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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 `spawn_local` fn in crate `tokio`."><meta name="keywords" content="rust, rustlang, rust-lang, spawn_local"><title>tokio::task::spawn_local - 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">task</a></p><script>window.sidebarCurrent = {name: "spawn_local", 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/task/local.rs.html#194-210" title="goto source code">[src]</a></span><span class="in-band">Function <a href="../index.html">tokio</a>::<wbr><a href="index.html">task</a>::<wbr><a class="fn" href="">spawn_local</a></span></h1><pre class="rust fn">pub fn spawn_local<F>(future: F) -> <a class="struct" href="../../tokio/task/struct.JoinHandle.html" title="struct tokio::task::JoinHandle">JoinHandle</a><F::<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>><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/task/struct.JoinHandle.html" title="struct tokio::task::JoinHandle">JoinHandle</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/task/struct.JoinHandle.html" title="struct tokio::task::JoinHandle">JoinHandle</a><T></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="struct" href="../../tokio/task/struct.JoinError.html" title="struct tokio::task::JoinError">JoinError</a>>;</span></code></span></div></span></span> <span class="where fmt-newline">where<br> F: <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,<br> F::<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>: 'static, </span></pre><div class="docblock"><p>Spawns a <code>!Send</code> future on the local task set.</p>
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<p>The spawned future will be run on the same thread that called <code>spawn_local.</code>
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This may only be called from the context of a local task set.</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<ul>
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<li>This function panics if called outside of a local task set.</li>
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</ul>
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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">std</span>::<span class="ident">rc</span>::<span class="ident">Rc</span>;
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<span class="kw">use</span> <span class="ident">tokio</span>::<span class="ident">task</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="ident">async</span> <span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">unsend_data</span> <span class="op">=</span> <span class="ident">Rc</span>::<span class="ident">new</span>(<span class="string">"my unsend data..."</span>);
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<span class="kw">let</span> <span class="ident">local</span> <span class="op">=</span> <span class="ident">task</span>::<span class="ident">LocalSet</span>::<span class="ident">new</span>();
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<span class="comment">// Run the local task set.</span>
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<span class="ident">local</span>.<span class="ident">run_until</span>(<span class="ident">async</span> <span class="kw">move</span> {
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<span class="kw">let</span> <span class="ident">unsend_data</span> <span class="op">=</span> <span class="ident">unsend_data</span>.<span class="ident">clone</span>();
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<span class="ident">task</span>::<span class="ident">spawn_local</span>(<span class="ident">async</span> <span class="kw">move</span> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">unsend_data</span>);
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<span class="comment">// ...</span>
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}).<span class="ident">await</span>.<span class="ident">unwrap</span>();
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}).<span class="ident">await</span>;
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}</pre></div>
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