<!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/condvar.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>condvar.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 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="kw">use</span> <span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicUsize</span>, <span class="ident">Ordering</span>};
<span class="kw">use</span> <span class="ident">sync</span>::{<span class="ident">mutex</span>, <span class="ident">MutexGuard</span>, <span class="ident">PoisonError</span>};
<span class="kw">use</span> <span class="ident">sys_common</span>::<span class="ident">condvar</span> <span class="kw">as</span> <span class="ident">sys</span>;
<span class="kw">use</span> <span class="ident">sys_common</span>::<span class="ident">mutex</span> <span class="kw">as</span> <span class="ident">sys_mutex</span>;
<span class="kw">use</span> <span class="ident">sys_common</span>::<span class="ident">poison</span>::{<span class="self">self</span>, <span class="ident">LockResult</span>};
<span class="kw">use</span> <span class="ident">time</span>::{<span class="ident">Duration</span>, <span class="ident">Instant</span>};
<span class="doccomment">/// A type indicating whether a timed wait on a condition variable returned</span>
<span class="doccomment">/// due to a time out or not.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It is returned by the [`wait_timeout`] method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`wait_timeout`]: struct.Condvar.html#method.wait_timeout</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Copy</span>, <span class="ident">Clone</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"wait_timeout"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">WaitTimeoutResult</span>(<span class="ident">bool</span>);
<span class="kw">impl</span> <span class="ident">WaitTimeoutResult</span> {
<span class="doccomment">/// Returns whether the wait was known to have timed out.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This example spawns a thread which will update the boolean value and</span>
<span class="doccomment">/// then wait 100 milliseconds before notifying the condvar.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The main thread will wait with a timeout on the condvar and then leave</span>
<span class="doccomment">/// once the boolean has been updated and notified.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::{Arc, Mutex, Condvar};</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let pair = Arc::new((Mutex::new(false), Condvar::new()));</span>
<span class="doccomment">/// let pair2 = pair.clone();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move|| {</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair2;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Let's wait 20 milliseconds before notifying the condvar.</span>
<span class="doccomment">/// thread::sleep(Duration::from_millis(20));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// // We update the boolean value.</span>
<span class="doccomment">/// *started = true;</span>
<span class="doccomment">/// cvar.notify_one();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Wait for the thread to start up.</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// loop {</span>
<span class="doccomment">/// // Let's put a timeout on the condvar's wait.</span>
<span class="doccomment">/// let result = cvar.wait_timeout(started, Duration::from_millis(10)).unwrap();</span>
<span class="doccomment">/// // 10 milliseconds have passed, or maybe the value changed!</span>
<span class="doccomment">/// started = result.0;</span>
<span class="doccomment">/// if *started == true {</span>
<span class="doccomment">/// // We received the notification and the value has been updated, we can leave.</span>
<span class="doccomment">/// break</span>
<span class="doccomment">/// }</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">"wait_timeout"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">timed_out</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="number">0</span>
}
}
<span class="doccomment">/// A Condition Variable</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Condition variables represent the ability to block a thread such that it</span>
<span class="doccomment">/// consumes no CPU time while waiting for an event to occur. Condition</span>
<span class="doccomment">/// variables are typically associated with a boolean predicate (a condition)</span>
<span class="doccomment">/// and a mutex. The predicate is always verified inside of the mutex before</span>
<span class="doccomment">/// determining that a thread must block.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Functions in this module will block the current **thread** of execution and</span>
<span class="doccomment">/// are bindings to system-provided condition variables where possible. Note</span>
<span class="doccomment">/// that this module places one additional restriction over the system condition</span>
<span class="doccomment">/// variables: each condvar can be used with precisely one mutex at runtime. Any</span>
<span class="doccomment">/// attempt to use multiple mutexes on the same condition variable will result</span>
<span class="doccomment">/// in a runtime panic. If this is not desired, then the unsafe primitives in</span>
<span class="doccomment">/// `sys` do not have this restriction but may result in undefined behavior.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::{Arc, Mutex, Condvar};</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let pair = Arc::new((Mutex::new(false), Condvar::new()));</span>
<span class="doccomment">/// let pair2 = pair.clone();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Inside of our lock, spawn a new thread, and then wait for it to start.</span>
<span class="doccomment">/// thread::spawn(move|| {</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair2;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// *started = true;</span>
<span class="doccomment">/// // We notify the condvar that the value has changed.</span>
<span class="doccomment">/// cvar.notify_one();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Wait for the thread to start up.</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// while !*started {</span>
<span class="doccomment">/// started = cvar.wait(started).unwrap();</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">struct</span> <span class="ident">Condvar</span> {
<span class="ident">inner</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">sys</span>::<span class="ident">Condvar</span><span class="op">></span>,
<span class="ident">mutex</span>: <span class="ident">AtomicUsize</span>,
