! channel where each sender atomically hands off a message to a receiver.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`Sender`]: ../../../std/sync/mpsc/struct.Sender.html</span>
<span class="doccomment">//! [`SyncSender`]: ../../../std/sync/mpsc/struct.SyncSender.html</span>
<span class="doccomment">//! [`Receiver`]: ../../../std/sync/mpsc/struct.Receiver.html</span>
<span class="doccomment">//! [`send`]: ../../../std/sync/mpsc/struct.Sender.html#method.send</span>
<span class="doccomment">//! [`channel`]: ../../../std/sync/mpsc/fn.channel.html</span>
<span class="doccomment">//! [`sync_channel`]: ../../../std/sync/mpsc/fn.sync_channel.html</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Disconnection</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The send and receive operations on channels will all return a [`Result`]</span>
<span class="doccomment">//! indicating whether the operation succeeded or not. An unsuccessful operation</span>
<span class="doccomment">//! is normally indicative of the other half of a channel having "hung up" by</span>
<span class="doccomment">//! being dropped in its corresponding thread.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Once half of a channel has been deallocated, most operations can no longer</span>
<span class="doccomment">//! continue to make progress, so [`Err`] will be returned. Many applications</span>
<span class="doccomment">//! will continue to [`unwrap`] the results returned from this module,</span>
<span class="doccomment">//! instigating a propagation of failure among threads if one unexpectedly dies.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`Result`]: ../../../std/result/enum.Result.html</span>
<span class="doccomment">//! [`Err`]: ../../../std/result/enum.Result.html#variant.Err</span>
<span class="doccomment">//! [`unwrap`]: ../../../std/result/enum.Result.html#method.unwrap</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Examples</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Simple usage:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::thread;</span>
<span class="doccomment">//! use std::sync::mpsc::channel;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // Create a simple streaming channel</span>
<span class="doccomment">//! let (tx, rx) = channel();</span>
<span class="doccomment">//! thread::spawn(move|| {</span>
<span class="doccomment">//! tx.send(10).unwrap();</span>
<span class="doccomment">//! });</span>
<span class="doccomment">//! assert_eq!(rx.recv().unwrap(), 10);</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Shared usage:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::thread;</span>
<span class="doccomment">//! use std::sync::mpsc::channel;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // Create a shared channel that can be sent along from many threads</span>
<span class="doccomment">//! // where tx is the sending half (tx for transmission), and rx is the receiving</span>
<span class="doccomment">//! // half (rx for receiving).</span>
<span class="doccomment">//! let (tx, rx) = channel();</span>
<span class="doccomment">//! for i in 0..10 {</span>
<span class="doccomment">//! let tx = tx.clone();</span>
<span class="doccomment">//! thread::spawn(move|| {</span>
<span class="doccomment">//! tx.send(i).unwrap();</span>
<span class="doccomment">//! });</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! for _ in 0..10 {</span>
<span class="doccomment">//! let j = rx.recv().unwrap();</span>
<span class="doccomment">//! assert!(0 <= j && j < 10);</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Propagating panics:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::sync::mpsc::channel;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // The call to recv() will return an error because the channel has already</span>
<span class="doccomment">//! // hung up (or been deallocated)</span>
<span class="doccomment">//! let (tx, rx) = channel::<i32>();</span>
<span class="doccomment">//! drop(tx);</span>
<span class="doccomment">//! assert!(rx.recv().is_err());</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Synchronous channels:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::thread;</span>
<span class="doccomment">//! use std::sync::mpsc::sync_channel;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let (tx, rx) = sync_channel::<i32>(0);</span>
<span class="doccomment">//! thread::spawn(move|| {</span>
<span class="doccomment">//! // This will wait for the parent thread to start receiving</span>
<span class="doccomment">//! tx.send(53).unwrap();</span>
<span class="doccomment">//! });</span>
<span class="doccomment">//! rx.recv().unwrap();</span>
<span class="doccomment">//! ```</span>
<span class="attribute">#![<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="comment">// A description of how Rust's channel implementation works</span>
<span class="comment">//</span>
<span class="comment">// Channels are supposed to be the basic building block for all other</span>
<span class="comment">// concurrent primitives that are used in Rust. As a result, the channel type</span>
<span class="comment">// needs to be highly optimized, flexible, and broad enough for use everywhere.</span>
<span class="comment">//</span>
<span class="comment">// The choice of implementation of all channels is to be built on lock-free data</span>
<span class="comment">// structures. The channels themselves are then consequently also lock-free data</span>
<span class="comment">// structures. As always with lock-free code, this is a very "here be dragons"</span>
<span class="comment">// territory, especially because I'm unaware of any academic papers that have</span>
<span class="comment">// gone into great length about channels of these flavors.</span>
<span class="comment">//</span>
<span class="comment">// ## Flavors of channels</span>
<span class="comment">//</span>
<span class="comment">// From the perspective of a consumer of this library, there is only one flavor</span>
<span class="comment">// of channel. This channel can be used as a stream and cloned to allow multiple</span>
<span class="comment">// senders. Under the hood, however, there are actually three flavors of</span>
<span class="comment">// channels in play.</span>
<span class="comment">//</span>
<span class="comment">// * Flavor::Oneshots - these channels are highly optimized for the one-send use</span>
<span class="comment">// case. They contain as few atomics as possible and</span>
<span class="comment">// involve one and exactly one allocation.</span>
<span class="comment">// * Streams - these channels are optimized for the non-shared use case. They</span>
<span class="comment">// use a different concurrent queue that is more tailored for this</span>
<span class="comment">// use case. The initial allocation of this flavor of channel is not</span>
<span class="comment">// optimized.</span>
<span class="comment">// * Shared - this is the most general form of channel that this module offers,</span>
<span class="comment">// a channel with multiple senders. This type is as optimized as it</span>
<span class="comment">// can be, but the previous two types mentioned are much faster for</span>
<span class="comment">// their use-cases.</span>
<span class="comment">//</span>
<span class="comment">// ## Concurrent queues</span>
<span class="comment">//</span>
<span class="comment">// The basic idea of Rust's Sender/Receiver types is that send() never blocks,</span>
<span class="comment">// but recv() obviously blocks. This means that under the hood there must be</span>
<span class="comment">// some shared and concurrent queue holding all of the actual data.</span>
<span class="comment">//</span>
<span class="comment">// With two flavors of channels, two flavors of queues are also used. We have</span>
<span class="comment">// chosen to use queues from a well-known author that are abbreviated as SPSC</span>
<span class="comment">// and MPSC (single producer, single consumer and multiple producer, single</span>
<span class="comment">// consumer). SPSC queues are used for streams while MPSC queues are used for</span>
<span class="comment">// shared channels.</span>
<span class="comment">//</span>
<span class="comment">// ### SPSC optimizations</span>
<span class="comment">//</span>
<span class="comment">// The SPSC queue found online is essentially a linked list of nodes where one</span>
<span class="comment">// half of the nodes are the "queue of data" and the other half of nodes are a</span>
<span class="comment">// cache of unused nodes. The unused nodes are used such that an allocation is</span>
<span class="comment">// not required on every push() and a free doesn't need to happen on every</span>
<span class="comment">// pop().</span>
<span class="comment">//</span>
<span class="comment">// As found online, however, the cache of nodes is of an infinite size. This</span>
<span class="comment">// means that if a channel at one point in its life had 50k items in the queue,</span>
<span class="comment">// then the queue will always have the capacity for 50k items. I believed that</span>
<span class="comment">// this was an unnecessary limitation of the implementation, so I have altered</span>
<span class="comment">// the queue to optionally have a bound on the cache size.</span>
<span class="comment">//</span>
<span class="comment">// By default, streams will have an unbounded SPSC queue with a small-ish cache</span>
<span class="comment">// size. The hope is that the cache is still large enough to have very fast</span>
<span class="comment">// send() operations while not too large such that millions of channels can</span>
<span class="comment">// coexist at once.</span>
<span class="comment">//</span>
<span class="comment">// ### MPSC optimizations</span>
<span class="comment">//</span>
<span class="comment">// Right now the MPSC queue has not been optimized. Like the SPSC queue, it uses</span>
<span class="comment">// a linked list under the hood to earn its unboundedness, but I have not put</span>
<span class="comment">// forth much effort into having a cache of nodes similar to the SPSC queue.</span>
<span class="comment">//</span>
<span class="comment">// For now, I believe that this is "ok" because shared channels are not the most</span>
<span class="comment">// common type, but soon we may wish to revisit this queue choice and determine</span>
<span class="comment">// another candidate for backend storage of shared channels.</span>
<span class="comment">//</span>
<span class="comment">// ## Overview of the Implementation</span>
<span class="comment">//</span>
<span class="comment">// Now that there's a little background on the concurrent queues used, it's</span>
<span class="comment">// worth going into much more detail about the channels themselves. The basic</span>
<span class="comment">// pseudocode for a send/recv are:</span>
<span class="comment">//</span>
<span class="comment">//</span>
<span class="comment">// send(t) recv()</span>
<span class="comment">// queue.push(t) return if queue.pop()</span>
<span class="comment">// if increment() == -1 deschedule {</span>
<span class="comment">// wakeup() if decrement() > 0</span>
<span class="comment">// cancel_deschedule()</span>
<span class="comment">// }</span>
<span class="comment">// queue.pop()</span>
<span class="comment">//</span>
<span class="comment">// As mentioned before, there are no locks in this implementation, only atomic</span>
<span class="comment">// instructions are used.</span>
<span class="comment">//</span>
<span class="comment">// ### The internal atomic counter</span>
<span class="comment">//</span>
<span class="comment">// Every channel has a shared counter with each half to keep track of the size</span>
<span class="comment">// of the queue. This counter is used to abort descheduling by the receiver and</span>
<span class="comment">// to know when to wake up on the sending side.</span>
<span class="comment">//</span>
<span class="comment">// As seen in the pseudocode, senders will increment this count and receivers</span>
<span class="comment">// will decrement the count. The theory behind this is that if a sender sees a</span>
<span class="comment">// -1 count, it will wake up the receiver, and if the receiver sees a 1+ count,</span>
<span class="comment">// then it doesn't need to block.</span>
<span class="comment">//</span>
<span class="comment">// The recv() method has a beginning call to pop(), and if successful, it needs</span>
<span class="comment">// to decrement the count. It is a crucial implementation detail that this</span>
<span class="comment">// decrement does *not* happen to the shared counter. If this were the case,</span>
<span class="comment">// then it would be possible for the counter to be very negative when there were</span>
<span class="comment">// no receivers waiting, in which case the senders would have to determine when</span>
<span class="comment">// it was actually appropriate to wake up a receiver.</span>
<span class="comment">//</span>
<span class="comment">// Instead, the "steal count" is kept track of separately (not atomically</span>
<span class="comment">// because it's only used by receivers), and then the decrement() call when</span>
<span class="comment">// descheduling will lump in all of the recent steals into one large decrement.</span>
<span class="comment">//</span>
<span class="comment">// The implication of this is that if a sender sees a -1 count, then there's</span>
<span class="comment">// guaranteed to be a waiter waiting!</span>
<span class="comment">//</span>
<span class="comment">// ## Native Implementation</span>
<span class="comment">//</span>
<span class="comment">// A major goal of these channels is to work seamlessly on and off the runtime.</span>
<span class="comment">// All of the previous race conditions have been worded in terms of</span>
<span class="comment">// scheduler-isms (which is obviously not available without the runtime).</span>
<span class="comment">//</span>
<span class="comment">// For now, native usage of channels (off the runtime) will fall back onto</span>
<span class="comment">// mutexes/cond vars for descheduling/atomic decisions. The no-contention path</span>
<span class="comment">// is still entirely lock-free, the "deschedule" blocks above are surrounded by</span>
<span class="comment">// a mutex and the "wakeup" blocks involve grabbing a mutex and signaling on a</span>
<span class="comment">// condition variable.</span>
<span class="comment">//</span>
<span class="comment">// ## Select</span>
<span class="comment">//</span>
<span class="comment">// Being able to support selection over channels has greatly influenced this</span>
<span class="comment">// design, and not only does selection need to work inside the runtime, but also</span>
<span class="comment">// outside the runtime.</span>
<span class="comment">//</span>
<span class="comment">// The implementation is fairly straightforward. The goal of select() is not to</span>
<span class="comment">// return some data, but only to return which channel can receive data without</span>
<span class="comment">// blocking. The implementation is essentially the entire blocking procedure</span>
<span class="comment">// followed by an increment as soon as its woken up. The cancellation procedure</span>
<span class="comment">// involves an increment and swapping out of to_wake to acquire ownership of the</span>
<span class="comment">// thread to unblock.</span>
<span class="comment">//</span>
<span class="comment">// Sadly this current implementation requires multiple allocations, so I have</span>
<span class="comment">// seen the throughput of select() be much worse than it should be. I do not</span>
<span class="comment">// believe that there is anything fundamental that needs to change about these</span>
<span class="comment">// channels, however, in order to support a more efficient select().</span>
<span class="comment">//</span>
<span class="comment">// # Conclusion</span>
<span class="comment">//</span>
<span class="comment">// And now that you've seen all the races that I found and attempted to fix,</span>
<span class="comment">// here's the code for you to find some more!</span>
<span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">Arc</span>;
<span class="kw">use</span> <span class="ident">error</span>;
<span class="kw">use</span> <span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">cell</span>::<span class="ident">UnsafeCell</span>;
<span class="kw">use</span> <span class="ident">time</span>::{<span class="ident">Duration</span>, <span class="ident">Instant</span>};
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mpsc_select"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27800"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">select</span>::{<span class="ident">Select</span>, <span class="ident">Handle</span>};
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">select</span>::<span class="ident">StartResult</span>;
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">select</span>::<span class="ident">StartResult</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">blocking</span>::<span class="ident">SignalToken</span>;
<span class="kw">mod</span> <span class="ident">blocking</span>;
<span class="kw">mod</span> <span class="ident">oneshot</span>;
<span class="kw">mod</span> <span class="ident">select</span>;
<span class="kw">mod</span> <span class="ident">shared</span>;
<span class="kw">mod</span> <span class="ident">stream</span>;
<span class="kw">mod</span> <span class="ident">sync</span>;
<span class="kw">mod</span> <span class="ident">mpsc_queue</span>;
<span class="kw">mod</span> <span class="ident">spsc_queue</span>;
<span class="kw">mod</span> <span class="ident">cache_aligned</span>;
<span class="doccomment">/// The receiving half of Rust's [`channel`][] (or [`sync_channel`]) type.</span>
<span class="doccomment">/// This half can only be owned by one thread.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Messages sent to the channel can be retrieved using [`recv`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`channel`]: fn.channel.html</span>
<span class="doccomment">/// [`sync_channel`]: fn.sync_channel.html</span>
<span class="doccomment">/// [`recv`]: struct.Receiver.html#method.recv</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::sync::mpsc::channel;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (send, recv) = channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// send.send("Hello world!").unwrap();</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(2)); // block for two seconds</span>
<span class="doccomment">/// send.send("Delayed for 2 seconds").unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("{}", recv.recv().unwrap()); // Received immediately</span>
<span class="doccomment">/// println!("Waiting...");</span>
<span class="doccomment">/// println!("{}", recv.recv().unwrap()); // Received after 2 seconds</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">Flavor</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>,
}
<span class="comment">// The receiver port can be sent from place to place, so long as it</span>
<span class="comment">// is not used to receive non-sendable things.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { }
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="op">!</span><span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { }
<span class="doccomment">/// An iterator over messages on a [`Receiver`], created by [`iter`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This iterator will block whenever [`next`] is called,</span>
<span class="doccomment">/// waiting for a new message, and [`None`] will be returned</span>
