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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 `ThreadPool` struct in crate `rayon`."><meta name="keywords" content="rust, rustlang, rust-lang, ThreadPool"><title>rayon::ThreadPool - 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 struct"><!--[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><p class='location'>Struct ThreadPool</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a><a href="#method.install">install</a><a href="#method.current_num_threads">current_num_threads</a><a href="#method.current_thread_index">current_thread_index</a><a href="#method.current_thread_has_pending_tasks">current_thread_has_pending_tasks</a><a href="#method.join">join</a><a href="#method.scope">scope</a><a href="#method.spawn">spawn</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Drop">Drop</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div></div><p class='location'><a href='index.html'>rayon</a></p><script>window.sidebarCurrent = {name: 'ThreadPool', ty: 'struct', 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'>Struct <a href='index.html'>rayon</a>::<wbr><a class="struct" href=''>ThreadPool</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/rayon_core/thread_pool/mod.rs.html#51-53' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct ThreadPool { /* fields omitted */ }</pre></div><div class='docblock'><p>Represents a user created <a href="https://en.wikipedia.org/wiki/Thread_pool">thread-pool</a>.</p>
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<p>Use a <a href="struct.ThreadPoolBuilder.html"><code>ThreadPoolBuilder</code></a> to specify the number and/or names of threads
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in the pool. After calling <a href="struct.ThreadPoolBuilder.html#method.build"><code>ThreadPoolBuilder::build()</code></a>, you can then
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execute functions explicitly within this <a href="struct.ThreadPool.html"><code>ThreadPool</code></a> using
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<a href="struct.ThreadPool.html#method.install"><code>ThreadPool::install()</code></a>. By contrast, top level rayon functions
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(like <code>join()</code>) will execute implicitly within the current thread-pool.</p>
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<h2 id="creating-a-threadpool" class="section-header"><a href="#creating-a-threadpool">Creating a ThreadPool</a></h2>
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<pre class="rust rust-example-rendered">
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<span class="kw">let</span> <span class="ident">pool</span> <span class="op">=</span> <span class="ident">rayon</span>::<span class="ident">ThreadPoolBuilder</span>::<span class="ident">new</span>().<span class="ident">num_threads</span>(<span class="number">8</span>).<span class="ident">build</span>().<span class="ident">unwrap</span>();</pre>
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<p><a href="struct.ThreadPool.html#method.install"><code>install()</code></a> executes a closure in one of the <code>ThreadPool</code>'s
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threads. In addition, any other rayon operations called inside of <code>install()</code> will also
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execute in the context of the <code>ThreadPool</code>.</p>
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<p>When the <code>ThreadPool</code> is dropped, that's a signal for the threads it manages to terminate,
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they will complete executing any remaining work that you have spawned, and automatically
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terminate.</p>
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</div><h2 id='methods' class='small-section-header'>Methods<a href='#methods' class='anchor'></a></h2><h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="struct" href="../rayon/struct.ThreadPool.html" title="struct rayon::ThreadPool">ThreadPool</a></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rayon_core/thread_pool/mod.rs.html#60-250' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.new' class='fnname'>new</a>(<br> configuration: <a class="struct" href="../rayon_core/struct.Configuration.html" title="struct rayon_core::Configuration">Configuration</a><br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="../rayon/struct.ThreadPool.html" title="struct rayon::ThreadPool">ThreadPool</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><<a class="trait" href="https://doc.rust-lang.org/nightly/std/error/trait.Error.html" title="trait std::error::Error">Error</a> + 'static>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rayon_core/thread_pool/mod.rs.html#64-66' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='stability'><div class='stab deprecated'>Deprecated<p>: Use <code>ThreadPoolBuilder::build</code></p>
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</div></div><div class='docblock'><p>Deprecated in favor of <code>ThreadPoolBuilder::build</code>.</p>
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</div><h4 id='method.install' class="method"><span id='install.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.install' class='fnname'>install</a><OP, R>(&self, op: OP) -> R <span class="where fmt-newline">where<br> OP: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> R + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,<br> R: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rayon_core/thread_pool/mod.rs.html#120-125' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Executes <code>op</code> within the threadpool. Any attempts to use
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<code>join</code>, <code>scope</code>, or parallel iterators will then operate
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within that threadpool.</p>
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<h1 id="warning-thread-local-data" class="section-header"><a href="#warning-thread-local-data">Warning: thread-local data</a></h1>
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<p>Because <code>op</code> is executing within the Rayon thread-pool,
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thread-local data from the current thread will not be