}
<span class="kw">impl</span> <span class="ident">Condvar</span> {
<span class="doccomment">/// Creates a new condition variable which is ready to be waited on and</span>
<span class="doccomment">/// notified.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::Condvar;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let condvar = Condvar::new();</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">new</span>() <span class="op">-></span> <span class="ident">Condvar</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Condvar</span> {
<span class="ident">inner</span>: <span class="kw">box</span> <span class="ident">sys</span>::<span class="ident">Condvar</span>::<span class="ident">new</span>(),
<span class="ident">mutex</span>: <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="number">0</span>),
};
<span class="kw">unsafe</span> {
<span class="ident">c</span>.<span class="ident">inner</span>.<span class="ident">init</span>();
}
<span class="ident">c</span>
}
<span class="doccomment">/// Blocks the current thread until this condition variable receives a</span>
<span class="doccomment">/// notification.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will atomically unlock the mutex specified (represented by</span>
<span class="doccomment">/// `guard`) and block the current thread. This means that any calls</span>
<span class="doccomment">/// to [`notify_one`] or [`notify_all`] which happen logically after the</span>
<span class="doccomment">/// mutex is unlocked are candidates to wake this thread up. When this</span>
<span class="doccomment">/// function call returns, the lock specified will have been re-acquired.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that this function is susceptible to spurious wakeups. Condition</span>
<span class="doccomment">/// variables normally have a boolean predicate associated with them, and</span>
<span class="doccomment">/// the predicate must always be checked each time this function returns to</span>
<span class="doccomment">/// protect against spurious wakeups.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will return an error if the mutex being waited on is</span>
<span class="doccomment">/// poisoned when this thread re-acquires the lock. For more information,</span>
<span class="doccomment">/// see information about [poisoning] on the [`Mutex`] type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will [`panic!`] if it is used with more than one mutex</span>
<span class="doccomment">/// over time. Each condition variable is dynamically bound to exactly one</span>
<span class="doccomment">/// mutex to ensure defined behavior across platforms. If this functionality</span>
<span class="doccomment">/// is not desired, then unsafe primitives in `sys` are provided.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`notify_one`]: #method.notify_one</span>
<span class="doccomment">/// [`notify_all`]: #method.notify_all</span>
<span class="doccomment">/// [poisoning]: ../sync/struct.Mutex.html#poisoning</span>
<span class="doccomment">/// [`Mutex`]: ../sync/struct.Mutex.html</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">/// ```</span>
<span class="doccomment">/// use std::sync::{Arc, Mutex, Condvar};</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let pair = Arc::new((Mutex::new(false), Condvar::new()));</span>
<span class="doccomment">/// let pair2 = pair.clone();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move|| {</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair2;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// *started = true;</span>
<span class="doccomment">/// // We notify the condvar that the value has changed.</span>
<span class="doccomment">/// cvar.notify_one();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Wait for the thread to start up.</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// // As long as the value inside the `Mutex` is false, we wait.</span>
<span class="doccomment">/// while !*started {</span>
<span class="doccomment">/// started = cvar.wait(started).unwrap();</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">wait</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">guard</span>: <span class="ident">MutexGuard</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>)
<span class="op">-></span> <span class="ident">LockResult</span><span class="op"><</span><span class="ident">MutexGuard</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">>></span> {
<span class="kw">let</span> <span class="ident">poisoned</span> <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">mutex</span>::<span class="ident">guard_lock</span>(<span class="kw-2">&</span><span class="ident">guard</span>);
<span class="self">self</span>.<span class="ident">verify</span>(<span class="ident">lock</span>);
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">wait</span>(<span class="ident">lock</span>);
<span class="ident">mutex</span>::<span class="ident">guard_poison</span>(<span class="kw-2">&</span><span class="ident">guard</span>).<span class="ident">get</span>()
};
<span class="kw">if</span> <span class="ident">poisoned</span> {
<span class="prelude-val">Err</span>(<span class="ident">PoisonError</span>::<span class="ident">new</span>(<span class="ident">guard</span>))
} <span class="kw">else</span> {
<span class="prelude-val">Ok</span>(<span class="ident">guard</span>)
}
}
<span class="doccomment">/// Blocks the current thread until this condition variable receives a</span>
<span class="doccomment">/// notification and the required condition is met. Spurious wakeups are</span>
<span class="doccomment">/// ignored and this function will only return once the condition has been</span>
<span class="doccomment">/// met.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will atomically unlock the mutex specified (represented by</span>
<span class="doccomment">/// `guard`) and block the current thread. This means that any calls</span>
<span class="doccomment">/// to [`notify_one`] or [`notify_all`] which happen logically after the</span>
<span class="doccomment">/// mutex is unlocked are candidates to wake this thread up. When this</span>
<span class="doccomment">/// function call returns, the lock specified will have been re-acquired.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will return an error if the mutex being waited on is</span>
<span class="doccomment">/// poisoned when this thread re-acquires the lock. For more information,</span>
<span class="doccomment">/// see information about [poisoning] on the [`Mutex`] type.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`notify_one`]: #method.notify_one</span>
<span class="doccomment">/// [`notify_all`]: #method.notify_all</span>
