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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 `timeout_at` fn in crate `tokio`."><meta name="keywords" content="rust, rustlang, rust-lang, timeout_at"><title>tokio::time::timeout_at - 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 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='../../tokio/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class="location"><a href="../index.html">tokio</a>::<wbr><a href="index.html">time</a></p><script>window.sidebarCurrent = {name: "timeout_at", 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!" 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><span class="help-button">?</span>
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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="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/time/timeout.rs.html#90-100" title="goto source code">[src]</a></span><span class="in-band">Function <a href="../index.html">tokio</a>::<wbr><a href="index.html">time</a>::<wbr><a class="fn" href="">timeout_at</a></span></h1><pre class="rust fn">pub fn timeout_at<T>(deadline: <a class="struct" href="../../tokio/time/struct.Instant.html" title="struct tokio::time::Instant">Instant</a>, future: T) -> <a class="struct" href="../../tokio/time/struct.Timeout.html" title="struct tokio::time::Timeout">Timeout</a><T><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<div class="notable-traits-tooltiptext"><span class="docblock"><h3 class="notable">Notable traits for <a class="struct" href="../../tokio/time/struct.Timeout.html" title="struct tokio::time::Timeout">Timeout</a><T></h3><code class="content"><span class="where fmt-newline">impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a> for <a class="struct" href="../../tokio/time/struct.Timeout.html" title="struct tokio::time::Timeout">Timeout</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a>, </span></span><span class="where fmt-newline"> type <a href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html#associatedtype.Output" class="type">Output</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T::<a class="type" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html#associatedtype.Output" title="type core::future::future::Future::Output">Output</a>, <a class="struct" href="../../tokio/time/error/struct.Elapsed.html" title="struct tokio::time::error::Elapsed">Elapsed</a>>;</span></code></span></div></span></span> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a>, </span></pre><div class="docblock"><p>Require a <code>Future</code> to complete before the specified instant in time.</p>
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<p>If the future completes before the instant is reached, then the completed
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value is returned. Otherwise, an error is returned.</p>
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<h1 id="cancelation" class="section-header"><a href="#cancelation">Cancelation</a></h1>
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<p>Cancelling a timeout is done by dropping the future. No additional cleanup
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or other work is required.</p>
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<p>The original future may be obtained by calling <a href="../../tokio/time/struct.Timeout.html#method.into_inner" title="Timeout::into_inner"><code>Timeout::into_inner</code></a>. This
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consumes the <code>Timeout</code>.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<p>Create a new <code>Timeout</code> set to expire in 10 milliseconds.</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">time</span>::{<span class="ident">Instant</span>, <span class="ident">timeout_at</span>};
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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="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">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="comment">// Wrap the future with a `Timeout` set to expire 10 milliseconds into the</span>
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<span class="comment">// future.</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">timeout_at</span>(<span class="ident">Instant</span>::<span class="ident">now</span>() <span class="op">+</span> <span class="ident">Duration</span>::<span class="ident">from_millis</span>(<span class="number">10</span>), <span class="ident">rx</span>).<span class="ident">await</span> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"did not receive value within 10 ms"</span>);
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}</pre></div>
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