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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` fn in crate `futures`."><meta name="keywords" content="rust, rustlang, rust-lang, spawn"><title>futures::sync::oneshot::spawn - 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="../../../dark.css"><link rel="stylesheet" type="text/css" href="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script></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><div class="sidebar-elems"><p class='location'><a href='../../index.html'>futures</a>::<wbr><a href='../index.html'>sync</a>::<wbr><a href='index.html'>oneshot</a></p><script>window.sidebarCurrent = {name: 'spawn', 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!"><img src="../../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><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'>Function <a href='../../index.html'>futures</a>::<wbr><a href='../index.html'>sync</a>::<wbr><a href='index.html'>oneshot</a>::<wbr><a class="fn" href=''>spawn</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/futures/sync/oneshot.rs.html#474-487' title='goto source code'>[src]</a></span></h1><pre class='rust fn'>pub fn spawn<F, E>(future: F, executor: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>E) -> <a class="struct" href="../../../futures/sync/oneshot/struct.SpawnHandle.html" title="struct futures::sync::oneshot::SpawnHandle">SpawnHandle</a><F::<a class="type" href="../../../futures/future/trait.Future.html#associatedtype.Item" title="type futures::future::Future::Item">Item</a>, F::<a class="type" href="../../../futures/future/trait.Future.html#associatedtype.Error" title="type futures::future::Future::Error">Error</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="../../../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a>,<br> E: <a class="trait" href="../../../futures/future/trait.Executor.html" title="trait futures::future::Executor">Executor</a><<a class="struct" href="../../../futures/sync/oneshot/struct.Execute.html" title="struct futures::sync::oneshot::Execute">Execute</a><F>>, </span></pre><div class='docblock'><p>Spawns a <code>future</code> onto the instance of <code>Executor</code> provided, <code>executor</code>,
- returning a handle representing the completion of the future.</p>
- <p>The <code>SpawnHandle</code> returned is a future that is a proxy for <code>future</code> itself.
- When <code>future</code> completes on <code>executor</code> then the <code>SpawnHandle</code> will itself be
- resolved. Internally <code>SpawnHandle</code> contains a <code>oneshot</code> channel and is
- thus safe to send across threads.</p>
- <p>The <code>future</code> will be canceled if the <code>SpawnHandle</code> is dropped. If this is
- not desired then the <code>SpawnHandle::forget</code> function can be used to continue
- running the future to completion.</p>
- <h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
- <p>This function will panic if the instance of <code>Spawn</code> provided is unable to
- spawn the <code>future</code> provided.</p>
- <p>If the provided instance of <code>Spawn</code> does not actually run <code>future</code> to
- completion, then the returned handle may panic when polled. Typically this
- is not a problem, though, as most instances of <code>Spawn</code> will run futures to
- completion.</p>
- <p>Note that the returned future will likely panic if the <code>futures</code> provided
- panics. If a future running on an executor panics that typically means that
- the executor drops the future, which falls into the above case of not
- running the future to completion essentially.</p>
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