<span class="doccomment">/// [poisoning]: ../sync/struct.Mutex.html#poisoning</span>
<span class="doccomment">/// [`Mutex`]: ../sync/struct.Mutex.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(wait_until)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::sync::{Arc, Mutex, Condvar};</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let pair = Arc::new((Mutex::new(false), Condvar::new()));</span>
<span class="doccomment">/// let pair2 = pair.clone();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move|| {</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair2;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// *started = true;</span>
<span class="doccomment">/// // We notify the condvar that the value has changed.</span>
<span class="doccomment">/// cvar.notify_one();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Wait for the thread to start up.</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair;</span>
<span class="doccomment">/// // As long as the value inside the `Mutex` is false, we wait.</span>
<span class="doccomment">/// let _guard = cvar.wait_until(lock.lock().unwrap(), |started| { *started }).unwrap();</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">"wait_until"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"47960"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wait_until</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">guard</span>: <span class="ident">MutexGuard</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>,
<span class="kw-2">mut</span> <span class="ident">condition</span>: <span class="ident">F</span>)
<span class="op">-></span> <span class="ident">LockResult</span><span class="op"><</span><span class="ident">MutexGuard</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">>></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">while</span> <span class="op">!</span><span class="ident">condition</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">guard</span>) {
<span class="ident">guard</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wait</span>(<span class="ident">guard</span>)<span class="question-mark">?</span>;
}
<span class="prelude-val">Ok</span>(<span class="ident">guard</span>)
}
<span class="doccomment">/// Waits on this condition variable for a notification, timing out after a</span>
<span class="doccomment">/// specified duration.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The semantics of this function are equivalent to [`wait`]</span>
<span class="doccomment">/// except that the thread will be blocked for roughly no longer</span>
<span class="doccomment">/// than `ms` milliseconds. This method should not be used for</span>
<span class="doccomment">/// precise timing due to anomalies such as preemption or platform</span>
<span class="doccomment">/// differences that may not cause the maximum amount of time</span>
<span class="doccomment">/// waited to be precisely `ms`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that the best effort is made to ensure that the time waited is</span>
<span class="doccomment">/// measured with a monotonic clock, and not affected by the changes made to</span>
<span class="doccomment">/// the system time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned boolean is `false` only if the timeout is known</span>
<span class="doccomment">/// to have elapsed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Like [`wait`], the lock specified will be re-acquired when this function</span>
<span class="doccomment">/// returns, regardless of whether the timeout elapsed or not.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`wait`]: #method.wait</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::{Arc, Mutex, Condvar};</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let pair = Arc::new((Mutex::new(false), Condvar::new()));</span>
<span class="doccomment">/// let pair2 = pair.clone();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move|| {</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair2;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// *started = true;</span>
<span class="doccomment">/// // We notify the condvar that the value has changed.</span>
<span class="doccomment">/// cvar.notify_one();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Wait for the thread to start up.</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// // As long as the value inside the `Mutex` is false, we wait.</span>
<span class="doccomment">/// loop {</span>
<span class="doccomment">/// let result = cvar.wait_timeout_ms(started, 10).unwrap();</span>
<span class="doccomment">/// // 10 milliseconds have passed, or maybe the value changed!</span>
<span class="doccomment">/// started = result.0;</span>
<span class="doccomment">/// if *started == true {</span>
<span class="doccomment">/// // We received the notification and the value has been updated, we can leave.</span>
<span class="doccomment">/// break</span>
<span class="doccomment">/// }</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">rustc_deprecated</span>(<span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"replaced by `std::sync::Condvar::wait_timeout`"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wait_timeout_ms</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">guard</span>: <span class="ident">MutexGuard</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">ms</span>: <span class="ident">u32</span>)
<span class="op">-></span> <span class="ident">LockResult</span><span class="op"><</span>(<span class="ident">MutexGuard</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">bool</span>)<span class="op">></span> {
<span class="kw">let</span> <span class="ident">res</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wait_timeout</span>(<span class="ident">guard</span>, <span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="ident">ms</span> <span class="kw">as</span> <span class="ident">u64</span>));
<span class="ident">poison</span>::<span class="ident">map_result</span>(<span class="ident">res</span>, <span class="op">|</span>(<span class="ident">a</span>, <span class="ident">b</span>)<span class="op">|</span> {
(<span class="ident">a</span>, <span class="op">!</span><span class="ident">b</span>.<span class="ident">timed_out</span>())
})
}
<span class="doccomment">/// Waits on this condition variable for a notification, timing out after a</span>
<span class="doccomment">/// specified duration.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The semantics of this function are equivalent to [`wait`] except that</span>
<span class="doccomment">/// the thread will be blocked for roughly no longer than `dur`. This</span>