<span class="doccomment">/// when the corresponding channel has hung up.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`iter`]: struct.Receiver.html#method.iter</span>
<span class="doccomment">/// [`Receiver`]: struct.Receiver.html</span>
<span class="doccomment">/// [`next`]: ../../../std/iter/trait.Iterator.html#tymethod.next</span>
<span class="doccomment">/// [`None`]: ../../../std/option/enum.Option.html#variant.None</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::sync::mpsc::channel;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (send, recv) = channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// send.send(1u8).unwrap();</span>
<span class="doccomment">/// send.send(2u8).unwrap();</span>
<span class="doccomment">/// send.send(3u8).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// for x in recv.iter() {</span>
<span class="doccomment">/// println!("Got: {}", x);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">rx</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
}
<span class="doccomment">/// An iterator that attempts to yield all pending values for a [`Receiver`],</span>
<span class="doccomment">/// created by [`try_iter`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`None`] will be returned when there are no pending values remaining or</span>
<span class="doccomment">/// if the corresponding channel has hung up.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This iterator will never block the caller in order to wait for data to</span>
<span class="doccomment">/// become available. Instead, it will return [`None`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Receiver`]: struct.Receiver.html</span>
<span class="doccomment">/// [`try_iter`]: struct.Receiver.html#method.try_iter</span>
<span class="doccomment">/// [`None`]: ../../../std/option/enum.Option.html#variant.None</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::sync::mpsc::channel;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (sender, receiver) = channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Nothing is in the buffer yet</span>
<span class="doccomment">/// assert!(receiver.try_iter().next().is_none());</span>
<span class="doccomment">/// println!("Nothing in the buffer...");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// sender.send(1).unwrap();</span>
<span class="doccomment">/// sender.send(2).unwrap();</span>
<span class="doccomment">/// sender.send(3).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("Going to sleep...");</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(2)); // block for two seconds</span>
<span class="doccomment">///</span>
<span class="doccomment">/// for x in receiver.try_iter() {</span>
<span class="doccomment">/// println!("Got: {}", x);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"receiver_try_iter"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">TryIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">rx</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
}
<span class="doccomment">/// An owning iterator over messages on a [`Receiver`],</span>
<span class="doccomment">/// created by **Receiver::into_iter**.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This iterator will block whenever [`next`]</span>
<span class="doccomment">/// is called, waiting for a new message, and [`None`] will be</span>
<span class="doccomment">/// returned if the corresponding channel has hung up.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Receiver`]: struct.Receiver.html</span>
<span class="doccomment">/// [`next`]: ../../../std/iter/trait.Iterator.html#tymethod.next</span>
<span class="doccomment">/// [`None`]: ../../../std/option/enum.Option.html#variant.None</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::sync::mpsc::channel;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (send, recv) = channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// send.send(1u8).unwrap();</span>
<span class="doccomment">/// send.send(2u8).unwrap();</span>
<span class="doccomment">/// send.send(3u8).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// for x in recv.into_iter() {</span>
<span class="doccomment">/// println!("Got: {}", x);</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"receiver_into_iter"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.1.0"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">rx</span>: <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>
}
<span class="doccomment">/// The sending-half of Rust's asynchronous [`channel`] type. This half can only be</span>
<span class="doccomment">/// owned by one thread, but it can be cloned to send to other threads.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Messages can be sent through this channel with [`send`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`channel`]: fn.channel.html</span>
<span class="doccomment">/// [`send`]: struct.Sender.html#method.send</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::sync::mpsc::channel;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (sender, receiver) = channel();</span>
<span class="doccomment">/// let sender2 = sender.clone();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // First thread owns sender</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// sender.send(1).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Second thread owns sender2</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// sender2.send(2).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let msg = receiver.recv().unwrap();</span>
<span class="doccomment">/// let msg2 = receiver.recv().unwrap();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(3, msg + msg2);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">Flavor</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>,
}
<span class="comment">// The send port can be sent from place to place, so long as it</span>
<span class="comment">// is not used to send non-sendable things.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { }
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="op">!</span><span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { }
<span class="doccomment">/// The sending-half of Rust's synchronous [`sync_channel`] type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Messages can be sent through this channel with [`send`] or [`try_send`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`send`] will block if there is no space in the internal buffer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`sync_channel`]: fn.sync_channel.html</span>
<span class="doccomment">/// [`send`]: struct.SyncSender.html#method.send</span>
<span class="doccomment">/// [`try_send`]: struct.SyncSender.html#method.try_send</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::sync::mpsc::sync_channel;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Create a sync_channel with buffer size 2</span>
<span class="doccomment">/// let (sync_sender, receiver) = sync_channel(2);</span>
<span class="doccomment">/// let sync_sender2 = sync_sender.clone();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // First thread owns sync_sender</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// sync_sender.send(1).unwrap();</span>
<span class="doccomment">/// sync_sender.send(2).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Second thread owns sync_sender2</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// sync_sender2.send(3).unwrap();</span>
<span class="doccomment">/// // thread will now block since the buffer is full</span>
<span class="doccomment">/// println!("Thread unblocked!");</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut msg;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// msg = receiver.recv().unwrap();</span>
<span class="doccomment">/// println!("message {} received", msg);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // "Thread unblocked!" will be printed now</span>
<span class="doccomment">///</span>
<span class="doccomment">/// msg = receiver.recv().unwrap();</span>
<span class="doccomment">/// println!("message {} received", msg);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// msg = receiver.recv().unwrap();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("message {} received", msg);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SyncSender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">Arc</span><span class="op"><</span><span class="ident">sync</span>::<span class="ident">Packet</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>,
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">SyncSender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="doccomment">/// An error returned from the [`Sender::send`] or [`SyncSender::send`]</span>
<span class="doccomment">/// function on **channel**s.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A **send** operation can only fail if the receiving end of a channel is</span>
<span class="doccomment">/// disconnected, implying that the data could never be received. The error</span>
<span class="doccomment">/// contains the data being sent as a payload so it can be recovered.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Sender::send`]: struct.Sender.html#method.send</span>
<span class="doccomment">/// [`SyncSender::send`]: struct.SyncSender.html#method.send</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Clone</span>, <span class="ident">Copy</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SendError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="kw">pub</span> <span class="ident">T</span>);
<span class="doccomment">/// An error returned from the [`recv`] function on a [`Receiver`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The [`recv`] operation can only fail if the sending half of a</span>
<span class="doccomment">/// [`channel`][`channel`] (or [`sync_channel`]) is disconnected, implying that no further</span>
<span class="doccomment">/// messages will ever be received.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`recv`]: struct.Receiver.html#method.recv</span>
<span class="doccomment">/// [`Receiver`]: struct.Receiver.html</span>
<span class="doccomment">/// [`channel`]: fn.channel.html</span>
<span class="doccomment">/// [`sync_channel`]: fn.sync_channel.html</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RecvError</span>;
<span class="doccomment">/// This enumeration is the list of the possible reasons that [`try_recv`] could</span>
<span class="doccomment">/// not return data when called. This can occur with both a [`channel`] and</span>
<span class="doccomment">/// a [`sync_channel`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`try_recv`]: struct.Receiver.html#method.try_recv</span>
<span class="doccomment">/// [`channel`]: fn.channel.html</span>
<span class="doccomment">/// [`sync_channel`]: fn.sync_channel.html</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">TryRecvError</span> {
<span class="doccomment">/// This **channel** is currently empty, but the **Sender**(s) have not yet</span>
<span class="doccomment">/// disconnected, so data may yet become available.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="ident">Empty</span>,
<span class="doccomment">/// The **channel**'s sending half has become disconnected, and there will</span>
<span class="doccomment">/// never be any more data received on it.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="ident">Disconnected</span>,
}
<span class="doccomment">/// This enumeration is the list of possible errors that made [`recv_timeout`]</span>
<span class="doccomment">/// unable to return data when called. This can occur with both a [`channel`] and</span>
<span class="doccomment">/// a [`sync_channel`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`recv_timeout`]: struct.Receiver.html#method.recv_timeout</span>
<span class="doccomment">/// [`channel`]: fn.channel.html</span>
<span class="doccomment">/// [`sync_channel`]: fn.sync_channel.html</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mpsc_recv_timeout"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">RecvTimeoutError</span> {
<span class="doccomment">/// This **channel** is currently empty, but the **Sender**(s) have not yet</span>
<span class="doccomment">/// disconnected, so data may yet become available.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mpsc_recv_timeout"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span>
<span class="ident">Timeout</span>,
<span class="doccomment">/// The **channel**'s sending half has become disconnected, and there will</span>
<span class="doccomment">/// never be any more data received on it.</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mpsc_recv_timeout"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span>
<span class="ident">Disconnected</span>,
}
<span class="doccomment">/// This enumeration is the list of the possible error outcomes for the</span>
<span class="doccomment">/// [`try_send`] method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`try_send`]: struct.SyncSender.html#method.try_send</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Clone</span>, <span class="ident">Copy</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">TrySendError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// The data could not be sent on the [`sync_channel`] because it would require that</span>
<span class="doccomment">/// the callee block to send the data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If this is a buffered channel, then the buffer is full at this time. If</span>
<span class="doccomment">/// this is not a buffered channel, then there is no [`Receiver`] available to</span>
<span class="doccomment">/// acquire the data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`sync_channel`]: fn.sync_channel.html</span>
<span class="doccomment">/// [`Receiver`]: struct.Receiver.html</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="ident">Full</span>(<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="ident">T</span>),
<span class="doccomment">/// This [`sync_channel`]'s receiving half has disconnected, so the data could not be</span>
<span class="doccomment">/// sent. The data is returned back to the callee in this case.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`sync_channel`]: fn.sync_channel.html</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="ident">Disconnected</span>(<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span> <span class="ident">T</span>),
}
<span class="kw">enum</span> <span class="ident">Flavor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Oneshot</span>(<span class="ident">Arc</span><span class="op"><</span><span class="ident">oneshot</span>::<span class="ident">Packet</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>),
<span class="ident">Stream</span>(<span class="ident">Arc</span><span class="op"><</span><span class="ident">stream</span>::<span class="ident">Packet</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>),
<span class="ident">Shared</span>(<span class="ident">Arc</span><span class="op"><</span><span class="ident">shared</span>::<span class="ident">Packet</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>),
<span class="ident">Sync</span>(<span class="ident">Arc</span><span class="op"><</span><span class="ident">sync</span>::<span class="ident">Packet</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>),
}
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">trait</span> <span class="ident">UnsafeFlavor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">inner_unsafe</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">Flavor</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>;
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">inner_mut</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Flavor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="self">self</span>.<span class="ident">inner_unsafe</span>().<span class="ident">get</span>()
}
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">inner</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Flavor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw-2">&</span><span class="kw-2">*</span><span class="self">self</span>.<span class="ident">inner_unsafe</span>().<span class="ident">get</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">UnsafeFlavor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">inner_unsafe</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">Flavor</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">UnsafeFlavor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">inner_unsafe</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">UnsafeCell</span><span class="op"><</span><span class="ident">Flavor</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>
}
}
<span class="doccomment">/// Creates a new asynchronous channel, returning the sender/receiver halves.</span>
<span class="doccomment">/// All data sent on the [`Sender`] will become available on the [`Receiver`] in</span>
<span class="doccomment">/// the same order as it was sent, and no [`send`] will block the calling thread</span>
<span class="doccomment">/// (this channel has an "infinite buffer", unlike [`sync_channel`], which will</span>
<span class="doccomment">/// block after its buffer limit is reached). [`recv`] will block until a message</span>
<span class="doccomment">/// is available.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The [`Sender`] can be cloned to [`send`] to the same channel multiple times, but</span>
<span class="doccomment">/// only one [`Receiver`] is supported.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the [`Receiver`] is disconnected while trying to [`send`] with the</span>
<span class="doccomment">/// [`Sender`], the [`send`] method will return a [`SendError`]. Similarly, If the</span>
<span class="doccomment">/// [`Sender`] is disconnected while trying to [`recv`], the [`recv`] method will</span>
<span class="doccomment">/// return a [`RecvError`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`send`]: struct.Sender.html#method.send</span>
<span class="doccomment">/// [`recv`]: struct.Receiver.html#method.recv</span>
<span class="doccomment">/// [`Sender`]: struct.Sender.html</span>
<span class="doccomment">/// [`Receiver`]: struct.Receiver.html</span>
<span class="doccomment">/// [`sync_channel`]: fn.sync_channel.html</span>
<span class="doccomment">/// [`SendError`]: struct.SendError.html</span>
<span class="doccomment">/// [`RecvError`]: struct.RecvError.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::mpsc::channel;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (sender, receiver) = channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Spawn off an expensive computation</span>
<span class="doccomment">/// thread::spawn(move|| {</span>
<span class="doccomment">/// # fn expensive_computation() {}</span>
<span class="doccomment">/// sender.send(expensive_computation()).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Do some useful work for awhile</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Let's see what that answer was</span>
<span class="doccomment">/// println!("{:?}", receiver.recv().unwrap());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">channel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">-></span> (<span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) {
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">oneshot</span>::<span class="ident">Packet</span>::<span class="ident">new</span>());
