146 lines
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146 lines
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<title>futures::sync::oneshot::spawn - Rust</title>
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<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>
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<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'>
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</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>,
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returning a handle representing the completion of the future.</p>
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<p>The <code>SpawnHandle</code> returned is a future that is a proxy for <code>future</code> itself.
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When <code>future</code> completes on <code>executor</code> then the <code>SpawnHandle</code> will itself be
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resolved. Internally <code>SpawnHandle</code> contains a <code>oneshot</code> channel and is
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thus safe to send across threads.</p>
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<p>The <code>future</code> will be canceled if the <code>SpawnHandle</code> is dropped. If this is
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not desired then the <code>SpawnHandle::forget</code> function can be used to continue
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running the future to completion.</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>This function will panic if the instance of <code>Spawn</code> provided is unable to
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spawn the <code>future</code> provided.</p>
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<p>If the provided instance of <code>Spawn</code> does not actually run <code>future</code> to
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completion, then the returned handle may panic when polled. Typically this
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is not a problem, though, as most instances of <code>Spawn</code> will run futures to
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completion.</p>
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<p>Note that the returned future will likely panic if the <code>futures</code> provided
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panics. If a future running on an executor panics that typically means that
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the executor drops the future, which falls into the above case of not
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running the future to completion essentially.</p>
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