<span class="doccomment">/// method should not be used for precise timing due to anomalies such as</span>
<span class="doccomment">/// preemption or platform differences that may not cause the maximum</span>
<span class="doccomment">/// amount of time waited to be precisely `dur`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that the best effort is made to ensure that the time waited is</span>
<span class="doccomment">/// measured with a monotonic clock, and not affected by the changes made to</span>
<span class="doccomment">/// the system time. This function is susceptible to spurious wakeups.</span>
<span class="doccomment">/// Condition variables normally have a boolean predicate associated with</span>
<span class="doccomment">/// them, and the predicate must always be checked each time this function</span>
<span class="doccomment">/// returns to protect against spurious wakeups. Additionally, it is</span>
<span class="doccomment">/// typically desirable for the time-out to not exceed some duration in</span>
<span class="doccomment">/// spite of spurious wakes, thus the sleep-duration is decremented by the</span>
<span class="doccomment">/// amount slept. Alternatively, use the `wait_timeout_until` method</span>
<span class="doccomment">/// to wait until a condition is met with a total time-out regardless</span>
<span class="doccomment">/// of spurious wakes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned [`WaitTimeoutResult`] value indicates if the timeout is</span>
<span class="doccomment">/// known to have elapsed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Like [`wait`], the lock specified will be re-acquired when this function</span>
<span class="doccomment">/// returns, regardless of whether the timeout elapsed or not.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`wait`]: #method.wait</span>
<span class="doccomment">/// [`wait_timeout_until`]: #method.wait_timeout_until</span>
<span class="doccomment">/// [`WaitTimeoutResult`]: struct.WaitTimeoutResult.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::{Arc, Mutex, Condvar};</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let pair = Arc::new((Mutex::new(false), Condvar::new()));</span>
<span class="doccomment">/// let pair2 = pair.clone();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move|| {</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair2;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// *started = true;</span>
<span class="doccomment">/// // We notify the condvar that the value has changed.</span>
<span class="doccomment">/// cvar.notify_one();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // wait for the thread to start up</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// // as long as the value inside the `Mutex` is false, we wait</span>
<span class="doccomment">/// loop {</span>
<span class="doccomment">/// let result = cvar.wait_timeout(started, Duration::from_millis(10)).unwrap();</span>
<span class="doccomment">/// // 10 milliseconds have passed, or maybe the value changed!</span>
<span class="doccomment">/// started = result.0;</span>
<span class="doccomment">/// if *started == true {</span>
<span class="doccomment">/// // We received the notification and the value has been updated, we can leave.</span>
<span class="doccomment">/// break</span>
<span class="doccomment">/// }</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">"wait_timeout"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.5.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wait_timeout</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">guard</span>: <span class="ident">MutexGuard</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>,
<span class="ident">dur</span>: <span class="ident">Duration</span>)
<span class="op">-></span> <span class="ident">LockResult</span><span class="op"><</span>(<span class="ident">MutexGuard</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">WaitTimeoutResult</span>)<span class="op">></span> {
<span class="kw">let</span> (<span class="ident">poisoned</span>, <span class="ident">result</span>) <span class="op">=</span> <span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">lock</span> <span class="op">=</span> <span class="ident">mutex</span>::<span class="ident">guard_lock</span>(<span class="kw-2">&</span><span class="ident">guard</span>);
<span class="self">self</span>.<span class="ident">verify</span>(<span class="ident">lock</span>);
<span class="kw">let</span> <span class="ident">success</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">wait_timeout</span>(<span class="ident">lock</span>, <span class="ident">dur</span>);
(<span class="ident">mutex</span>::<span class="ident">guard_poison</span>(<span class="kw-2">&</span><span class="ident">guard</span>).<span class="ident">get</span>(), <span class="ident">WaitTimeoutResult</span>(<span class="op">!</span><span class="ident">success</span>))
};
<span class="kw">if</span> <span class="ident">poisoned</span> {
<span class="prelude-val">Err</span>(<span class="ident">PoisonError</span>::<span class="ident">new</span>((<span class="ident">guard</span>, <span class="ident">result</span>)))
} <span class="kw">else</span> {
<span class="prelude-val">Ok</span>((<span class="ident">guard</span>, <span class="ident">result</span>))
}
}
<span class="doccomment">/// Waits on this condition variable for a notification, timing out after a</span>
<span class="doccomment">/// specified duration. Spurious wakes will not cause this function to</span>
<span class="doccomment">/// return.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The semantics of this function are equivalent to [`wait_until`] except</span>
<span class="doccomment">/// that the thread will be blocked for roughly no longer than `dur`. This</span>
<span class="doccomment">/// method should not be used for precise timing due to anomalies such as</span>
<span class="doccomment">/// preemption or platform differences that may not cause the maximum</span>
<span class="doccomment">/// amount of time waited to be precisely `dur`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that the best effort is made to ensure that the time waited is</span>
<span class="doccomment">/// measured with a monotonic clock, and not affected by the changes made to</span>
<span class="doccomment">/// the system time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned [`WaitTimeoutResult`] value indicates if the timeout is</span>
<span class="doccomment">/// known to have elapsed without the condition being met.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Like [`wait_until`], the lock specified will be re-acquired when this</span>