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accessible.</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>If <code>op</code> should panic, that panic will be propagated.</p>
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<h2 id="using-install" class="section-header"><a href="#using-install">Using <code>install()</code></a></h2>
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<pre class="rust rust-example-rendered">
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="kw">let</span> <span class="ident">pool</span> <span class="op">=</span> <span class="ident">rayon</span>::<span class="ident">ThreadPoolBuilder</span>::<span class="ident">new</span>().<span class="ident">num_threads</span>(<span class="number">8</span>).<span class="ident">build</span>().<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="ident">pool</span>.<span class="ident">install</span>(<span class="op">||</span> <span class="ident">fib</span>(<span class="number">20</span>));
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">n</span>);
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}
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<span class="kw">fn</span> <span class="ident">fib</span>(<span class="ident">n</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="ident">usize</span> {
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<span class="kw">if</span> <span class="ident">n</span> <span class="op">==</span> <span class="number">0</span> <span class="op">||</span> <span class="ident">n</span> <span class="op">==</span> <span class="number">1</span> {
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<span class="kw">return</span> <span class="ident">n</span>;
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}
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<span class="kw">let</span> (<span class="ident">a</span>, <span class="ident">b</span>) <span class="op">=</span> <span class="ident">rayon</span>::<span class="ident">join</span>(<span class="op">||</span> <span class="ident">fib</span>(<span class="ident">n</span> <span class="op">-</span> <span class="number">1</span>), <span class="op">||</span> <span class="ident">fib</span>(<span class="ident">n</span> <span class="op">-</span> <span class="number">2</span>)); <span class="comment">// runs inside of `pool`</span>
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<span class="kw">return</span> <span class="ident">a</span> <span class="op">+</span> <span class="ident">b</span>;
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}</pre>
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</div><h4 id='method.current_num_threads' class="method"><span id='current_num_threads.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.current_num_threads' class='fnname'>current_num_threads</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rayon_core/thread_pool/mod.rs.html#139-141' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns the (current) number of threads in the thread pool.</p>
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<h1 id="future-compatibility-note" class="section-header"><a href="#future-compatibility-note">Future compatibility note</a></h1>
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<p>Note that unless this thread-pool was created with a
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<a href="struct.ThreadPoolBuilder.html"><code>ThreadPoolBuilder</code></a> that specifies the number of threads,
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then this number may vary over time in future versions (see <a href="struct.ThreadPoolBuilder.html#method.num_threads">the
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<code>num_threads()</code> method for details</a>).</p>
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</div><h4 id='method.current_thread_index' class="method"><span id='current_thread_index.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.current_thread_index' class='fnname'>current_thread_index</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rayon_core/thread_pool/mod.rs.html#164-175' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>If called from a Rayon worker thread in this thread-pool,
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returns the index of that thread; if not called from a Rayon
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thread, or called from a Rayon thread that belongs to a
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different thread-pool, returns <code>None</code>.</p>
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<p>The index for a given thread will not change over the thread's
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lifetime. However, multiple threads may share the same index if
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they are in distinct thread-pools.</p>
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<h1 id="future-compatibility-note-1" class="section-header"><a href="#future-compatibility-note-1">Future compatibility note</a></h1>
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<p>Currently, every thread-pool (including the global
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thread-pool) has a fixed number of threads, but this may
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change in future Rayon versions (see <a href="struct.ThreadPoolBuilder.html#method.num_threads">the <code>num_threads()</code> method
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for details</a>). In that case, the index for a
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thread would not change during its lifetime, but thread
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indices may wind up being reused if threads are terminated and
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restarted.</p>
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</div><h4 id='method.current_thread_has_pending_tasks' class="method"><span id='current_thread_has_pending_tasks.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.current_thread_has_pending_tasks' class='fnname'>current_thread_has_pending_tasks</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rayon_core/thread_pool/mod.rs.html#199-210' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns true if the current worker thread currently has "local
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tasks" pending. This can be useful as part of a heuristic for
