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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="Waits until `deadline` is reached."><title>sleep_until in actix_web::rt::time - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../../static.files/rustdoc-dd39b87e5fcfba68.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="actix_web" data-themes="" data-resource-suffix="" data-rustdoc-version="1.80.0-nightly (bdbbb6c6a 2024-05-26)" data-channel="nightly" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-df360f571f6edeae.css"></noscript><link rel="icon" href="https://actix.rs/favicon.ico"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../../actix_web/index.html"><img src="https://actix.rs/img/logo.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../../actix_web/index.html"><img src="https://actix.rs/img/logo.png" alt="logo"></a><h2><a href="../../../actix_web/index.html">actix_web</a><span class="version">4.6.0</span></h2></div><div class="sidebar-elems"><h2><a href="index.html">In actix_web::rt::time</a></h2></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Function <a href="../../index.html">actix_web</a>::<wbr><a href="../index.html">rt</a>::<wbr><a href="index.html">time</a>::<wbr><a class="fn" href="#">sleep_until</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub fn sleep_until(deadline: <a class="struct" href="struct.Instant.html" title="struct actix_web::rt::time::Instant">Instant</a>) -> <a class="struct" href="struct.Sleep.html" title="struct actix_web::rt::time::Sleep">Sleep</a> <a href="#" class="tooltip" data-notable-ty="Sleep">ⓘ</a></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Waits until <code>deadline</code> is reached.</p>
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<p>No work is performed while awaiting on the sleep future to complete. <code>Sleep</code>
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operates at millisecond granularity and should not be used for tasks that
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require high-resolution timers.</p>
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<p>To run something regularly on a schedule, see <a href="fn.interval.html" title="fn actix_web::rt::time::interval"><code>interval</code></a>.</p>
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<h2 id="cancellation"><a class="doc-anchor" href="#cancellation">§</a>Cancellation</h2>
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<p>Canceling a sleep instance is done by dropping the returned future. No additional
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cleanup work is required.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<p>Wait 100ms and print “100 ms have elapsed”.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>tokio::time::{sleep_until, Instant, Duration};
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<span class="attr">#[tokio::main]
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</span><span class="kw">async fn </span>main() {
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sleep_until(Instant::now() + Duration::from_millis(<span class="number">100</span>)).<span class="kw">await</span>;
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<span class="macro">println!</span>(<span class="string">"100 ms have elapsed"</span>);
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}</code></pre></div>
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<p>See the documentation for the <a href="struct.Sleep.html" title="struct actix_web::rt::time::Sleep"><code>Sleep</code></a> type for more examples.</p>
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<h2 id="panics"><a class="doc-anchor" href="#panics">§</a>Panics</h2>
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<p>This function panics if there is no current timer set.</p>
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<p>It can be triggered when <a href="crate::runtime::Builder::enable_time"><code>Builder::enable_time</code></a> or
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<a href="crate::runtime::Builder::enable_all"><code>Builder::enable_all</code></a> are not included in the builder.</p>
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<p>It can also panic whenever a timer is created outside of a
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Tokio runtime. That is why <code>rt.block_on(sleep(...))</code> will panic,
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since the function is executed outside of the runtime.
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Whereas <code>rt.block_on(async {sleep(...).await})</code> doesn’t panic.
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And this is because wrapping the function on an async makes it lazy,
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and so gets executed inside the runtime successfully without
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panicking.</p>
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</div></details><script type="text/json" id="notable-traits-data">{"Sleep":"<h3>Notable traits for <code><a class=\"struct\" href=\"struct.Sleep.html\" title=\"struct actix_web::rt::time::Sleep\">Sleep</a></code></h3><pre><code><div class=\"where\">impl <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=\"struct.Sleep.html\" title=\"struct actix_web::rt::time::Sleep\">Sleep</a></div><div class=\"where\"> type <a href=\"https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html#associatedtype.Output\" class=\"associatedtype\">Output</a> = <a class=\"primitive\" href=\"https://doc.rust-lang.org/nightly/std/primitive.unit.html\">()</a>;</div>"}</script></section></div></main></body></html>
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