(<span class="ident">Sender</span>::<span class="ident">new</span>(<span class="ident">Flavor</span>::<span class="ident">Oneshot</span>(<span class="ident">a</span>.<span class="ident">clone</span>())), <span class="ident">Receiver</span>::<span class="ident">new</span>(<span class="ident">Flavor</span>::<span class="ident">Oneshot</span>(<span class="ident">a</span>)))
}
<span class="doccomment">/// Creates a new synchronous, bounded channel.</span>
<span class="doccomment">/// All data sent on the [`SyncSender`] will become available on the [`Receiver`]</span>
<span class="doccomment">/// in the same order as it was sent. Like asynchronous [`channel`]s, the</span>
<span class="doccomment">/// [`Receiver`] will block until a message becomes available. `sync_channel`</span>
<span class="doccomment">/// differs greatly in the semantics of the sender, however.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This channel has an internal buffer on which messages will be queued.</span>
<span class="doccomment">/// `bound` specifies the buffer size. When the internal buffer becomes full,</span>
<span class="doccomment">/// future sends will *block* waiting for the buffer to open up. Note that a</span>
<span class="doccomment">/// buffer size of 0 is valid, in which case this becomes "rendezvous channel"</span>
<span class="doccomment">/// where each [`send`] will not return until a [`recv`] is paired with it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The [`SyncSender`] can be cloned to [`send`] to the same channel multiple</span>
<span class="doccomment">/// times, but only one [`Receiver`] is supported.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Like asynchronous channels, if the [`Receiver`] is disconnected while trying</span>
<span class="doccomment">/// to [`send`] with the [`SyncSender`], the [`send`] method will return a</span>
<span class="doccomment">/// [`SendError`]. Similarly, If the [`SyncSender`] is disconnected while trying</span>
<span class="doccomment">/// to [`recv`], the [`recv`] method will return a [`RecvError`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`channel`]: fn.channel.html</span>
<span class="doccomment">/// [`send`]: struct.SyncSender.html#method.send</span>
<span class="doccomment">/// [`recv`]: struct.Receiver.html#method.recv</span>
<span class="doccomment">/// [`SyncSender`]: struct.SyncSender.html</span>
<span class="doccomment">/// [`Receiver`]: struct.Receiver.html</span>
<span class="doccomment">/// [`SendError`]: struct.SendError.html</span>
<span class="doccomment">/// [`RecvError`]: struct.RecvError.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::mpsc::sync_channel;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (sender, receiver) = sync_channel(1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // this returns immediately</span>
<span class="doccomment">/// sender.send(1).unwrap();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move|| {</span>
<span class="doccomment">/// // this will block until the previous message has been received</span>
<span class="doccomment">/// sender.send(2).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(receiver.recv().unwrap(), 1);</span>
<span class="doccomment">/// assert_eq!(receiver.recv().unwrap(), 2);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">sync_channel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">bound</span>: <span class="ident">usize</span>) <span class="op">-></span> (<span class="ident">SyncSender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) {
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">sync</span>::<span class="ident">Packet</span>::<span class="ident">new</span>(<span class="ident">bound</span>));
(<span class="ident">SyncSender</span>::<span class="ident">new</span>(<span class="ident">a</span>.<span class="ident">clone</span>()), <span class="ident">Receiver</span>::<span class="ident">new</span>(<span class="ident">Flavor</span>::<span class="ident">Sync</span>(<span class="ident">a</span>)))
}
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="comment">// Sender</span>
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">inner</span>: <span class="ident">Flavor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Sender</span> {
<span class="ident">inner</span>: <span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="ident">inner</span>),
}
}
<span class="doccomment">/// Attempts to send a value on this channel, returning it back if it could</span>
<span class="doccomment">/// not be sent.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A successful send occurs when it is determined that the other end of</span>
<span class="doccomment">/// the channel has not hung up already. An unsuccessful send would be one</span>
<span class="doccomment">/// where the corresponding receiver has already been deallocated. Note</span>
<span class="doccomment">/// that a return value of [`Err`] means that the data will never be</span>
<span class="doccomment">/// received, but a return value of [`Ok`] does *not* mean that the data</span>
<span class="doccomment">/// will be received. It is possible for the corresponding receiver to</span>
<span class="doccomment">/// hang up immediately after this function returns [`Ok`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Err`]: ../../../std/result/enum.Result.html#variant.Err</span>
<span class="doccomment">/// [`Ok`]: ../../../std/result/enum.Result.html#variant.Ok</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will never block the current thread.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::mpsc::channel;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (tx, rx) = channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // This send is always successful</span>
<span class="doccomment">/// tx.send(1).unwrap();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // This send will fail because the receiver is gone</span>
<span class="doccomment">/// drop(rx);</span>
<span class="doccomment">/// assert_eq!(tx.send(1).unwrap_err().0, 1);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">send</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">t</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">SendError</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> {
<span class="kw">let</span> (<span class="ident">new_inner</span>, <span class="ident">ret</span>) <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">inner</span>() } {
<span class="ident">Flavor</span>::<span class="ident">Oneshot</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">if</span> <span class="op">!</span><span class="ident">p</span>.<span class="ident">sent</span>() {
<span class="kw">return</span> <span class="ident">p</span>.<span class="ident">send</span>(<span class="ident">t</span>).<span class="ident">map_err</span>(<span class="ident">SendError</span>);
} <span class="kw">else</span> {
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">stream</span>::<span class="ident">Packet</span>::<span class="ident">new</span>());
<span class="kw">let</span> <span class="ident">rx</span> <span class="op">=</span> <span class="ident">Receiver</span>::<span class="ident">new</span>(<span class="ident">Flavor</span>::<span class="ident">Stream</span>(<span class="ident">a</span>.<span class="ident">clone</span>()));
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">upgrade</span>(<span class="ident">rx</span>) {
<span class="ident">oneshot</span>::<span class="ident">UpSuccess</span> <span class="op">=></span> {
<span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">send</span>(<span class="ident">t</span>);
(<span class="ident">a</span>, <span class="ident">ret</span>)
}
<span class="ident">oneshot</span>::<span class="ident">UpDisconnected</span> <span class="op">=></span> (<span class="ident">a</span>, <span class="prelude-val">Err</span>(<span class="ident">t</span>)),
<span class="ident">oneshot</span>::<span class="ident">UpWoke</span>(<span class="ident">token</span>) <span class="op">=></span> {
<span class="comment">// This send cannot panic because the thread is</span>
<span class="comment">// asleep (we're looking at it), so the receiver</span>
<span class="comment">// can't go away.</span>
<span class="ident">a</span>.<span class="ident">send</span>(<span class="ident">t</span>).<span class="ident">ok</span>().<span class="ident">unwrap</span>();
<span class="ident">token</span>.<span class="ident">signal</span>();
(<span class="ident">a</span>, <span class="prelude-val">Ok</span>(()))
}
}
}
}
<span class="ident">Flavor</span>::<span class="ident">Stream</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">p</span>.<span class="ident">send</span>(<span class="ident">t</span>).<span class="ident">map_err</span>(<span class="ident">SendError</span>),
<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">p</span>.<span class="ident">send</span>(<span class="ident">t</span>).<span class="ident">map_err</span>(<span class="ident">SendError</span>),
<span class="ident">Flavor</span>::<span class="ident">Sync</span>(..) <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(),
};
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> <span class="ident">Sender</span>::<span class="ident">new</span>(<span class="ident">Flavor</span>::<span class="ident">Stream</span>(<span class="ident">new_inner</span>));
<span class="ident">mem</span>::<span class="ident">swap</span>(<span class="self">self</span>.<span class="ident">inner_mut</span>(), <span class="ident">tmp</span>.<span class="ident">inner_mut</span>());
}
<span class="ident">ret</span>.<span class="ident">map_err</span>(<span class="ident">SendError</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">packet</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">inner</span>() } {
<span class="ident">Flavor</span>::<span class="ident">Oneshot</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">shared</span>::<span class="ident">Packet</span>::<span class="ident">new</span>());
{
<span class="kw">let</span> <span class="ident">guard</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">postinit_lock</span>();
<span class="kw">let</span> <span class="ident">rx</span> <span class="op">=</span> <span class="ident">Receiver</span>::<span class="ident">new</span>(<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="ident">a</span>.<span class="ident">clone</span>()));
<span class="kw">let</span> <span class="ident">sleeper</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">p</span>.<span class="ident">upgrade</span>(<span class="ident">rx</span>) {
<span class="ident">oneshot</span>::<span class="ident">UpSuccess</span> <span class="op">|</span>
<span class="ident">oneshot</span>::<span class="ident">UpDisconnected</span> <span class="op">=></span> <span class="prelude-val">None</span>,
<span class="ident">oneshot</span>::<span class="ident">UpWoke</span>(<span class="ident">task</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">task</span>),
};
<span class="ident">a</span>.<span class="ident">inherit_blocker</span>(<span class="ident">sleeper</span>, <span class="ident">guard</span>);
}
<span class="ident">a</span>
}
<span class="ident">Flavor</span>::<span class="ident">Stream</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">shared</span>::<span class="ident">Packet</span>::<span class="ident">new</span>());
{
<span class="kw">let</span> <span class="ident">guard</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">postinit_lock</span>();
<span class="kw">let</span> <span class="ident">rx</span> <span class="op">=</span> <span class="ident">Receiver</span>::<span class="ident">new</span>(<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="ident">a</span>.<span class="ident">clone</span>()));
<span class="kw">let</span> <span class="ident">sleeper</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">p</span>.<span class="ident">upgrade</span>(<span class="ident">rx</span>) {
<span class="ident">stream</span>::<span class="ident">UpSuccess</span> <span class="op">|</span>
<span class="ident">stream</span>::<span class="ident">UpDisconnected</span> <span class="op">=></span> <span class="prelude-val">None</span>,
<span class="ident">stream</span>::<span class="ident">UpWoke</span>(<span class="ident">task</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">task</span>),
};
<span class="ident">a</span>.<span class="ident">inherit_blocker</span>(<span class="ident">sleeper</span>, <span class="ident">guard</span>);
}
<span class="ident">a</span>
}
<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="ident">p</span>.<span class="ident">clone_chan</span>();
<span class="kw">return</span> <span class="ident">Sender</span>::<span class="ident">new</span>(<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="ident">p</span>.<span class="ident">clone</span>()));
}
<span class="ident">Flavor</span>::<span class="ident">Sync</span>(..) <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(),
};
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> <span class="ident">Sender</span>::<span class="ident">new</span>(<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="ident">packet</span>.<span class="ident">clone</span>()));
<span class="ident">mem</span>::<span class="ident">swap</span>(<span class="self">self</span>.<span class="ident">inner_mut</span>(), <span class="ident">tmp</span>.<span class="ident">inner_mut</span>());
}
<span class="ident">Sender</span>::<span class="ident">new</span>(<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="ident">packet</span>))
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">match</span> <span class="kw-2">*</span><span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">inner</span>() } {
<span class="ident">Flavor</span>::<span class="ident">Oneshot</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="ident">p</span>.<span class="ident">drop_chan</span>(),
<span class="ident">Flavor</span>::<span class="ident">Stream</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="ident">p</span>.<span class="ident">drop_chan</span>(),
<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="ident">p</span>.<span class="ident">drop_chan</span>(),
<span class="ident">Flavor</span>::<span class="ident">Sync</span>(..) <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(),
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mpsc_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.8.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Sender"</span>).<span class="ident">finish</span>()
}
}
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="comment">// SyncSender</span>
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SyncSender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">inner</span>: <span class="ident">Arc</span><span class="op"><</span><span class="ident">sync</span>::<span class="ident">Packet</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span>) <span class="op">-></span> <span class="ident">SyncSender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">SyncSender</span> { <span class="ident">inner</span>: <span class="ident">inner</span> }
}
<span class="doccomment">/// Sends a value on this synchronous channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will *block* until space in the internal buffer becomes</span>
<span class="doccomment">/// available or a receiver is available to hand off the message to.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that a successful send does *not* guarantee that the receiver will</span>
<span class="doccomment">/// ever see the data if there is a buffer on this channel. Items may be</span>
<span class="doccomment">/// enqueued in the internal buffer for the receiver to receive at a later</span>
<span class="doccomment">/// time. If the buffer size is 0, however, the channel becomes a rendezvous</span>
<span class="doccomment">/// channel and it guarantees that the receiver has indeed received</span>
<span class="doccomment">/// the data if this function returns success.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will never panic, but it may return [`Err`] if the</span>
<span class="doccomment">/// [`Receiver`] has disconnected and is no longer able to receive</span>
<span class="doccomment">/// information.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Err`]: ../../../std/result/enum.Result.html#variant.Err</span>
<span class="doccomment">/// [`Receiver`]: ../../../std/sync/mpsc/struct.Receiver.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::sync::mpsc::sync_channel;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Create a rendezvous sync_channel with buffer size 0</span>
<span class="doccomment">/// let (sync_sender, receiver) = sync_channel(0);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// println!("sending message...");</span>
<span class="doccomment">/// sync_sender.send(1).unwrap();</span>
<span class="doccomment">/// // Thread is now blocked until the message is received</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("...message received!");</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let msg = receiver.recv().unwrap();</span>
<span class="doccomment">/// assert_eq!(1, msg);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">send</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">t</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">SendError</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> {
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">send</span>(<span class="ident">t</span>).<span class="ident">map_err</span>(<span class="ident">SendError</span>)
}
<span class="doccomment">/// Attempts to send a value on this channel without blocking.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method differs from [`send`] by returning immediately if the</span>
<span class="doccomment">/// channel's buffer is full or no receiver is waiting to acquire some</span>
<span class="doccomment">/// data. Compared with [`send`], this function has two failure cases</span>
<span class="doccomment">/// instead of one (one for disconnection, one for a full buffer).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See [`send`] for notes about guarantees of whether the</span>
<span class="doccomment">/// receiver has received the data or not if this function is successful.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`send`]: ../../../std/sync/mpsc/struct.SyncSender.html#method.send</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::sync::mpsc::sync_channel;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Create a sync_channel with buffer size 1</span>
<span class="doccomment">/// let (sync_sender, receiver) = sync_channel(1);</span>
<span class="doccomment">/// let sync_sender2 = sync_sender.clone();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // First thread owns sync_sender</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// sync_sender.send(1).unwrap();</span>
<span class="doccomment">/// sync_sender.send(2).unwrap();</span>
<span class="doccomment">/// // Thread blocked</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Second thread owns sync_sender2</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// // This will return an error and send</span>
<span class="doccomment">/// // no message if the buffer is full</span>
<span class="doccomment">/// sync_sender2.try_send(3).is_err();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut msg;</span>
<span class="doccomment">/// msg = receiver.recv().unwrap();</span>
<span class="doccomment">/// println!("message {} received", msg);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// msg = receiver.recv().unwrap();</span>
<span class="doccomment">/// println!("message {} received", msg);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Third message may have never been sent</span>