<span class="doccomment">/// function returns, regardless of whether the timeout elapsed or not.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`wait_until`]: #method.wait_until</span>
<span class="doccomment">/// [`wait_timeout`]: #method.wait_timeout</span>
<span class="doccomment">/// [`WaitTimeoutResult`]: struct.WaitTimeoutResult.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(wait_timeout_until)]</span>
<span class="doccomment">///</span>
<span class="doccomment">/// use std::sync::{Arc, Mutex, Condvar};</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let pair = Arc::new((Mutex::new(false), Condvar::new()));</span>
<span class="doccomment">/// let pair2 = pair.clone();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move|| {</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair2;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// *started = true;</span>
<span class="doccomment">/// // We notify the condvar that the value has changed.</span>
<span class="doccomment">/// cvar.notify_one();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // wait for the thread to start up</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair;</span>
<span class="doccomment">/// let result = cvar.wait_timeout_until(</span>
<span class="doccomment">/// lock.lock().unwrap(),</span>
<span class="doccomment">/// Duration::from_millis(100),</span>
<span class="doccomment">/// |&mut started| started,</span>
<span class="doccomment">/// ).unwrap();</span>
<span class="doccomment">/// if result.1.timed_out() {</span>
<span class="doccomment">/// // timed-out without the condition ever evaluating to true.</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// // access the locked mutex via result.0</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">"wait_timeout_until"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"47960"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">wait_timeout_until</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>, <span class="ident">F</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">guard</span>: <span class="ident">MutexGuard</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>,
<span class="ident">dur</span>: <span class="ident">Duration</span>, <span class="kw-2">mut</span> <span class="ident">condition</span>: <span class="ident">F</span>)
<span class="op">-></span> <span class="ident">LockResult</span><span class="op"><</span>(<span class="ident">MutexGuard</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>, <span class="ident">WaitTimeoutResult</span>)<span class="op">></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnMut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">T</span>) <span class="op">-></span> <span class="ident">bool</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="kw">loop</span> {
<span class="kw">if</span> <span class="ident">condition</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="kw-2">*</span><span class="ident">guard</span>) {
<span class="kw">return</span> <span class="prelude-val">Ok</span>((<span class="ident">guard</span>, <span class="ident">WaitTimeoutResult</span>(<span class="bool-val">false</span>)));
}
<span class="kw">let</span> <span class="ident">timeout</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">dur</span>.<span class="ident">checked_sub</span>(<span class="ident">start</span>.<span class="ident">elapsed</span>()) {
<span class="prelude-val">Some</span>(<span class="ident">timeout</span>) <span class="op">=></span> <span class="ident">timeout</span>,
<span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>((<span class="ident">guard</span>, <span class="ident">WaitTimeoutResult</span>(<span class="bool-val">true</span>))),
};
<span class="ident">guard</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">wait_timeout</span>(<span class="ident">guard</span>, <span class="ident">timeout</span>)<span class="question-mark">?</span>.<span class="number">0</span>;
}
}
<span class="doccomment">/// Wakes up one blocked thread on this condvar.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If there is a blocked thread on this condition variable, then it will</span>
<span class="doccomment">/// be woken up from its call to [`wait`] or [`wait_timeout`]. Calls to</span>
<span class="doccomment">/// `notify_one` are not buffered in any way.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To wake up all threads, see [`notify_all`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`wait`]: #method.wait</span>
<span class="doccomment">/// [`wait_timeout`]: #method.wait_timeout</span>
<span class="doccomment">/// [`notify_all`]: #method.notify_all</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::{Arc, Mutex, Condvar};</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let pair = Arc::new((Mutex::new(false), Condvar::new()));</span>
<span class="doccomment">/// let pair2 = pair.clone();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move|| {</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair2;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// *started = true;</span>
<span class="doccomment">/// // We notify the condvar that the value has changed.</span>
<span class="doccomment">/// cvar.notify_one();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Wait for the thread to start up.</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// // As long as the value inside the `Mutex` is false, we wait.</span>
<span class="doccomment">/// while !*started {</span>
<span class="doccomment">/// started = cvar.wait(started).unwrap();</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">notify_one</span>(<span class="kw-2">&</span><span class="self">self</span>) {
<span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">notify_one</span>() }
}
<span class="doccomment">/// Wakes up all blocked threads on this condvar.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will ensure that any current waiters on the condition</span>
<span class="doccomment">/// variable are awoken. Calls to `notify_all()` are not buffered in any</span>
<span class="doccomment">/// way.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To wake up only one thread, see [`notify_one`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`notify_one`]: #method.notify_one</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::sync::{Arc, Mutex, Condvar};</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let pair = Arc::new((Mutex::new(false), Condvar::new()));</span>
<span class="doccomment">/// let pair2 = pair.clone();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move|| {</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair2;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// *started = true;</span>
