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<!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 `bounded` fn in crate `crossbeam`."><meta name="keywords" content="rust, rustlang, rust-lang, bounded"><title>crossbeam::channel::bounded - 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><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></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='../../crossbeam/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class='location'><a href='../index.html'>crossbeam</a>::<wbr><a href='index.html'>channel</a></p><script>window.sidebarCurrent = {name: 'bounded', 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"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><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='out-of-band'><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/crossbeam_channel/channel.rs.html#108-128' title='goto source code'>[src]</a></span><span class='in-band'>Function <a href='../index.html'>crossbeam</a>::<wbr><a href='index.html'>channel</a>::<wbr><a class="fn" href=''>bounded</a></span></h1><pre class='rust fn'>pub fn bounded<T>(cap: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a><a class="struct" href="../../crossbeam/channel/struct.Sender.html" title="struct crossbeam::channel::Sender">Sender</a><T>, <a class="struct" href="../../crossbeam/channel/struct.Receiver.html" title="struct crossbeam::channel::Receiver">Receiver</a><T><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a></pre><div class='docblock'><p>Creates a channel of bounded capacity.</p>
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<p>This channel has a buffer that can hold at most <code>cap</code> messages at a time.</p>
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<p>A special case is zero-capacity channel, which cannot hold any messages. Instead, send and
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receive operations must appear at the same time in order to pair up and pass the message over.</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>Panics if the capacity is greater than <code>usize::max_value() / 4</code>.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<p>A channel of capacity 1:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::<span class="ident">Duration</span>;
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<span class="kw">use</span> <span class="ident">crossbeam_channel</span>::<span class="ident">bounded</span>;
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<span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">r</span>) <span class="op">=</span> <span class="ident">bounded</span>(<span class="number">1</span>);
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<span class="comment">// This call returns immediately because there is enough space in the channel.</span>
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<span class="ident">s</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
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<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">|</span><span class="op">|</span> {
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<span class="comment">// This call blocks the current thread because the channel is full.</span>
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<span class="comment">// It will be able to complete only after the first message is received.</span>
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<span class="ident">s</span>.<span class="ident">send</span>(<span class="number">2</span>).<span class="ident">unwrap</span>();
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});
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<span class="ident">thread</span>::<span class="ident">sleep</span>(<span class="ident">Duration</span>::<span class="ident">from_secs</span>(<span class="number">1</span>));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">recv</span>(), <span class="prelude-val">Ok</span>(<span class="number">1</span>));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">recv</span>(), <span class="prelude-val">Ok</span>(<span class="number">2</span>));</pre></div>
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<p>A zero-capacity channel:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">thread</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::<span class="ident">Duration</span>;
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<span class="kw">use</span> <span class="ident">crossbeam_channel</span>::<span class="ident">bounded</span>;
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<span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">r</span>) <span class="op">=</span> <span class="ident">bounded</span>(<span class="number">0</span>);
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<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">|</span><span class="op">|</span> {
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<span class="comment">// This call blocks the current thread until a receive operation appears</span>
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<span class="comment">// on the other side of the channel.</span>
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<span class="ident">s</span>.<span class="ident">send</span>(<span class="number">1</span>).<span class="ident">unwrap</span>();
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});
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<span class="ident">thread</span>::<span class="ident">sleep</span>(<span class="ident">Duration</span>::<span class="ident">from_secs</span>(<span class="number">1</span>));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">r</span>.<span class="ident">recv</span>(), <span class="prelude-val">Ok</span>(<span class="number">1</span>));</pre></div>
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