<span class="doccomment">/// match receiver.try_recv() {</span>
<span class="doccomment">/// Ok(msg) => println!("message {} received", msg),</span>
<span class="doccomment">/// Err(_) => println!("the third message was never sent"),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">try_send</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">t</span>: <span class="ident">T</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">TrySendError</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> {
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">try_send</span>(<span class="ident">t</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">SyncSender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">SyncSender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">clone_chan</span>();
<span class="ident">SyncSender</span>::<span class="ident">new</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">clone</span>())
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">SyncSender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">drop_chan</span>();
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mpsc_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.8.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">SyncSender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"SyncSender"</span>).<span class="ident">finish</span>()
}
}
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="comment">// Receiver</span>
<span class="comment">////////////////////////////////////////////////////////////////////////////////</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">inner</span>: <span class="ident">Flavor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Receiver</span> { <span class="ident">inner</span>: <span class="ident">UnsafeCell</span>::<span class="ident">new</span>(<span class="ident">inner</span>) }
}
<span class="doccomment">/// Attempts to return a pending value on this receiver without blocking.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will never block the caller in order to wait for data to</span>
<span class="doccomment">/// become available. Instead, this will always return immediately with a</span>
<span class="doccomment">/// possible option of pending data on the channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is useful for a flavor of "optimistic check" before deciding to</span>
<span class="doccomment">/// block on a receiver.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Compared with [`recv`], this function has two failure cases instead of one</span>
<span class="doccomment">/// (one for disconnection, one for an empty buffer).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`recv`]: struct.Receiver.html#method.recv</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::sync::mpsc::{Receiver, channel};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (_, receiver): (_, Receiver<i32>) = channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(receiver.try_recv().is_err());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">try_recv</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">TryRecvError</span><span class="op">></span> {
<span class="kw">loop</span> {
<span class="kw">let</span> <span class="ident">new_port</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">inner</span>() } {
<span class="ident">Flavor</span>::<span class="ident">Oneshot</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">try_recv</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
<span class="prelude-val">Err</span>(<span class="ident">oneshot</span>::<span class="ident">Empty</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Empty</span>),
<span class="prelude-val">Err</span>(<span class="ident">oneshot</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span>)
}
<span class="prelude-val">Err</span>(<span class="ident">oneshot</span>::<span class="ident">Upgraded</span>(<span class="ident">rx</span>)) <span class="op">=></span> <span class="ident">rx</span>,
}
}
<span class="ident">Flavor</span>::<span class="ident">Stream</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">try_recv</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
<span class="prelude-val">Err</span>(<span class="ident">stream</span>::<span class="ident">Empty</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Empty</span>),
<span class="prelude-val">Err</span>(<span class="ident">stream</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span>)
}
<span class="prelude-val">Err</span>(<span class="ident">stream</span>::<span class="ident">Upgraded</span>(<span class="ident">rx</span>)) <span class="op">=></span> <span class="ident">rx</span>,
}
}
<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">try_recv</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
<span class="prelude-val">Err</span>(<span class="ident">shared</span>::<span class="ident">Empty</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Empty</span>),
<span class="prelude-val">Err</span>(<span class="ident">shared</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span>)
}
}
}
<span class="ident">Flavor</span>::<span class="ident">Sync</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">try_recv</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
<span class="prelude-val">Err</span>(<span class="ident">sync</span>::<span class="ident">Empty</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Empty</span>),
<span class="prelude-val">Err</span>(<span class="ident">sync</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span>)
}
}
}
};
<span class="kw">unsafe</span> {
<span class="ident">mem</span>::<span class="ident">swap</span>(<span class="self">self</span>.<span class="ident">inner_mut</span>(),
<span class="ident">new_port</span>.<span class="ident">inner_mut</span>());
}
}
}
<span class="doccomment">/// Attempts to wait for a value on this receiver, returning an error if the</span>
<span class="doccomment">/// corresponding channel has hung up.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will always block the current thread if there is no data</span>
<span class="doccomment">/// available and it's possible for more data to be sent. Once a message is</span>
<span class="doccomment">/// sent to the corresponding [`Sender`][] (or [`SyncSender`]), then this</span>
<span class="doccomment">/// receiver will wake up and return that message.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the corresponding [`Sender`] has disconnected, or it disconnects while</span>
<span class="doccomment">/// this call is blocking, this call will wake up and return [`Err`] to</span>
<span class="doccomment">/// indicate that no more messages can ever be received on this channel.</span>
<span class="doccomment">/// However, since channels are buffered, messages sent before the disconnect</span>
<span class="doccomment">/// will still be properly received.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Sender`]: struct.Sender.html</span>
<span class="doccomment">/// [`SyncSender`]: struct.SyncSender.html</span>
<span class="doccomment">/// [`Err`]: ../../../std/result/enum.Result.html#variant.Err</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::mpsc;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (send, recv) = mpsc::channel();</span>
<span class="doccomment">/// let handle = thread::spawn(move || {</span>
<span class="doccomment">/// send.send(1u8).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// handle.join().unwrap();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(Ok(1), recv.recv());</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Buffering behavior:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::mpsc;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::sync::mpsc::RecvError;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (send, recv) = mpsc::channel();</span>
<span class="doccomment">/// let handle = thread::spawn(move || {</span>
<span class="doccomment">/// send.send(1u8).unwrap();</span>
<span class="doccomment">/// send.send(2).unwrap();</span>
<span class="doccomment">/// send.send(3).unwrap();</span>
<span class="doccomment">/// drop(send);</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // wait for the thread to join so we ensure the sender is dropped</span>
<span class="doccomment">/// handle.join().unwrap();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(Ok(1), recv.recv());</span>
<span class="doccomment">/// assert_eq!(Ok(2), recv.recv());</span>
<span class="doccomment">/// assert_eq!(Ok(3), recv.recv());</span>
<span class="doccomment">/// assert_eq!(Err(RecvError), recv.recv());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">recv</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">RecvError</span><span class="op">></span> {
<span class="kw">loop</span> {
<span class="kw">let</span> <span class="ident">new_port</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">inner</span>() } {
<span class="ident">Flavor</span>::<span class="ident">Oneshot</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">recv</span>(<span class="prelude-val">None</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
<span class="prelude-val">Err</span>(<span class="ident">oneshot</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">RecvError</span>),
<span class="prelude-val">Err</span>(<span class="ident">oneshot</span>::<span class="ident">Upgraded</span>(<span class="ident">rx</span>)) <span class="op">=></span> <span class="ident">rx</span>,
<span class="prelude-val">Err</span>(<span class="ident">oneshot</span>::<span class="ident">Empty</span>) <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(),
}
}
<span class="ident">Flavor</span>::<span class="ident">Stream</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">recv</span>(<span class="prelude-val">None</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
<span class="prelude-val">Err</span>(<span class="ident">stream</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">RecvError</span>),
<span class="prelude-val">Err</span>(<span class="ident">stream</span>::<span class="ident">Upgraded</span>(<span class="ident">rx</span>)) <span class="op">=></span> <span class="ident">rx</span>,
<span class="prelude-val">Err</span>(<span class="ident">stream</span>::<span class="ident">Empty</span>) <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(),
}
}
<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">recv</span>(<span class="prelude-val">None</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
<span class="prelude-val">Err</span>(<span class="ident">shared</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">RecvError</span>),
<span class="prelude-val">Err</span>(<span class="ident">shared</span>::<span class="ident">Empty</span>) <span class="op">=></span> <span class="macro">unreachable</span><span class="macro">!</span>(),
}
}
<span class="ident">Flavor</span>::<span class="ident">Sync</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">p</span>.<span class="ident">recv</span>(<span class="prelude-val">None</span>).<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">RecvError</span>),
};
<span class="kw">unsafe</span> {
<span class="ident">mem</span>::<span class="ident">swap</span>(<span class="self">self</span>.<span class="ident">inner_mut</span>(), <span class="ident">new_port</span>.<span class="ident">inner_mut</span>());
}
}
}
<span class="doccomment">/// Attempts to wait for a value on this receiver, returning an error if the</span>
<span class="doccomment">/// corresponding channel has hung up, or if it waits more than `timeout`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will always block the current thread if there is no data</span>
<span class="doccomment">/// available and it's possible for more data to be sent. Once a message is</span>
<span class="doccomment">/// sent to the corresponding [`Sender`][] (or [`SyncSender`]), then this</span>
<span class="doccomment">/// receiver will wake up and return that message.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the corresponding [`Sender`] has disconnected, or it disconnects while</span>
<span class="doccomment">/// this call is blocking, this call will wake up and return [`Err`] to</span>
<span class="doccomment">/// indicate that no more messages can ever be received on this channel.</span>
<span class="doccomment">/// However, since channels are buffered, messages sent before the disconnect</span>
<span class="doccomment">/// will still be properly received.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Sender`]: struct.Sender.html</span>
<span class="doccomment">/// [`SyncSender`]: struct.SyncSender.html</span>
<span class="doccomment">/// [`Err`]: ../../../std/result/enum.Result.html#variant.Err</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Successfully receiving value before encountering timeout:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">/// use std::sync::mpsc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (send, recv) = mpsc::channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// send.send('a').unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// recv.recv_timeout(Duration::from_millis(400)),</span>
<span class="doccomment">/// Ok('a')</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Receiving an error upon reaching timeout:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">/// use std::sync::mpsc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (send, recv) = mpsc::channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// thread::sleep(Duration::from_millis(800));</span>
<span class="doccomment">/// send.send('a').unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// recv.recv_timeout(Duration::from_millis(400)),</span>
<span class="doccomment">/// Err(mpsc::RecvTimeoutError::Timeout)</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mpsc_recv_timeout"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.12.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">recv_timeout</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">timeout</span>: <span class="ident">Duration</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">RecvTimeoutError</span><span class="op">></span> {
<span class="comment">// Do an optimistic try_recv to avoid the performance impact of</span>
<span class="comment">// Instant::now() in the full-channel case.</span>
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">try_recv</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">result</span>)
<span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">result</span>),
<span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span>)
<span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError</span>::<span class="ident">Disconnected</span>),
<span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Empty</span>)
<span class="op">=></span> <span class="self">self</span>.<span class="ident">recv_deadline</span>(<span class="ident">Instant</span>::<span class="ident">now</span>() <span class="op">+</span> <span class="ident">timeout</span>)
}
}
<span class="doccomment">/// Attempts to wait for a value on this receiver, returning an error if the</span>
<span class="doccomment">/// corresponding channel has hung up, or if `deadline` is reached.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will always block the current thread if there is no data</span>
<span class="doccomment">/// available and it's possible for more data to be sent. Once a message is</span>
<span class="doccomment">/// sent to the corresponding [`Sender`][] (or [`SyncSender`]), then this</span>
<span class="doccomment">/// receiver will wake up and return that message.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the corresponding [`Sender`] has disconnected, or it disconnects while</span>
<span class="doccomment">/// this call is blocking, this call will wake up and return [`Err`] to</span>
<span class="doccomment">/// indicate that no more messages can ever be received on this channel.</span>
<span class="doccomment">/// However, since channels are buffered, messages sent before the disconnect</span>
<span class="doccomment">/// will still be properly received.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Sender`]: struct.Sender.html</span>
<span class="doccomment">/// [`SyncSender`]: struct.SyncSender.html</span>
<span class="doccomment">/// [`Err`]: ../../../std/result/enum.Result.html#variant.Err</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Successfully receiving value before reaching deadline:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// #![feature(deadline_api)]</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::{Duration, Instant};</span>
<span class="doccomment">/// use std::sync::mpsc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (send, recv) = mpsc::channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// send.send('a').unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// recv.recv_deadline(Instant::now() + Duration::from_millis(400)),</span>
<span class="doccomment">/// Ok('a')</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Receiving an error upon reaching deadline:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// #![feature(deadline_api)]</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::{Duration, Instant};</span>
<span class="doccomment">/// use std::sync::mpsc;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (send, recv) = mpsc::channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// thread::sleep(Duration::from_millis(800));</span>
<span class="doccomment">/// send.send('a').unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// recv.recv_deadline(Instant::now() + Duration::from_millis(400)),</span>
<span class="doccomment">/// Err(mpsc::RecvTimeoutError::Timeout)</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"deadline_api"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"46316"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">recv_deadline</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">deadline</span>: <span class="ident">Instant</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">RecvTimeoutError</span><span class="op">></span> {
<span class="kw">use</span> <span class="self">self</span>::<span class="ident">RecvTimeoutError</span>::<span class="kw-2">*</span>;
<span class="kw">loop</span> {
<span class="kw">let</span> <span class="ident">port_or_empty</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">inner</span>() } {
<span class="ident">Flavor</span>::<span class="ident">Oneshot</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">recv</span>(<span class="prelude-val">Some</span>(<span class="ident">deadline</span>)) {
<span class="prelude-val">Ok</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
<span class="prelude-val">Err</span>(<span class="ident">oneshot</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">Disconnected</span>),
<span class="prelude-val">Err</span>(<span class="ident">oneshot</span>::<span class="ident">Upgraded</span>(<span class="ident">rx</span>)) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">rx</span>),
<span class="prelude-val">Err</span>(<span class="ident">oneshot</span>::<span class="ident">Empty</span>) <span class="op">=></span> <span class="prelude-val">None</span>,
}
}
<span class="ident">Flavor</span>::<span class="ident">Stream</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">recv</span>(<span class="prelude-val">Some</span>(<span class="ident">deadline</span>)) {
<span class="prelude-val">Ok</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
