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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="Spawns a future on the current thread as a new task."><title>spawn in actix_web::rt - 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</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 class="fn" href="#">spawn</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 spawn<Fut>(f: Fut) -> <a class="struct" href="task/struct.JoinHandle.html" title="struct actix_web::rt::task::JoinHandle">JoinHandle</a><<Fut as <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a>>::<a class="associatedtype" 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 href="#" class="tooltip" data-notable-ty="JoinHandle<<Fut as Future>::Output>">ⓘ</a><div class="where">where
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Fut: <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a> + 'static,
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<Fut as <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a>>::<a class="associatedtype" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html#associatedtype.Output" title="type core::future::future::Future::Output">Output</a>: 'static,</div></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Spawns a future on the current thread as a new task.</p>
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<p>If not immediately awaited, the task can be cancelled using <a href="task/struct.JoinHandle.html#method.abort" title="method actix_web::rt::task::JoinHandle::abort"><code>JoinHandle::abort</code></a>.</p>
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<p>The provided future is spawned as a new task; therefore, panics are caught.</p>
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<h2 id="panics"><a class="doc-anchor" href="#panics">§</a>Panics</h2>
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<p>Panics if Actix system is not running.</p>
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="comment">// task resolves successfully
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</span><span class="macro">assert_eq!</span>(actix_rt::spawn(<span class="kw">async </span>{ <span class="number">1 </span>}).<span class="kw">await</span>.unwrap(), <span class="number">1</span>);
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<span class="comment">// task panics
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</span><span class="macro">assert!</span>(actix_rt::spawn(<span class="kw">async </span>{
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<span class="macro">panic!</span>(<span class="string">"panic is caught at task boundary"</span>);
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})
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.<span class="kw">await
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</span>.unwrap_err()
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.is_panic());
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<span class="comment">// task is cancelled before completion
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</span><span class="kw">let </span>handle = actix_rt::spawn(actix_rt::time::sleep(Duration::from_secs(<span class="number">100</span>)));
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handle.abort();
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<span class="macro">assert!</span>(handle.<span class="kw">await</span>.unwrap_err().is_cancelled());</code></pre></div>
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</div></details><script type="text/json" id="notable-traits-data">{"JoinHandle<<Fut as Future>::Output>":"<h3>Notable traits for <code><a class=\"struct\" href=\"task/struct.JoinHandle.html\" title=\"struct actix_web::rt::task::JoinHandle\">JoinHandle</a><T></code></h3><pre><code><div class=\"where\">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=\"task/struct.JoinHandle.html\" title=\"struct actix_web::rt::task::JoinHandle\">JoinHandle</a><T></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=\"enum\" href=\"https://doc.rust-lang.org/nightly/core/result/enum.Result.html\" title=\"enum core::result::Result\">Result</a><T, <a class=\"struct\" href=\"task/struct.JoinError.html\" title=\"struct actix_web::rt::task::JoinError\">JoinError</a>>;</div>"}</script></section></div></main></body></html> |