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deciding whether to spawn a new task or execute code on the
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current thread, particularly in breadth-first
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schedulers. However, keep in mind that this is an inherently
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racy check, as other worker threads may be actively "stealing"
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tasks from our local deque.</p>
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<p><strong>Background:</strong> Rayon's uses a <a href="https://en.wikipedia.org/wiki/Work_stealing">work-stealing</a> scheduler. The
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key idea is that each thread has its own <a href="https://en.wikipedia.org/wiki/Double-ended_queue">deque</a> of
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tasks. Whenever a new task is spawned -- whether through
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<code>join()</code>, <code>Scope::spawn()</code>, or some other means -- that new
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task is pushed onto the thread's <em>local</em> deque. Worker threads
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have a preference for executing their own tasks; if however
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they run out of tasks, they will go try to "steal" tasks from
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other threads. This function therefore has an inherent race
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with other active worker threads, which may be removing items
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from the local deque.</p>
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</div><h4 id='method.join' class="method"><span id='join.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.join' class='fnname'>join</a><A, B, RA, RB>(&self, oper_a: A, oper_b: B) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>RA, RB<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a> <span class="where fmt-newline">where<br> A: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> RA + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,<br> B: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>() -> RB + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,<br> RA: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,<br> RB: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rayon_core/thread_pool/mod.rs.html#215-222' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Execute <code>oper_a</code> and <code>oper_b</code> in the thread-pool and return
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the results. Equivalent to <code>self.install(|| join(oper_a, oper_b))</code>.</p>
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</div><h4 id='method.scope' class="method"><span id='scope.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.scope' class='fnname'>scope</a><'scope, OP, R>(&self, op: OP) -> R <span class="where fmt-newline">where<br> OP: for<'s> <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&'s <a class="struct" href="../rayon/struct.Scope.html" title="struct rayon::Scope">Scope</a><'scope>) -> R + 'scope + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>,<br> R: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>, </span></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rayon_core/thread_pool/mod.rs.html#230-234' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Creates a scope that executes within this thread-pool.
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Equivalent to <code>self.install(|| scope(...))</code>.</p>
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<p>See also: <a href="fn.scope.html">the <code>scope()</code> function</a>.</p>
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</div><h4 id='method.spawn' class="method"><span id='spawn.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.spawn' class='fnname'>spawn</a><OP>(&self, op: OP) <span class="where fmt-newline">where<br> OP: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</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></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rayon_core/thread_pool/mod.rs.html#244-249' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Spawns an asynchronous task in this thread-pool. This task will
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run in the implicit, global scope, which means that it may outlast
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the current stack frame -- therefore, it cannot capture any references
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onto the stack (you will likely need a <code>move</code> closure).</p>
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<p>See also: <a href="struct.Scope.html#method.spawn">the <code>spawn()</code> function defined on scopes</a>.</p>
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</div></div><h2 id='implementations' class='small-section-header'>Trait Implementations<a href='#implementations' class='anchor'></a></h2><div id='implementations-list'><h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../rayon/struct.ThreadPool.html" title="struct rayon::ThreadPool">ThreadPool</a></code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rayon_core/thread_pool/mod.rs.html#258-265' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, fmt: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rayon_core/thread_pool/mod.rs.html#259-264' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></div><h3 id='impl-Drop' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html" title="trait core::ops::drop::Drop">Drop</a> for <a class="struct" href="../rayon/struct.ThreadPool.html" title="struct rayon::ThreadPool">ThreadPool</a></code><a href='#impl-Drop' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rayon_core/thread_pool/mod.rs.html#252-256' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.drop' class="method"><span id='drop.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop' class='fnname'>drop</a>(&mut self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/rayon_core/thread_pool/mod.rs.html#253-255' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Executes the destructor for this type. <a href="https://doc.rust-lang.org/nightly/core/ops/drop/trait.Drop.html#tymethod.drop">Read more</a></p>
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