<span class="prelude-val">Err</span>(<span class="ident">stream</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">Disconnected</span>),
<span class="prelude-val">Err</span>(<span class="ident">stream</span>::<span class="ident">Upgraded</span>(<span class="ident">rx</span>)) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">rx</span>),
<span class="prelude-val">Err</span>(<span class="ident">stream</span>::<span class="ident">Empty</span>) <span class="op">=></span> <span class="prelude-val">None</span>,
}
}
<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">recv</span>(<span class="prelude-val">Some</span>(<span class="ident">deadline</span>)) {
<span class="prelude-val">Ok</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
<span class="prelude-val">Err</span>(<span class="ident">shared</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">Disconnected</span>),
<span class="prelude-val">Err</span>(<span class="ident">shared</span>::<span class="ident">Empty</span>) <span class="op">=></span> <span class="prelude-val">None</span>,
}
}
<span class="ident">Flavor</span>::<span class="ident">Sync</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">recv</span>(<span class="prelude-val">Some</span>(<span class="ident">deadline</span>)) {
<span class="prelude-val">Ok</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
<span class="prelude-val">Err</span>(<span class="ident">sync</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">Disconnected</span>),
<span class="prelude-val">Err</span>(<span class="ident">sync</span>::<span class="ident">Empty</span>) <span class="op">=></span> <span class="prelude-val">None</span>,
}
}
};
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">new_port</span>) <span class="op">=</span> <span class="ident">port_or_empty</span> {
<span class="kw">unsafe</span> {
<span class="ident">mem</span>::<span class="ident">swap</span>(<span class="self">self</span>.<span class="ident">inner_mut</span>(), <span class="ident">new_port</span>.<span class="ident">inner_mut</span>());
}
}
<span class="comment">// If we're already passed the deadline, and we're here without</span>
<span class="comment">// data, return a timeout, else try again.</span>
<span class="kw">if</span> <span class="ident">Instant</span>::<span class="ident">now</span>() <span class="op">>=</span> <span class="ident">deadline</span> {
<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">Timeout</span>);
}
}
}
<span class="doccomment">/// Returns an iterator that will block waiting for messages, but never</span>
<span class="doccomment">/// [`panic!`]. It will return [`None`] when the channel has hung up.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`panic!`]: ../../../std/macro.panic.html</span>
<span class="doccomment">/// [`None`]: ../../../std/option/enum.Option.html#variant.None</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use std::sync::mpsc::channel;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (send, recv) = channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// send.send(1).unwrap();</span>
<span class="doccomment">/// send.send(2).unwrap();</span>
<span class="doccomment">/// send.send(3).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut iter = recv.iter();</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(1));</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(2));</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(3));</span>
<span class="doccomment">/// assert_eq!(iter.next(), None);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">iter</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Iter</span> { <span class="ident">rx</span>: <span class="self">self</span> }
}
<span class="doccomment">/// Returns an iterator that will attempt to yield all pending values.</span>
<span class="doccomment">/// It will return `None` if there are no more pending values or if the</span>
<span class="doccomment">/// channel has hung up. The iterator will never [`panic!`] or block the</span>
<span class="doccomment">/// user by waiting for values.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`panic!`]: ../../../std/macro.panic.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::sync::mpsc::channel;</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (sender, receiver) = channel();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // nothing is in the buffer yet</span>
<span class="doccomment">/// assert!(receiver.try_iter().next().is_none());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(1));</span>
<span class="doccomment">/// sender.send(1).unwrap();</span>
<span class="doccomment">/// sender.send(2).unwrap();</span>
<span class="doccomment">/// sender.send(3).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // nothing is in the buffer yet</span>
<span class="doccomment">/// assert!(receiver.try_iter().next().is_none());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // block for two seconds</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(2));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut iter = receiver.try_iter();</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(1));</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(2));</span>
<span class="doccomment">/// assert_eq!(iter.next(), Some(3));</span>
<span class="doccomment">/// assert_eq!(iter.next(), None);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"receiver_try_iter"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">try_iter</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">TryIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">TryIter</span> { <span class="ident">rx</span>: <span class="self">self</span> }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">select</span>::<span class="ident">Packet</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">can_recv</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">loop</span> {
<span class="kw">let</span> <span class="ident">new_port</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">inner</span>() } {
<span class="ident">Flavor</span>::<span class="ident">Oneshot</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">can_recv</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">ret</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">ret</span>,
<span class="prelude-val">Err</span>(<span class="ident">upgrade</span>) <span class="op">=></span> <span class="ident">upgrade</span>,
}
}
<span class="ident">Flavor</span>::<span class="ident">Stream</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">can_recv</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">ret</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">ret</span>,
<span class="prelude-val">Err</span>(<span class="ident">upgrade</span>) <span class="op">=></span> <span class="ident">upgrade</span>,
}
}
<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">p</span>.<span class="ident">can_recv</span>(),
<span class="ident">Flavor</span>::<span class="ident">Sync</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">p</span>.<span class="ident">can_recv</span>(),
};
<span class="kw">unsafe</span> {
<span class="ident">mem</span>::<span class="ident">swap</span>(<span class="self">self</span>.<span class="ident">inner_mut</span>(),
<span class="ident">new_port</span>.<span class="ident">inner_mut</span>());
}
}
}
<span class="kw">fn</span> <span class="ident">start_selection</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">token</span>: <span class="ident">SignalToken</span>) <span class="op">-></span> <span class="ident">StartResult</span> {
<span class="kw">loop</span> {
<span class="kw">let</span> (<span class="ident">t</span>, <span class="ident">new_port</span>) <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">inner</span>() } {
<span class="ident">Flavor</span>::<span class="ident">Oneshot</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">start_selection</span>(<span class="ident">token</span>) {
<span class="ident">oneshot</span>::<span class="ident">SelSuccess</span> <span class="op">=></span> <span class="kw">return</span> <span class="ident">Installed</span>,
<span class="ident">oneshot</span>::<span class="ident">SelCanceled</span> <span class="op">=></span> <span class="kw">return</span> <span class="ident">Abort</span>,
<span class="ident">oneshot</span>::<span class="ident">SelUpgraded</span>(<span class="ident">t</span>, <span class="ident">rx</span>) <span class="op">=></span> (<span class="ident">t</span>, <span class="ident">rx</span>),
}
}
<span class="ident">Flavor</span>::<span class="ident">Stream</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> {
<span class="kw">match</span> <span class="ident">p</span>.<span class="ident">start_selection</span>(<span class="ident">token</span>) {
<span class="ident">stream</span>::<span class="ident">SelSuccess</span> <span class="op">=></span> <span class="kw">return</span> <span class="ident">Installed</span>,
<span class="ident">stream</span>::<span class="ident">SelCanceled</span> <span class="op">=></span> <span class="kw">return</span> <span class="ident">Abort</span>,
<span class="ident">stream</span>::<span class="ident">SelUpgraded</span>(<span class="ident">t</span>, <span class="ident">rx</span>) <span class="op">=></span> (<span class="ident">t</span>, <span class="ident">rx</span>),
}
}
<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">p</span>.<span class="ident">start_selection</span>(<span class="ident">token</span>),
<span class="ident">Flavor</span>::<span class="ident">Sync</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">p</span>.<span class="ident">start_selection</span>(<span class="ident">token</span>),
};
<span class="ident">token</span> <span class="op">=</span> <span class="ident">t</span>;
<span class="kw">unsafe</span> {
<span class="ident">mem</span>::<span class="ident">swap</span>(<span class="self">self</span>.<span class="ident">inner_mut</span>(), <span class="ident">new_port</span>.<span class="ident">inner_mut</span>());
}
}
}
<span class="kw">fn</span> <span class="ident">abort_selection</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">was_upgrade</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">loop</span> {
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">*</span><span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">inner</span>() } {
<span class="ident">Flavor</span>::<span class="ident">Oneshot</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="ident">p</span>.<span class="ident">abort_selection</span>(),
<span class="ident">Flavor</span>::<span class="ident">Stream</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="ident">p</span>.<span class="ident">abort_selection</span>(<span class="ident">was_upgrade</span>),
<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">p</span>.<span class="ident">abort_selection</span>(<span class="ident">was_upgrade</span>),
<span class="ident">Flavor</span>::<span class="ident">Sync</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">p</span>.<span class="ident">abort_selection</span>(),
};
<span class="kw">let</span> <span class="ident">new_port</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">result</span> { <span class="prelude-val">Ok</span>(<span class="ident">b</span>) <span class="op">=></span> <span class="kw">return</span> <span class="ident">b</span>, <span class="prelude-val">Err</span>(<span class="ident">p</span>) <span class="op">=></span> <span class="ident">p</span> };
<span class="ident">was_upgrade</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">unsafe</span> {
<span class="ident">mem</span>::<span class="ident">swap</span>(<span class="self">self</span>.<span class="ident">inner_mut</span>(),
<span class="ident">new_port</span>.<span class="ident">inner_mut</span>());
}
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">ok</span>() }
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"receiver_try_iter"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">TryIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">rx</span>.<span class="ident">try_recv</span>().<span class="ident">ok</span>() }
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"receiver_into_iter"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.1.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">iter</span>() }
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"receiver_into_iter"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.1.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">ok</span>() }
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"receiver_into_iter"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.1.0"</span>)]</span>
<span class="kw">impl</span> <span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">IntoIter</span> { <span class="ident">rx</span>: <span class="self">self</span> }
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">match</span> <span class="kw-2">*</span><span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">inner</span>() } {
<span class="ident">Flavor</span>::<span class="ident">Oneshot</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="ident">p</span>.<span class="ident">drop_port</span>(),
<span class="ident">Flavor</span>::<span class="ident">Stream</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="ident">p</span>.<span class="ident">drop_port</span>(),
<span class="ident">Flavor</span>::<span class="ident">Shared</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="ident">p</span>.<span class="ident">drop_port</span>(),
<span class="ident">Flavor</span>::<span class="ident">Sync</span>(<span class="kw-2">ref</span> <span class="ident">p</span>) <span class="op">=></span> <span class="ident">p</span>.<span class="ident">drop_port</span>(),
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mpsc_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.8.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Receiver"</span>).<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">SendError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="string">"SendError(..)"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">SendError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="string">"sending on a closed channel"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">SendError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> {
<span class="string">"sending on a closed channel"</span>
}
<span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">error</span>::<span class="ident">Error</span><span class="op">></span> {
<span class="prelude-val">None</span>
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">TrySendError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">TrySendError</span>::<span class="ident">Full</span>(..) <span class="op">=></span> <span class="string">"Full(..)"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>),
<span class="ident">TrySendError</span>::<span class="ident">Disconnected</span>(..) <span class="op">=></span> <span class="string">"Disconnected(..)"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>),
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">TrySendError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">TrySendError</span>::<span class="ident">Full</span>(..) <span class="op">=></span> {
<span class="string">"sending on a full channel"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
<span class="ident">TrySendError</span>::<span class="ident">Disconnected</span>(..) <span class="op">=></span> {
<span class="string">"sending on a closed channel"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">TrySendError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">TrySendError</span>::<span class="ident">Full</span>(..) <span class="op">=></span> {
<span class="string">"sending on a full channel"</span>
}
<span class="ident">TrySendError</span>::<span class="ident">Disconnected</span>(..) <span class="op">=></span> {
<span class="string">"sending on a closed channel"</span>
}
}
}
<span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">error</span>::<span class="ident">Error</span><span class="op">></span> {
<span class="prelude-val">None</span>
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mpsc_error_conversions"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">SendError</span><span class="op"><</span><span class="ident">T</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">TrySendError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">SendError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) <span class="op">-></span> <span class="ident">TrySendError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">match</span> <span class="ident">err</span> {
<span class="ident">SendError</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="ident">TrySendError</span>::<span class="ident">Disconnected</span>(<span class="ident">t</span>),
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">RecvError</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="string">"receiving on a closed channel"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">RecvError</span> {
<span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> {
<span class="string">"receiving on a closed channel"</span>
}
<span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">error</span>::<span class="ident">Error</span><span class="op">></span> {
<span class="prelude-val">None</span>
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">TryRecvError</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">TryRecvError</span>::<span class="ident">Empty</span> <span class="op">=></span> {
<span class="string">"receiving on an empty channel"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span> <span class="op">=></span> {
<span class="string">"receiving on a closed channel"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">TryRecvError</span> {
<span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">TryRecvError</span>::<span class="ident">Empty</span> <span class="op">=></span> {
<span class="string">"receiving on an empty channel"</span>
}
<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span> <span class="op">=></span> {
<span class="string">"receiving on a closed channel"</span>
}
}
}
<span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">error</span>::<span class="ident">Error</span><span class="op">></span> {
<span class="prelude-val">None</span>
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mpsc_error_conversions"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">RecvError</span><span class="op">></span> <span class="kw">for</span> <span class="ident">TryRecvError</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">RecvError</span>) <span class="op">-></span> <span class="ident">TryRecvError</span> {
<span class="kw">match</span> <span class="ident">err</span> {
<span class="ident">RecvError</span> <span class="op">=></span> <span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span>,
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mpsc_recv_timeout_error"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">RecvTimeoutError</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">RecvTimeoutError</span>::<span class="ident">Timeout</span> <span class="op">=></span> {
<span class="string">"timed out waiting on channel"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
<span class="ident">RecvTimeoutError</span>::<span class="ident">Disconnected</span> <span class="op">=></span> {
<span class="string">"channel is empty and sending half is closed"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mpsc_recv_timeout_error"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">RecvTimeoutError</span> {
