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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 `oneshot` mod in crate `tokio`."><meta name="keywords" content="rust, rustlang, rust-lang, oneshot"><title>tokio::sync::oneshot - 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="../../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../../ayu.css" disabled ><script id="default-settings"></script><script src="../../../storage.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[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='../../../tokio/index.html'><div class='logo-container rust-logo'><img src='../../../rust-logo.png' alt='logo'></div></a><p class="location">Module oneshot</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#functions">Functions</a></li></ul></div><p class="location"><a href="../../index.html">tokio</a>::<wbr><a href="../index.html">sync</a></p><div id="sidebar-vars" data-name="oneshot" data-ty="mod" data-relpath="../"></div><script defer src="../sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<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">Module <a href="../../index.html">tokio</a>::<wbr><a href="../index.html">sync</a>::<wbr><a class="mod" href="">oneshot</a></span><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/tokio/sync/oneshot.rs.html#1-920" title="goto source code">[src]</a></span></h1><div class="docblock"><p>A one-shot channel is used for sending a single message between
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asynchronous tasks. The <a href="../../../tokio/sync/oneshot/fn.channel.html" title="channel"><code>channel</code></a> function is used to create a
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<a href="../../../tokio/sync/oneshot/struct.Sender.html" title="Sender"><code>Sender</code></a> and <a href="../../../tokio/sync/oneshot/struct.Receiver.html" title="Receiver"><code>Receiver</code></a> handle pair that form the channel.</p>
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<p>The <code>Sender</code> handle is used by the producer to send the value.
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The <code>Receiver</code> handle is used by the consumer to receive the value.</p>
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<p>Each handle can be used on separate tasks.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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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">tokio</span>::<span class="ident">sync</span>::<span class="ident">oneshot</span>;
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<span class="attribute">#[<span class="ident">tokio</span>::<span class="ident">main</span>]</span>
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<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">oneshot</span>::<span class="ident">channel</span>();
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<span class="ident">tokio</span>::<span class="ident">spawn</span>(<span class="kw">async</span> <span class="kw">move</span> {
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<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span> <span class="ident">tx</span>.<span class="ident">send</span>(<span class="number">3</span>) {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"the receiver dropped"</span>);
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}
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});
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<span class="kw">match</span> <span class="ident">rx</span>.<span class="kw">await</span> {
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<span class="prelude-val">Ok</span>(<span class="ident">v</span>) <span class="op">=</span><span class="op">></span> <span class="macro">println</span><span class="macro">!</span>(<span class="string">"got = {:?}"</span>, <span class="ident">v</span>),
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<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="macro">println</span><span class="macro">!</span>(<span class="string">"the sender dropped"</span>),
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}
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}</pre></div>
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<p>If the sender is dropped without sending, the receiver will fail with
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<a href="../../../tokio/sync/oneshot/error/struct.RecvError.html" title="error::RecvError"><code>error::RecvError</code></a>:</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">tokio</span>::<span class="ident">sync</span>::<span class="ident">oneshot</span>;
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<span class="attribute">#[<span class="ident">tokio</span>::<span class="ident">main</span>]</span>
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<span class="kw">async</span> <span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> (<span class="ident">tx</span>, <span class="ident">rx</span>) <span class="op">=</span> <span class="ident">oneshot</span>::<span class="ident">channel</span>::<span class="op"><</span><span class="ident">u32</span><span class="op">></span>();
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<span class="ident">tokio</span>::<span class="ident">spawn</span>(<span class="kw">async</span> <span class="kw">move</span> {
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<span class="ident">drop</span>(<span class="ident">tx</span>);
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});
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<span class="kw">match</span> <span class="ident">rx</span>.<span class="kw">await</span> {
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<span class="prelude-val">Ok</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"This doesn't happen"</span>),
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<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="macro">println</span><span class="macro">!</span>(<span class="string">"the sender dropped"</span>),
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}
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}</pre></div>
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</div><h2 id="modules" class="section-header"><a href="#modules">Modules</a></h2>
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<table><tr class="module-item"><td><a class="mod" href="error/index.html" title="tokio::sync::oneshot::error mod">error</a></td><td class="docblock-short"><p>Oneshot error types</p>
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</td></tr></table><h2 id="structs" class="section-header"><a href="#structs">Structs</a></h2>
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<table><tr class="module-item"><td><a class="struct" href="struct.Receiver.html" title="tokio::sync::oneshot::Receiver struct">Receiver</a></td><td class="docblock-short"><p>Receive a value from the associated <a href="../../../tokio/sync/oneshot/struct.Sender.html" title="Sender"><code>Sender</code></a>.</p>
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</td></tr><tr class="module-item"><td><a class="struct" href="struct.Sender.html" title="tokio::sync::oneshot::Sender struct">Sender</a></td><td class="docblock-short"><p>Sends a value to the associated <a href="../../../tokio/sync/oneshot/struct.Receiver.html" title="Receiver"><code>Receiver</code></a>.</p>
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</td></tr></table><h2 id="functions" class="section-header"><a href="#functions">Functions</a></h2>
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<table><tr class="module-item"><td><a class="fn" href="fn.channel.html" title="tokio::sync::oneshot::channel fn">channel</a></td><td class="docblock-short"><p>Create a new one-shot channel for sending single values across asynchronous
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tasks.</p>
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</td></tr></table></section><section id="search" class="content hidden"></section><section class="footer"></section><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="tokio"></div>
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