<!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="API documentation for the Rust `channel` fn in crate `std`."><meta name="keywords" content="rust, rustlang, rust-lang, channel"><title>std::sync::mpsc::channel - Rust</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 fn"><!--[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><div class="sidebar-elems"><p class='location'><a href='../../index.html'>std</a>::<wbr><a href='../index.html'>sync</a>::<wbr><a href='index.html'>mpsc</a></p><script>window.sidebarCurrent = {name: 'channel', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></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"><h1 class='fqn'><span class='in-band'>Function <a href='../../index.html'>std</a>::<wbr><a href='../index.html'>sync</a>::<wbr><a href='index.html'>mpsc</a>::<wbr><a class="fn" href=''>channel</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../../../src/std/sync/mpsc/mod.rs.html#724-727' title='goto source code'>[src]</a></span></h1><pre class='rust fn'>pub fn channel<T>() -> <a class="primitive" href="../../primitive.tuple.html">(</a><a class="struct" href="../../../std/sync/mpsc/struct.Sender.html" title="struct std::sync::mpsc::Sender">Sender</a><T>, <a class="struct" href="../../../std/sync/mpsc/struct.Receiver.html" title="struct std::sync::mpsc::Receiver">Receiver</a><T><a class="primitive" href="../../primitive.tuple.html">)</a></pre><div class='docblock'><p>Creates a new asynchronous channel, returning the sender/receiver halves.
All data sent on the <a href="struct.Sender.html"><code>Sender</code></a> will become available on the <a href="struct.Receiver.html"><code>Receiver</code></a> in
the same order as it was sent, and no <a href="struct.Sender.html#method.send"><code>send</code></a> will block the calling thread
(this channel has an "infinite buffer", unlike <a href="fn.sync_channel.html"><code>sync_channel</code></a>, which will
block after its buffer limit is reached). <a href="struct.Receiver.html#method.recv"><code>recv</code></a> will block until a message
is available.</p>
<p>The <a href="struct.Sender.html"><code>Sender</code></a> can be cloned to <a href="struct.Sender.html#method.send"><code>send</code></a> to the same channel multiple times, but
only one <a href="struct.Receiver.html"><code>Receiver</code></a> is supported.</p>
<p>If the <a href="struct.Receiver.html"><code>Receiver</code></a> is disconnected while trying to <a href="struct.Sender.html#method.send"><code>send</code></a> with the
<a href="struct.Sender.html"><code>Sender</code></a>, the <a href="struct.Sender.html#method.send"><code>send</code></a> method will return a <a href="struct.SendError.html"><code>SendError</code></a>. Similarly, If the
<a href="struct.Sender.html"><code>Sender</code></a> is disconnected while trying to <a href="struct.Receiver.html#method.recv"><code>recv</code></a>, the <a href="struct.Receiver.html#method.recv"><code>recv</code></a> method will
return a <a href="struct.RecvError.html"><code>RecvError</code></a>.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">mpsc</span>::<span class="ident">channel</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;
<span class="kw">let</span> (<span class="ident">sender</span>, <span class="ident">receiver</span>) <span class="op">=</span> <span class="ident">channel</span>();
<span class="comment">// Spawn off an expensive computation</span>
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span><span class="op">||</span> {
<span class="ident">sender</span>.<span class="ident">send</span>(<span class="ident">expensive_computation</span>()).<span class="ident">unwrap</span>();
});
<span class="comment">// Do some useful work for awhile</span>
<span class="comment">// Let's see what that answer was</span>
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">receiver</span>.<span class="ident">recv</span>().<span class="ident">unwrap</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Async%3A%3Ampsc%3A%3Achannel%3B%0Ause%20std%3A%3Athread%3B%0A%0Alet%20(sender%2C%20receiver)%20%3D%20channel()%3B%0A%0A%2F%2F%20Spawn%20off%20an%20expensive%20computation%0Athread%3A%3Aspawn(move%7C%7C%20%7B%0A%20%20fn%20expensive_computation()%20%7B%7D%0A%20%20%20%20sender.send(expensive_computation()).unwrap()%3B%0A%7D)%3B%0A%0A%2F%2F%20Do%20some%20useful%20work%20for%20awhile%0A%0A%2F%2F%20Let's%20see%20what%20that%20answer%20was%0Aprintln!(%22%7B%3A%3F%7D%22%2C%20receiver.recv().unwrap())%3B%0A%7D">Run</a></pre>
</div></section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g. <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../../../";window.currentCrate = "std";</script><script src="../../../aliases.js"></script><script src="../../../main.js"></script><script defer src="../../../search-index.js"></script></body></html>
distrib
>
Mageia
>
6
>
armv7hl
>
media
>
core-updates
>
by-pkgid
>
4e2dbb669434a7691662cb2f0ad38972
>
files
>
14831