<span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">RecvTimeoutError</span>::<span class="ident">Timeout</span> <span class="op">=></span> {
<span class="string">"timed out waiting on channel"</span>
}
<span class="ident">RecvTimeoutError</span>::<span class="ident">Disconnected</span> <span class="op">=></span> {
<span class="string">"channel is empty and sending half is closed"</span>
}
}
}
<span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">error</span>::<span class="ident">Error</span><span class="op">></span> {
<span class="prelude-val">None</span>
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"mpsc_error_conversions"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.24.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">RecvError</span><span class="op">></span> <span class="kw">for</span> <span class="ident">RecvTimeoutError</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">err</span>: <span class="ident">RecvError</span>) <span class="op">-></span> <span class="ident">RecvTimeoutError</span> {
<span class="kw">match</span> <span class="ident">err</span> {
<span class="ident">RecvError</span> <span class="op">=></span> <span class="ident">RecvTimeoutError</span>::<span class="ident">Disconnected</span>,
}
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">test</span>, <span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>)))]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="ident">env</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">thread</span>;
<span class="kw">use</span> <span class="ident">time</span>::{<span class="ident">Duration</span>, <span class="ident">Instant</span>};
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stress_factor</span>() <span class="op">-></span> <span class="ident">usize</span> {
<span class="kw">match</span> <span class="ident">env</span>::<span class="ident">var</span>(<span class="string">"RUST_TEST_STRESS"</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">val</span>) <span class="op">=></span> <span class="ident">val</span>.<span class="ident">parse</span>().<span class="ident">unwrap</span>(),
<span class="prelude-val">Err</span>(..) <span class="op">=></span> <span class="number">1</span>,
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">drop_full</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">_rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">isize</span><span class="op">>></span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="kw">box</span> <span class="number">1</span>).<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">drop_full_shared</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">_rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">isize</span><span class="op">>></span>();
<span class="ident">drop</span>(<span class="ident">tx</span>.<span class="ident">clone</span>());
<span class="ident">drop</span>(<span class="ident">tx</span>.<span class="ident">clone</span>());
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="kw">box</span> <span class="number">1</span>).<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke_shared</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="kw">let</span> <span class="ident">tx</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke_threads</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
});
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke_port_gone</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">drop</span>(<span class="ident">rx</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke_shared_port_gone</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">drop</span>(<span class="ident">rx</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_err</span>())
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke_shared_port_gone2</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">drop</span>(<span class="ident">rx</span>);
<span class="kw">let</span> <span class="ident">tx2</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tx2</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">port_gone_concurrent</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
});
<span class="kw">while</span> <span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_ok</span>() {}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">port_gone_concurrent_shared</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">tx2</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
});
<span class="kw">while</span> <span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_ok</span>() <span class="op">&&</span> <span class="ident">tx2</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_ok</span>() {}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke_chan_gone</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke_chan_gone_shared</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span>()<span class="op">></span>();
<span class="kw">let</span> <span class="ident">tx2</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="ident">drop</span>(<span class="ident">tx2</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">chan_gone_concurrent</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
});
<span class="kw">while</span> <span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">is_ok</span>() {}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">stress</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">10000</span> { <span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>(); }
});
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">10000</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
}
<span class="ident">t</span>.<span class="ident">join</span>().<span class="ident">ok</span>().<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">stress_shared</span>() {
<span class="kw">const</span> <span class="ident">AMT</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">10000</span>;
<span class="kw">const</span> <span class="ident">NTHREADS</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">8</span>;
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">AMT</span> <span class="op">*</span> <span class="ident">NTHREADS</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
}
<span class="kw">match</span> <span class="ident">rx</span>.<span class="ident">try_recv</span>() {
<span class="prelude-val">Ok</span>(..) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(),
<span class="kw">_</span> <span class="op">=></span> {}
}
});
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">NTHREADS</span> {
<span class="kw">let</span> <span class="ident">tx</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">AMT</span> { <span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>(); }
});
}
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="ident">t</span>.<span class="ident">join</span>().<span class="ident">ok</span>().<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">send_from_outside_runtime</span>() {
<span class="kw">let</span> (<span class="ident">tx1</span>, <span class="ident">rx1</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span>()<span class="op">></span>();
<span class="kw">let</span> (<span class="ident">tx2</span>, <span class="ident">rx2</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">t1</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx1</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">40</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx2</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
}
});
<span class="ident">rx1</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">t2</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">40</span> {
<span class="ident">tx2</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
}
});
<span class="ident">t1</span>.<span class="ident">join</span>().<span class="ident">ok</span>().<span class="ident">unwrap</span>();
<span class="ident">t2</span>.<span class="ident">join</span>().<span class="ident">ok</span>().<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">recv_from_outside_runtime</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">40</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
}
});
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">40</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
}
<span class="ident">t</span>.<span class="ident">join</span>().<span class="ident">ok</span>().<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">no_runtime</span>() {
<span class="kw">let</span> (<span class="ident">tx1</span>, <span class="ident">rx1</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> (<span class="ident">tx2</span>, <span class="ident">rx2</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">t1</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx1</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="ident">tx2</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">unwrap</span>();
});
<span class="kw">let</span> <span class="ident">t2</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx1</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx2</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">2</span>);
});
<span class="ident">t1</span>.<span class="ident">join</span>().<span class="ident">ok</span>().<span class="ident">unwrap</span>();
<span class="ident">t2</span>.<span class="ident">join</span>().<span class="ident">ok</span>().<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_close_port_first</span>() {
<span class="comment">// Simple test of closing without sending</span>
<span class="kw">let</span> (<span class="ident">_tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">drop</span>(<span class="ident">rx</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_close_chan_first</span>() {
<span class="comment">// Simple test of closing without sending</span>
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">_rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_send_port_close</span>() {
<span class="comment">// Testing that the sender cleans up the payload if receiver is closed</span>
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>();
<span class="ident">drop</span>(<span class="ident">rx</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">send</span>(<span class="kw">box</span> <span class="number">0</span>).<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_recv_chan_close</span>() {
<span class="comment">// Receiving on a closed chan will panic</span>
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
}).<span class="ident">join</span>();
<span class="comment">// What is our res?</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">res</span>.<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_send_then_recv</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="kw">box</span> <span class="number">10</span>).<span class="ident">unwrap</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="number">10</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_try_send_open</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">10</span>).<span class="ident">is_ok</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="number">10</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_try_send_closed</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">drop</span>(<span class="ident">rx</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">10</span>).<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_try_recv_open</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">10</span>).<span class="ident">unwrap</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>() <span class="op">==</span> <span class="prelude-val">Ok</span>(<span class="number">10</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_try_recv_closed</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_peek_data</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Empty</span>));
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">10</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Ok</span>(<span class="number">10</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_peek_close</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_peek_open</span>() {
<span class="kw">let</span> (<span class="ident">_tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Empty</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_multi_task_recv_then_send</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="number">10</span>);
});
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="kw">box</span> <span class="number">10</span>).<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_multi_task_recv_then_close</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">drop</span>(<span class="ident">tx</span>);
});
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="number">10</span>);
}).<span class="ident">join</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">res</span>.<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_multi_thread_close_stress</span>() {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">stress_factor</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">drop</span>(<span class="ident">rx</span>);
});
<span class="ident">drop</span>(<span class="ident">tx</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_multi_thread_send_close_stress</span>() {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">stress_factor</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">drop</span>(<span class="ident">rx</span>);
});
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
}).<span class="ident">join</span>();
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_multi_thread_recv_close_stress</span>() {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">stress_factor</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
}).<span class="ident">join</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">res</span>.<span class="ident">is_err</span>());
});
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">drop</span>(<span class="ident">tx</span>);
});
});
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_multi_thread_send_recv_stress</span>() {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">stress_factor</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">isize</span><span class="op">>></span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="kw">box</span> <span class="number">10</span>).<span class="ident">unwrap</span>();
});
<span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="number">10</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">stream_send_recv_stress</span>() {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">stress_factor</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="ident">send</span>(<span class="ident">tx</span>, <span class="number">0</span>);
<span class="ident">recv</span>(<span class="ident">rx</span>, <span class="number">0</span>);
<span class="kw">fn</span> <span class="ident">send</span>(<span class="ident">tx</span>: <span class="ident">Sender</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>, <span class="ident">i</span>: <span class="ident">i32</span>) {
<span class="kw">if</span> <span class="ident">i</span> <span class="op">==</span> <span class="number">10</span> { <span class="kw">return</span> }
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="kw">box</span> <span class="ident">i</span>).<span class="ident">unwrap</span>();
<span class="ident">send</span>(<span class="ident">tx</span>, <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>);
});
}
<span class="kw">fn</span> <span class="ident">recv</span>(<span class="ident">rx</span>: <span class="ident">Receiver</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>, <span class="ident">i</span>: <span class="ident">i32</span>) {
<span class="kw">if</span> <span class="ident">i</span> <span class="op">==</span> <span class="number">10</span> { <span class="kw">return</span> }
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="ident">i</span>);
<span class="ident">recv</span>(<span class="ident">rx</span>, <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>);
});
}
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_recv_timeout</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv_timeout</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>)), <span class="prelude-val">Ok</span>(()));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv_timeout</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>)), <span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError</span>::<span class="ident">Timeout</span>));
<span class="ident">tx</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv_timeout</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>)), <span class="prelude-val">Ok</span>(()));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">stress_recv_timeout_two_threads</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="kw">let</span> <span class="ident">stress</span> <span class="op">=</span> <span class="ident">stress_factor</span>() <span class="op">+</span> <span class="number">100</span>;
<span class="kw">let</span> <span class="ident">timeout</span> <span class="op">=</span> <span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">100</span>);
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> {
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">stress</span> {
<span class="kw">if</span> <span class="ident">i</span> <span class="op">%</span> <span class="number">2</span> <span class="op">==</span> <span class="number">0</span> {
<span class="ident">thread</span>::<span class="ident">sleep</span>(<span class="ident">timeout</span> <span class="op">*</span> <span class="number">2</span>);
}
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1usize</span>).<span class="ident">unwrap</span>();
}
});
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">recv_count</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">loop</span> {
<span class="kw">match</span> <span class="ident">rx</span>.<span class="ident">recv_timeout</span>(<span class="ident">timeout</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=></span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">n</span>, <span class="number">1usize</span>);
<span class="ident">recv_count</span> <span class="op">+=</span> <span class="number">1</span>;
}
<span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError</span>::<span class="ident">Timeout</span>) <span class="op">=></span> <span class="kw">continue</span>,
<span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> <span class="kw">break</span>,
}
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">recv_count</span>, <span class="ident">stress</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">recv_timeout_upgrade</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span>()<span class="op">></span>();
<span class="kw">let</span> <span class="ident">timeout</span> <span class="op">=</span> <span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>);
<span class="kw">let</span> <span class="ident">_tx_clone</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="kw">let</span> <span class="ident">start</span> <span class="op">=</span> <span class="ident">Instant</span>::<span class="ident">now</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv_timeout</span>(<span class="ident">timeout</span>), <span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError</span>::<span class="ident">Timeout</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">Instant</span>::<span class="ident">now</span>() <span class="op">>=</span> <span class="ident">start</span> <span class="op">+</span> <span class="ident">timeout</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">stress_recv_timeout_shared</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="kw">let</span> <span class="ident">stress</span> <span class="op">=</span> <span class="ident">stress_factor</span>() <span class="op">+</span> <span class="number">100</span>;