<span class="doccomment">/// // We notify the condvar that the value has changed.</span>
<span class="doccomment">/// cvar.notify_all();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Wait for the thread to start up.</span>
<span class="doccomment">/// let &(ref lock, ref cvar) = &*pair;</span>
<span class="doccomment">/// let mut started = lock.lock().unwrap();</span>
<span class="doccomment">/// // As long as the value inside the `Mutex` is false, we wait.</span>
<span class="doccomment">/// while !*started {</span>
<span class="doccomment">/// started = cvar.wait(started).unwrap();</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">notify_all</span>(<span class="kw-2">&</span><span class="self">self</span>) {
<span class="kw">unsafe</span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">notify_all</span>() }
}
<span class="kw">fn</span> <span class="ident">verify</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">mutex</span>: <span class="kw-2">&</span><span class="ident">sys_mutex</span>::<span class="ident">Mutex</span>) {
<span class="kw">let</span> <span class="ident">addr</span> <span class="op">=</span> <span class="ident">mutex</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw">_</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">mutex</span>.<span class="ident">compare_and_swap</span>(<span class="number">0</span>, <span class="ident">addr</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>) {
<span class="comment">// If we got out 0, then we have successfully bound the mutex to</span>
<span class="comment">// this cvar.</span>
<span class="number">0</span> <span class="op">=></span> {}
<span class="comment">// If we get out a value that's the same as `addr`, then someone</span>
<span class="comment">// already beat us to the punch.</span>
<span class="ident">n</span> <span class="kw">if</span> <span class="ident">n</span> <span class="op">==</span> <span class="ident">addr</span> <span class="op">=></span> {}
<span class="comment">// Anything else and we're using more than one mutex on this cvar,</span>
<span class="comment">// which is currently disallowed.</span>
<span class="kw">_</span> <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"attempted to use a condition variable with two \
mutexes"</span>),
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Condvar</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">pad</span>(<span class="string">"Condvar { .. }"</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"condvar_default"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.10.0"</span>)]</span>
<span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">Condvar</span> {
<span class="doccomment">/// Creates a `Condvar` which is ready to be waited on and notified.</span>
<span class="kw">fn</span> <span class="ident">default</span>() <span class="op">-></span> <span class="ident">Condvar</span> {
<span class="ident">Condvar</span>::<span class="ident">new</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">Drop</span> <span class="kw">for</span> <span class="ident">Condvar</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">unsafe</span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">destroy</span>() }
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="doccomment">/// #![feature(wait_until)]</span>
<span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">mpsc</span>::<span class="ident">channel</span>;
<span class="kw">use</span> <span class="ident">sync</span>::{<span class="ident">Condvar</span>, <span class="ident">Mutex</span>, <span class="ident">Arc</span>};
<span class="kw">use</span> <span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicBool</span>, <span class="ident">Ordering</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="kw">use</span> <span class="ident">u64</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">c</span> <span class="op">=</span> <span class="ident">Condvar</span>::<span class="ident">new</span>();
<span class="ident">c</span>.<span class="ident">notify_one</span>();
<span class="ident">c</span>.<span class="ident">notify_all</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">ignore</span>)]</span>
<span class="kw">fn</span> <span class="ident">notify_one</span>() {
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Mutex</span>::<span class="ident">new</span>(()));
<span class="kw">let</span> <span class="ident">m2</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">clone</span>();
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Condvar</span>::<span class="ident">new</span>());
<span class="kw">let</span> <span class="ident">c2</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">clone</span>();
<span class="kw">let</span> <span class="ident">g</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">lock</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="kw">let</span> <span class="ident">_g</span> <span class="op">=</span> <span class="ident">m2</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
<span class="ident">c2</span>.<span class="ident">notify_one</span>();
});
<span class="kw">let</span> <span class="ident">g</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">wait</span>(<span class="ident">g</span>).<span class="ident">unwrap</span>();
<span class="ident">drop</span>(<span class="ident">g</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">ignore</span>)]</span>
<span class="kw">fn</span> <span class="ident">notify_all</span>() {
<span class="kw">const</span> <span class="ident">N</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">10</span>;
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>((<span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="number">0</span>), <span class="ident">Condvar</span>::<span class="ident">new</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="ident">N</span> {
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> <span class="ident">data</span>.<span class="ident">clone</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">let</span> <span class="kw-2">&</span>(<span class="kw-2">ref</span> <span class="ident">lock</span>, <span class="kw-2">ref</span> <span class="ident">cond</span>) <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">data</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cnt</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
<span class="kw-2">*</span><span class="ident">cnt</span> <span class="op">+=</span> <span class="number">1</span>;
<span class="kw">if</span> <span class="kw-2">*</span><span class="ident">cnt</span> <span class="op">==</span> <span class="ident">N</span> {
<span class="ident">tx</span>.<span class="ident">send</span>(()).<span class="ident">unwrap</span>();
}
