152 lines
6.7 KiB
HTML
152 lines
6.7 KiB
HTML
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<meta name="description" content="API documentation for the Rust `spawn` fn in crate `tokio_executor`.">
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<meta name="keywords" content="rust, rustlang, rust-lang, spawn">
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<title>tokio_executor::spawn - Rust</title>
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<div class="sidebar-menu">☰</div>
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<p class='location'><a href='index.html'>tokio_executor</a></p><script>window.sidebarCurrent = {name: 'spawn', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Function <a href='index.html'>tokio_executor</a>::<wbr><a class="fn" href=''>spawn</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/tokio_executor/global.rs.html#138-143' title='goto source code'>[src]</a></span></h1>
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<pre class='rust fn'>pub fn spawn<T>(future: T) <span class="where fmt-newline">where<br> T: <a class="trait" href="../futures/future/trait.Future.html" title="trait futures::future::Future">Future</a><Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, Error = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + 'static, </span></pre><div class='docblock'><p>Submits a future for execution on the default executor -- usually a
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threadpool.</p>
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<p>Futures are lazy constructs. When they are defined, no work happens. In
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order for the logic defined by the future to be run, the future must be
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spawned on an executor. This function is the easiest way to do so.</p>
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<p>This function must be called from an execution context, i.e. from a future
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that has been already spawned onto an executor.</p>
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<p>Once spawned, the future will execute. The details of how that happens is
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left up to the executor instance. If the executor is a thread pool, the
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future will be pushed onto a queue that a worker thread polls from. If the
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executor is a "current thread" executor, the future might be polled
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immediately from within the call to <code>spawn</code> or it might be pushed onto an
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internal queue.</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 default executor is not set or if spawning
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onto the default executor returns an error. To avoid the panic, use the
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<code>DefaultExecutor</code> handle directly.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">futures</span>::<span class="ident">future</span>::<span class="ident">lazy</span>;
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<span class="ident">spawn</span>(<span class="ident">lazy</span>(<span class="op">||</span> {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"running on the default executor"</span>);
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<span class="prelude-val">Ok</span>(())
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}));</pre>
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</div></section>
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