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">stress</span> {
<span class="kw">let</span> <span class="ident">tx</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> {
<span class="ident">thread</span>::<span class="ident">sleep</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="ident">i</span> <span class="kw">as</span> <span class="ident">u64</span> <span class="op">*</span> <span class="number">10</span>));
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1usize</span>).<span class="ident">unwrap</span>();
});
}
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">recv_count</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">loop</span> {
<span class="kw">match</span> <span class="ident">rx</span>.<span class="ident">recv_timeout</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">10</span>)) {
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=></span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">n</span>, <span class="number">1usize</span>);
<span class="ident">recv_count</span> <span class="op">+=</span> <span class="number">1</span>;
}
<span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError</span>::<span class="ident">Timeout</span>) <span class="op">=></span> <span class="kw">continue</span>,
<span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> <span class="kw">break</span>,
}
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">recv_count</span>, <span class="ident">stress</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">recv_a_lot</span>() {
<span class="comment">// Regression test that we don't run out of stack in scheduler context</span>
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">10000</span> { <span class="ident">tx</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>(); }
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">10000</span> { <span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(); }
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">shared_recv_timeout</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="kw">let</span> <span class="ident">total</span> <span class="op">=</span> <span class="number">5</span>;
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">total</span> {
<span class="kw">let</span> <span class="ident">tx</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
});
}
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">total</span> { <span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(); }
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv_timeout</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>)), <span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError</span>::<span class="ident">Timeout</span>));
<span class="ident">tx</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv_timeout</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>)), <span class="prelude-val">Ok</span>(()));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">shared_chan_stress</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="kw">let</span> <span class="ident">total</span> <span class="op">=</span> <span class="ident">stress_factor</span>() <span class="op">+</span> <span class="number">100</span>;
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">total</span> {
<span class="kw">let</span> <span class="ident">tx</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
});
}
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">total</span> {
<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_nested_recv_iter</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> (<span class="ident">total_tx</span>, <span class="ident">total_rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">acc</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">rx</span>.<span class="ident">iter</span>() {
<span class="ident">acc</span> <span class="op">+=</span> <span class="ident">x</span>;
}
<span class="ident">total_tx</span>.<span class="ident">send</span>(<span class="ident">acc</span>).<span class="ident">unwrap</span>();
});
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">3</span>).<span class="ident">unwrap</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">unwrap</span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">total_rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">6</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_recv_iter_break</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> (<span class="ident">count_tx</span>, <span class="ident">count_rx</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">count</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">rx</span>.<span class="ident">iter</span>() {
<span class="kw">if</span> <span class="ident">count</span> <span class="op">>=</span> <span class="number">3</span> {
<span class="kw">break</span>;
} <span class="kw">else</span> {
<span class="ident">count</span> <span class="op">+=</span> <span class="ident">x</span>;
}
}
<span class="ident">count_tx</span>.<span class="ident">send</span>(<span class="ident">count</span>).<span class="ident">unwrap</span>();
});
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">unwrap</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">unwrap</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">2</span>);
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">count_rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">4</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_recv_try_iter</span>() {
<span class="kw">let</span> (<span class="ident">request_tx</span>, <span class="ident">request_rx</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="kw">let</span> (<span class="ident">response_tx</span>, <span class="ident">response_rx</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="comment">// Request `x`s until we have `6`.</span>
<span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">count</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">loop</span> {
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">response_rx</span>.<span class="ident">try_iter</span>() {
<span class="ident">count</span> <span class="op">+=</span> <span class="ident">x</span>;
<span class="kw">if</span> <span class="ident">count</span> <span class="op">==</span> <span class="number">6</span> {
<span class="kw">return</span> <span class="ident">count</span>;
}
}
<span class="ident">request_tx</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
}
});
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="ident">request_rx</span>.<span class="ident">iter</span>() {
<span class="kw">if</span> <span class="ident">response_tx</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">is_err</span>() {
<span class="kw">break</span>;
}
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">t</span>.<span class="ident">join</span>().<span class="ident">unwrap</span>(), <span class="number">6</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_recv_into_iter_owned</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">unwrap</span>();
<span class="ident">rx</span>.<span class="ident">into_iter</span>()
};
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>(), <span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">is_none</span>(), <span class="bool-val">true</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_recv_into_iter_borrowed</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">unwrap</span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> (<span class="kw-2">&</span><span class="ident">rx</span>).<span class="ident">into_iter</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>(), <span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">iter</span>.<span class="ident">next</span>().<span class="ident">is_none</span>(), <span class="bool-val">true</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">try_recv_states</span>() {
<span class="kw">let</span> (<span class="ident">tx1</span>, <span class="ident">rx1</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>();
<span class="kw">let</span> (<span class="ident">tx2</span>, <span class="ident">rx2</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span>()<span class="op">></span>();
<span class="kw">let</span> (<span class="ident">tx3</span>, <span class="ident">rx3</span>) <span class="op">=</span> <span class="ident">channel</span>::<span class="op"><</span>()<span class="op">></span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">rx2</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
<span class="ident">tx1</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="ident">tx3</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
<span class="ident">rx2</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
<span class="ident">drop</span>(<span class="ident">tx1</span>);
<span class="ident">tx3</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
});
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx1</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Empty</span>));
<span class="ident">tx2</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
<span class="ident">rx3</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx1</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Ok</span>(<span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx1</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Empty</span>));
<span class="ident">tx2</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
<span class="ident">rx3</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx1</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span>));
}
<span class="comment">// This bug used to end up in a livelock inside of the Receiver destructor</span>
<span class="comment">// because the internal state of the Shared packet was corrupted</span>
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">destroy_upgraded_shared_port_when_sender_still_active</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="kw">let</span> (<span class="ident">tx2</span>, <span class="ident">rx2</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(); <span class="comment">// wait on a oneshot</span>
<span class="ident">drop</span>(<span class="ident">rx</span>); <span class="comment">// destroy a shared</span>
<span class="ident">tx2</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
});
<span class="comment">// make sure the other thread has gone to sleep</span>
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">5000</span> { <span class="ident">thread</span>::<span class="ident">yield_now</span>(); }
<span class="comment">// upgrade to a shared chan and send a message</span>
<span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="ident">t</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
<span class="comment">// wait for the child thread to exit before we exit</span>
<span class="ident">rx2</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">issue_32114</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="kw">_</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">123</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">123</span>), <span class="prelude-val">Err</span>(<span class="ident">SendError</span>(<span class="number">123</span>)));
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">test</span>, <span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>)))]</span>
<span class="kw">mod</span> <span class="ident">sync_tests</span> {
<span class="kw">use</span> <span class="ident">env</span>;
<span class="kw">use</span> <span class="ident">thread</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">time</span>::<span class="ident">Duration</span>;
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stress_factor</span>() <span class="op">-></span> <span class="ident">usize</span> {
<span class="kw">match</span> <span class="ident">env</span>::<span class="ident">var</span>(<span class="string">"RUST_TEST_STRESS"</span>) {
<span class="prelude-val">Ok</span>(<span class="ident">val</span>) <span class="op">=></span> <span class="ident">val</span>.<span class="ident">parse</span>().<span class="ident">unwrap</span>(),
<span class="prelude-val">Err</span>(..) <span class="op">=></span> <span class="number">1</span>,
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">1</span>);
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">drop_full</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">_rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">isize</span><span class="op">>></span>(<span class="number">1</span>);
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="kw">box</span> <span class="number">1</span>).<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke_shared</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">1</span>);
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="kw">let</span> <span class="ident">tx</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">recv_timeout</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv_timeout</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>)), <span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError</span>::<span class="ident">Timeout</span>));
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv_timeout</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>)), <span class="prelude-val">Ok</span>(<span class="number">1</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke_threads</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
});
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke_port_gone</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="ident">drop</span>(<span class="ident">rx</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke_shared_port_gone2</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="ident">drop</span>(<span class="ident">rx</span>);
<span class="kw">let</span> <span class="ident">tx2</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tx2</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">port_gone_concurrent</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
});
<span class="kw">while</span> <span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_ok</span>() {}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">port_gone_concurrent_shared</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">tx2</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
});
<span class="kw">while</span> <span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_ok</span>() <span class="op">&&</span> <span class="ident">tx2</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_ok</span>() {}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke_chan_gone</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">smoke_chan_gone_shared</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span>()<span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">tx2</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="ident">drop</span>(<span class="ident">tx2</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">chan_gone_concurrent</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
});
<span class="kw">while</span> <span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">is_ok</span>() {}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">stress</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">10000</span> { <span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>(); }
});
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">10000</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">stress_recv_timeout_two_threads</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">10000</span> { <span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>(); }
});
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">recv_count</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">loop</span> {
<span class="kw">match</span> <span class="ident">rx</span>.<span class="ident">recv_timeout</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>)) {
<span class="prelude-val">Ok</span>(<span class="ident">v</span>) <span class="op">=></span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="number">1</span>);
<span class="ident">recv_count</span> <span class="op">+=</span> <span class="number">1</span>;
},
<span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError</span>::<span class="ident">Timeout</span>) <span class="op">=></span> <span class="kw">continue</span>,
<span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> <span class="kw">break</span>,
}
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">recv_count</span>, <span class="number">10000</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">stress_recv_timeout_shared</span>() {
<span class="kw">const</span> <span class="ident">AMT</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">1000</span>;
<span class="kw">const</span> <span class="ident">NTHREADS</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">8</span>;
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> (<span class="ident">dtx</span>, <span class="ident">drx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span>()<span class="op">></span>(<span class="number">0</span>);
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">recv_count</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">loop</span> {
<span class="kw">match</span> <span class="ident">rx</span>.<span class="ident">recv_timeout</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">10</span>)) {
<span class="prelude-val">Ok</span>(<span class="ident">v</span>) <span class="op">=></span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="number">1</span>);
<span class="ident">recv_count</span> <span class="op">+=</span> <span class="number">1</span>;
},
<span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError</span>::<span class="ident">Timeout</span>) <span class="op">=></span> <span class="kw">continue</span>,
<span class="prelude-val">Err</span>(<span class="ident">RecvTimeoutError</span>::<span class="ident">Disconnected</span>) <span class="op">=></span> <span class="kw">break</span>,
}
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">recv_count</span>, <span class="ident">AMT</span> <span class="op">*</span> <span class="ident">NTHREADS</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">try_recv</span>().<span class="ident">is_err</span>());
<span class="ident">dtx</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
});
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">NTHREADS</span> {
<span class="kw">let</span> <span class="ident">tx</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">AMT</span> { <span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>(); }
});
}
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="ident">drx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">stress_shared</span>() {
<span class="kw">const</span> <span class="ident">AMT</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">1000</span>;
<span class="kw">const</span> <span class="ident">NTHREADS</span>: <span class="ident">u32</span> <span class="op">=</span> <span class="number">8</span>;
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> (<span class="ident">dtx</span>, <span class="ident">drx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span>()<span class="op">></span>(<span class="number">0</span>);
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">AMT</span> <span class="op">*</span> <span class="ident">NTHREADS</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">1</span>);
}