<span class="kw">while</span> <span class="kw-2">*</span><span class="ident">cnt</span> <span class="op">!=</span> <span class="number">0</span> {
<span class="ident">cnt</span> <span class="op">=</span> <span class="ident">cond</span>.<span class="ident">wait</span>(<span class="ident">cnt</span>).<span class="ident">unwrap</span>();
}
<span class="ident">tx</span>.<span class="ident">send</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">&</span>(<span class="kw-2">ref</span> <span class="ident">lock</span>, <span class="kw-2">ref</span> <span class="ident">cond</span>) <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">data</span>;
<span class="ident">rx</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cnt</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
<span class="kw-2">*</span><span class="ident">cnt</span> <span class="op">=</span> <span class="number">0</span>;
<span class="ident">cond</span>.<span class="ident">notify_all</span>();
<span class="ident">drop</span>(<span class="ident">cnt</span>);
<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">N</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="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">ignore</span>)]</span>
<span class="kw">fn</span> <span class="ident">wait_until</span>() {
<span class="kw">let</span> <span class="ident">pair</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>((<span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="bool-val">false</span>), <span class="ident">Condvar</span>::<span class="ident">new</span>()));
<span class="kw">let</span> <span class="ident">pair2</span> <span class="op">=</span> <span class="ident">pair</span>.<span class="ident">clone</span>();
<span class="comment">// Inside of our lock, spawn a new thread, and then wait for it to start.</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">&</span>(<span class="kw-2">ref</span> <span class="ident">lock</span>, <span class="kw-2">ref</span> <span class="ident">cvar</span>) <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">pair2</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">started</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
<span class="kw-2">*</span><span class="ident">started</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="comment">// We notify the condvar that the value has changed.</span>
<span class="ident">cvar</span>.<span class="ident">notify_one</span>();
});
<span class="comment">// Wait for the thread to start up.</span>
<span class="kw">let</span> <span class="kw-2">&</span>(<span class="kw-2">ref</span> <span class="ident">lock</span>, <span class="kw-2">ref</span> <span class="ident">cvar</span>) <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">pair</span>;
<span class="kw">let</span> <span class="ident">guard</span> <span class="op">=</span> <span class="ident">cvar</span>.<span class="ident">wait_until</span>(<span class="ident">lock</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>(), <span class="op">|</span><span class="ident">started</span><span class="op">|</span> {
<span class="kw-2">*</span><span class="ident">started</span>
});
<span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">guard</span>.<span class="ident">unwrap</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">ignore</span>)]</span>
<span class="kw">fn</span> <span class="ident">wait_timeout_wait</span>() {
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Mutex</span>::<span class="ident">new</span>(()));
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Condvar</span>::<span class="ident">new</span>());
<span class="kw">loop</span> {
<span class="kw">let</span> <span class="ident">g</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> (<span class="ident">_g</span>, <span class="ident">no_timeout</span>) <span class="op">=</span> <span class="ident">c</span>.<span class="ident">wait_timeout</span>(<span class="ident">g</span>, <span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>)).<span class="ident">unwrap</span>();
<span class="comment">// spurious wakeups mean this isn't necessarily true</span>
<span class="comment">// so execute test again, if not timeout</span>
<span class="kw">if</span> <span class="op">!</span><span class="ident">no_timeout</span>.<span class="ident">timed_out</span>() {
<span class="kw">continue</span>;
}
<span class="kw">break</span>;
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">ignore</span>)]</span>
<span class="kw">fn</span> <span class="ident">wait_timeout_until_wait</span>() {
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Mutex</span>::<span class="ident">new</span>(()));
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Condvar</span>::<span class="ident">new</span>());
<span class="kw">let</span> <span class="ident">g</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> (<span class="ident">_g</span>, <span class="ident">wait</span>) <span class="op">=</span> <span class="ident">c</span>.<span class="ident">wait_timeout_until</span>(<span class="ident">g</span>, <span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>), <span class="op">|</span><span class="kw">_</span><span class="op">|</span> { <span class="bool-val">false</span> }).<span class="ident">unwrap</span>();
<span class="comment">// no spurious wakeups. ensure it timed-out</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">wait</span>.<span class="ident">timed_out</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">ignore</span>)]</span>
<span class="kw">fn</span> <span class="ident">wait_timeout_until_instant_satisfy</span>() {
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Mutex</span>::<span class="ident">new</span>(()));
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Condvar</span>::<span class="ident">new</span>());
<span class="kw">let</span> <span class="ident">g</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> (<span class="ident">_g</span>, <span class="ident">wait</span>) <span class="op">=</span> <span class="ident">c</span>.<span class="ident">wait_timeout_until</span>(<span class="ident">g</span>, <span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">0</span>), <span class="op">|</span><span class="kw">_</span><span class="op">|</span> { <span class="bool-val">true</span> }).<span class="ident">unwrap</span>();
<span class="comment">// ensure it didn't time-out even if we were not given any time.</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">wait</span>.<span class="ident">timed_out</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">ignore</span>)]</span>
<span class="kw">fn</span> <span class="ident">wait_timeout_until_wake</span>() {