<span class="kw">match</span> <span class="ident">rx</span>.<span class="ident">try_recv</span>() {
<span class="prelude-val">Ok</span>(..) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(),
<span class="kw">_</span> <span class="op">=></span> {}
}
<span class="ident">dtx</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
});
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">NTHREADS</span> {
<span class="kw">let</span> <span class="ident">tx</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">AMT</span> { <span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>(); }
});
}
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="ident">drx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_close_port_first</span>() {
<span class="comment">// Simple test of closing without sending</span>
<span class="kw">let</span> (<span class="ident">_tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="ident">drop</span>(<span class="ident">rx</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_close_chan_first</span>() {
<span class="comment">// Simple test of closing without sending</span>
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">_rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="ident">drop</span>(<span class="ident">tx</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_send_port_close</span>() {
<span class="comment">// Testing that the sender cleans up the payload if receiver is closed</span>
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>(<span class="number">0</span>);
<span class="ident">drop</span>(<span class="ident">rx</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">send</span>(<span class="kw">box</span> <span class="number">0</span>).<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_recv_chan_close</span>() {
<span class="comment">// Receiving on a closed chan will panic</span>
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
}).<span class="ident">join</span>();
<span class="comment">// What is our res?</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">res</span>.<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_send_then_recv</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>(<span class="number">1</span>);
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="kw">box</span> <span class="number">10</span>).<span class="ident">unwrap</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="number">10</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_try_send_open</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">try_send</span>(<span class="number">10</span>), <span class="prelude-val">Ok</span>(()));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="number">10</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_try_send_closed</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="ident">drop</span>(<span class="ident">rx</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">try_send</span>(<span class="number">10</span>), <span class="prelude-val">Err</span>(<span class="ident">TrySendError</span>::<span class="ident">Disconnected</span>(<span class="number">10</span>)));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_try_send_closed2</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">_rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">try_send</span>(<span class="number">10</span>), <span class="prelude-val">Err</span>(<span class="ident">TrySendError</span>::<span class="ident">Full</span>(<span class="number">10</span>)));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_try_recv_open</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">1</span>);
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">10</span>).<span class="ident">unwrap</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>() <span class="op">==</span> <span class="prelude-val">Ok</span>(<span class="number">10</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_try_recv_closed</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_try_recv_closed_with_data</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">1</span>);
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">10</span>).<span class="ident">unwrap</span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Ok</span>(<span class="number">10</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_peek_data</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Empty</span>));
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">10</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Ok</span>(<span class="number">10</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_peek_close</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_single_thread_peek_open</span>() {
<span class="kw">let</span> (<span class="ident">_tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Empty</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_multi_task_recv_then_send</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="number">10</span>);
});
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="kw">box</span> <span class="number">10</span>).<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_multi_task_recv_then_close</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">drop</span>(<span class="ident">tx</span>);
});
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="number">10</span>);
}).<span class="ident">join</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">res</span>.<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_multi_thread_close_stress</span>() {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">stress_factor</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">drop</span>(<span class="ident">rx</span>);
});
<span class="ident">drop</span>(<span class="ident">tx</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_multi_thread_send_close_stress</span>() {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">stress_factor</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">drop</span>(<span class="ident">rx</span>);
});
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
}).<span class="ident">join</span>();
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_multi_thread_recv_close_stress</span>() {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">stress_factor</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
}).<span class="ident">join</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">res</span>.<span class="ident">is_err</span>());
});
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">drop</span>(<span class="ident">tx</span>);
});
});
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">oneshot_multi_thread_send_recv_stress</span>() {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">stress_factor</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="kw">box</span> <span class="number">10</span>).<span class="ident">unwrap</span>();
});
<span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="number">10</span>);
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">stream_send_recv_stress</span>() {
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">stress_factor</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>(<span class="number">0</span>);
<span class="ident">send</span>(<span class="ident">tx</span>, <span class="number">0</span>);
<span class="ident">recv</span>(<span class="ident">rx</span>, <span class="number">0</span>);
<span class="kw">fn</span> <span class="ident">send</span>(<span class="ident">tx</span>: <span class="ident">SyncSender</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>, <span class="ident">i</span>: <span class="ident">i32</span>) {
<span class="kw">if</span> <span class="ident">i</span> <span class="op">==</span> <span class="number">10</span> { <span class="kw">return</span> }
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="kw">box</span> <span class="ident">i</span>).<span class="ident">unwrap</span>();
<span class="ident">send</span>(<span class="ident">tx</span>, <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>);
});
}
<span class="kw">fn</span> <span class="ident">recv</span>(<span class="ident">rx</span>: <span class="ident">Receiver</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">i32</span><span class="op">>></span>, <span class="ident">i</span>: <span class="ident">i32</span>) {
<span class="kw">if</span> <span class="ident">i</span> <span class="op">==</span> <span class="number">10</span> { <span class="kw">return</span> }
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>() <span class="op">==</span> <span class="ident">i</span>);
<span class="ident">recv</span>(<span class="ident">rx</span>, <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>);
});
}
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">recv_a_lot</span>() {
<span class="comment">// Regression test that we don't run out of stack in scheduler context</span>
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>(<span class="number">10000</span>);
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">10000</span> { <span class="ident">tx</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>(); }
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">10000</span> { <span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(); }
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">shared_chan_stress</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">total</span> <span class="op">=</span> <span class="ident">stress_factor</span>() <span class="op">+</span> <span class="number">100</span>;
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">total</span> {
<span class="kw">let</span> <span class="ident">tx</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
});
}
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">total</span> {
<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_nested_recv_iter</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> (<span class="ident">total_tx</span>, <span class="ident">total_rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">acc</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">rx</span>.<span class="ident">iter</span>() {
<span class="ident">acc</span> <span class="op">+=</span> <span class="ident">x</span>;
}
<span class="ident">total_tx</span>.<span class="ident">send</span>(<span class="ident">acc</span>).<span class="ident">unwrap</span>();
});
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">3</span>).<span class="ident">unwrap</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">unwrap</span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">total_rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">6</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_recv_iter_break</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> (<span class="ident">count_tx</span>, <span class="ident">count_rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">count</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">rx</span>.<span class="ident">iter</span>() {
<span class="kw">if</span> <span class="ident">count</span> <span class="op">>=</span> <span class="number">3</span> {
<span class="kw">break</span>;
} <span class="kw">else</span> {
<span class="ident">count</span> <span class="op">+=</span> <span class="ident">x</span>;
}
}
<span class="ident">count_tx</span>.<span class="ident">send</span>(<span class="ident">count</span>).<span class="ident">unwrap</span>();
});
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">unwrap</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">unwrap</span>();
<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">try_send</span>(<span class="number">2</span>);
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">count_rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(), <span class="number">4</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">try_recv_states</span>() {
<span class="kw">let</span> (<span class="ident">tx1</span>, <span class="ident">rx1</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">1</span>);
<span class="kw">let</span> (<span class="ident">tx2</span>, <span class="ident">rx2</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span>()<span class="op">></span>(<span class="number">1</span>);
<span class="kw">let</span> (<span class="ident">tx3</span>, <span class="ident">rx3</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span>()<span class="op">></span>(<span class="number">1</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">rx2</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
<span class="ident">tx1</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
<span class="ident">tx3</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
<span class="ident">rx2</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
<span class="ident">drop</span>(<span class="ident">tx1</span>);
<span class="ident">tx3</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
});
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx1</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Empty</span>));
<span class="ident">tx2</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
<span class="ident">rx3</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx1</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Ok</span>(<span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx1</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Empty</span>));
<span class="ident">tx2</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
<span class="ident">rx3</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">rx1</span>.<span class="ident">try_recv</span>(), <span class="prelude-val">Err</span>(<span class="ident">TryRecvError</span>::<span class="ident">Disconnected</span>));
}
<span class="comment">// This bug used to end up in a livelock inside of the Receiver destructor</span>
<span class="comment">// because the internal state of the Shared packet was corrupted</span>
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">destroy_upgraded_shared_port_when_sender_still_active</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span>()<span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> (<span class="ident">tx2</span>, <span class="ident">rx2</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span>()<span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(); <span class="comment">// wait on a oneshot</span>
<span class="ident">drop</span>(<span class="ident">rx</span>); <span class="comment">// destroy a shared</span>
<span class="ident">tx2</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
});
<span class="comment">// make sure the other thread has gone to sleep</span>
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">5000</span> { <span class="ident">thread</span>::<span class="ident">yield_now</span>(); }
<span class="comment">// upgrade to a shared chan and send a message</span>
<span class="kw">let</span> <span class="ident">t</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="ident">drop</span>(<span class="ident">tx</span>);
<span class="ident">t</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
<span class="comment">// wait for the child thread to exit before we exit</span>
<span class="ident">rx2</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">send1</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> { <span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>(); });
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>), <span class="prelude-val">Ok</span>(()));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">send2</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> { <span class="ident">drop</span>(<span class="ident">rx</span>); });
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">send3</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>), <span class="prelude-val">Ok</span>(()));
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span><span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> { <span class="ident">drop</span>(<span class="ident">rx</span>); });
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">send4</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="kw">let</span> <span class="ident">tx2</span> <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">clone</span>();
<span class="kw">let</span> (<span class="ident">done</span>, <span class="ident">donerx</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="kw">let</span> <span class="ident">done2</span> <span class="op">=</span> <span class="ident">done</span>.<span class="ident">clone</span>();
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">is_err</span>());
<span class="ident">done</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
});
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">tx2</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">is_err</span>());
<span class="ident">done2</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
});
<span class="ident">drop</span>(<span class="ident">rx</span>);
<span class="ident">donerx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
<span class="ident">donerx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">try_send1</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">_rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">try_send</span>(<span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">TrySendError</span>::<span class="ident">Full</span>(<span class="number">1</span>)));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">try_send2</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">_rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">try_send</span>(<span class="number">1</span>), <span class="prelude-val">Ok</span>(()));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">try_send</span>(<span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">TrySendError</span>::<span class="ident">Full</span>(<span class="number">1</span>)));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">try_send3</span>() {
<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">try_send</span>(<span class="number">1</span>), <span class="prelude-val">Ok</span>(()));
<span class="ident">drop</span>(<span class="ident">rx</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">tx</span>.<span class="ident">try_send</span>(<span class="number">1</span>), <span class="prelude-val">Err</span>(<span class="ident">TrySendError</span>::<span class="ident">Disconnected</span>(<span class="number">1</span>)));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">issue_15761</span>() {
<span class="kw">fn</span> <span class="ident">repro</span>() {
<span class="kw">let</span> (<span class="ident">tx1</span>, <span class="ident">rx1</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span>()<span class="op">></span>(<span class="number">3</span>);
<span class="kw">let</span> (<span class="ident">tx2</span>, <span class="ident">rx2</span>) <span class="op">=</span> <span class="ident">sync_channel</span>::<span class="op"><</span>()<span class="op">></span>(<span class="number">3</span>);
<span class="kw">let</span> <span class="ident">_t</span> <span class="op">=</span> <span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">rx1</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
<span class="ident">tx2</span>.<span class="ident">try_send</span>(()).<span class="ident">unwrap</span>();
});
<span class="ident">tx1</span>.<span class="ident">try_send</span>(()).<span class="ident">unwrap</span>();
<span class="ident">rx2</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
}
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">100</span> {
<span class="ident">repro</span>()
}
}
}
</pre>
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