<span class="kw">let</span> <span class="ident">pair</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>((<span class="ident">Mutex</span>::<span class="ident">new</span>(<span class="bool-val">false</span>), <span class="ident">Condvar</span>::<span class="ident">new</span>()));
<span class="kw">let</span> <span class="ident">pair_copy</span> <span class="op">=</span> <span class="ident">pair</span>.<span class="ident">clone</span>();
<span class="kw">let</span> <span class="kw-2">&</span>(<span class="kw-2">ref</span> <span class="ident">m</span>, <span class="kw-2">ref</span> <span class="ident">c</span>) <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">pair</span>;
<span class="kw">let</span> <span class="ident">g</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">lock</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="kw">let</span> <span class="kw-2">&</span>(<span class="kw-2">ref</span> <span class="ident">lock</span>, <span class="kw-2">ref</span> <span class="ident">cvar</span>) <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">pair_copy</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">started</span> <span class="op">=</span> <span class="ident">lock</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
<span class="ident">thread</span>::<span class="ident">sleep</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>));
<span class="kw-2">*</span><span class="ident">started</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="ident">cvar</span>.<span class="ident">notify_one</span>();
});
<span class="kw">let</span> (<span class="ident">g2</span>, <span class="ident">wait</span>) <span class="op">=</span> <span class="ident">c</span>.<span class="ident">wait_timeout_until</span>(<span class="ident">g</span>, <span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="ident">u64</span>::<span class="ident">MAX</span>), <span class="op">|</span><span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">notified</span><span class="op">|</span> {
<span class="ident">notified</span>
}).<span class="ident">unwrap</span>();
<span class="comment">// ensure it didn't time-out even if we were not given any time.</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">wait</span>.<span class="ident">timed_out</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">g2</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">ignore</span>)]</span>
<span class="kw">fn</span> <span class="ident">wait_timeout_wake</span>() {
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Mutex</span>::<span class="ident">new</span>(()));
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Condvar</span>::<span class="ident">new</span>());
<span class="kw">loop</span> {
<span class="kw">let</span> <span class="ident">g</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">c2</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">clone</span>();
<span class="kw">let</span> <span class="ident">m2</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">clone</span>();
<span class="kw">let</span> <span class="ident">notified</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">AtomicBool</span>::<span class="ident">new</span>(<span class="bool-val">false</span>));
<span class="kw">let</span> <span class="ident">notified_copy</span> <span class="op">=</span> <span class="ident">notified</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="kw">let</span> <span class="ident">_g</span> <span class="op">=</span> <span class="ident">m2</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
<span class="ident">thread</span>::<span class="ident">sleep</span>(<span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">1</span>));
<span class="ident">notified_copy</span>.<span class="ident">store</span>(<span class="bool-val">true</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
<span class="ident">c2</span>.<span class="ident">notify_one</span>();
});
<span class="kw">let</span> (<span class="ident">g</span>, <span class="ident">timeout_res</span>) <span class="op">=</span> <span class="ident">c</span>.<span class="ident">wait_timeout</span>(<span class="ident">g</span>, <span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="ident">u64</span>::<span class="ident">MAX</span>)).<span class="ident">unwrap</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">timeout_res</span>.<span class="ident">timed_out</span>());
<span class="comment">// spurious wakeups mean this isn't necessarily true</span>
<span class="comment">// so execute test again, if not notified</span>
<span class="kw">if</span> <span class="op">!</span><span class="ident">notified</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>) {
<span class="ident">t</span>.<span class="ident">join</span>().<span class="ident">unwrap</span>();
<span class="kw">continue</span>;
}
<span class="ident">drop</span>(<span class="ident">g</span>);
<span class="ident">t</span>.<span class="ident">join</span>().<span class="ident">unwrap</span>();
<span class="kw">break</span>;
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">should_panic</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">ignore</span>)]</span>
<span class="kw">fn</span> <span class="ident">two_mutexes</span>() {
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Mutex</span>::<span class="ident">new</span>(()));
<span class="kw">let</span> <span class="ident">m2</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">clone</span>();
<span class="kw">let</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">Condvar</span>::<span class="ident">new</span>());
<span class="kw">let</span> <span class="ident">c2</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">clone</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">g</span> <span class="op">=</span> <span class="ident">m</span>.<span class="ident">lock</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="kw">let</span> <span class="ident">_g</span> <span class="op">=</span> <span class="ident">m2</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>();
<span class="ident">c2</span>.<span class="ident">notify_one</span>();
});
<span class="ident">g</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">wait</span>(<span class="ident">g</span>).<span class="ident">unwrap</span>();
<span class="ident">drop</span>(<span class="ident">g</span>);
<span class="kw">let</span> <span class="ident">m</span> <span class="op">=</span> <span class="ident">Mutex</span>::<span class="ident">new</span>(());
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">c</span>.<span class="ident">wait</span>(<span class="ident">m</span>.<span class="ident">lock</span>().<span class="ident">unwrap</span>()).<span class="ident">unwrap</span>();
}
}
</pre>
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