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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 `ThreadPoolBuilder` struct in crate `rayon_core`."><meta name="keywords" content="rust, rustlang, rust-lang, ThreadPoolBuilder"><title>rayon_core::ThreadPoolBuilder - 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><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></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><a href='../rayon_core/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><p class='location'>Struct ThreadPoolBuilder</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.breadth_first">breadth_first</a><a href="#method.build">build</a><a href="#method.build_global">build_global</a><a href="#method.build_scoped">build_scoped</a><a href="#method.exit_handler">exit_handler</a><a href="#method.new">new</a><a href="#method.num_threads">num_threads</a><a href="#method.panic_handler">panic_handler</a><a href="#method.spawn_handler">spawn_handler</a><a href="#method.stack_size">stack_size</a><a href="#method.start_handler">start_handler</a><a href="#method.thread_name">thread_name</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a><a href="#impl-Default">Default</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-RefUnwindSafe">!RefUnwindSafe</a><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</a><a href="#impl-Unpin">Unpin</a><a href="#impl-UnwindSafe">!UnwindSafe</a></div><a class="sidebar-title" href="#blanket-implementations">Blanket Implementations</a><div class="sidebar-links"><a href="#impl-Any">Any</a><a href="#impl-Borrow%3CT%3E">Borrow<T></a><a href="#impl-BorrowMut%3CT%3E">BorrowMut<T></a><a href="#impl-From%3CT%3E">From<T></a><a href="#impl-Into%3CU%3E">Into<U></a><a href="#impl-TryFrom%3CU%3E">TryFrom<U></a><a href="#impl-TryInto%3CU%3E">TryInto<U></a></div></div><p class='location'><a href='index.html'>rayon_core</a></p><script>window.sidebarCurrent = {name: 'ThreadPoolBuilder', 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"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><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/rayon_core/lib.rs.html#132-161' title='goto source code'>[src]</a></span><span class='in-band'>Struct <a href='index.html'>rayon_core</a>::<wbr><a class="struct" href=''>ThreadPoolBuilder</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust struct'>pub struct ThreadPoolBuilder<S = DefaultSpawn> { /* fields omitted */ }</pre></div><div class='docblock'><p>Used to create a new <a href="struct.ThreadPool.html"><code>ThreadPool</code></a> or to configure the global rayon 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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<p>The following creates a thread pool with 22 threads.</p>
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<div class="example-wrap"><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">22</span>).<span class="ident">build</span>().<span class="ident">unwrap</span>();</pre></div>
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<p>To instead configure the global thread pool, use <a href="struct.ThreadPoolBuilder.html#method.build_global"><code>build_global()</code></a>:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="ident">rayon</span>::<span class="ident">ThreadPoolBuilder</span>::<span class="ident">new</span>().<span class="ident">num_threads</span>(<span class="number">22</span>).<span class="ident">build_global</span>().<span class="ident">unwrap</span>();</pre></div>
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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'><code class='in-band'>impl <a class="struct" href="../rayon_core/struct.ThreadPoolBuilder.html" title="struct rayon_core::ThreadPoolBuilder">ThreadPoolBuilder</a></code><a href='#impl' class='anchor'></a><a class='srclink' href='../src/rayon_core/lib.rs.html#201-206' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.new' class="method"><code id='new.v'>pub fn <a href='#method.new' class='fnname'>new</a>() -> Self</code><a class='srclink' href='../src/rayon_core/lib.rs.html#203-205' title='goto source code'>[src]</a></h4><div class='docblock'><p>Creates and returns a valid rayon thread pool builder, but does not initialize it.</p>
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</div></div><h3 id='impl-1' class='impl'><code class='in-band'>impl<S> <a class="struct" href="../rayon_core/struct.ThreadPoolBuilder.html" title="struct rayon_core::ThreadPoolBuilder">ThreadPoolBuilder</a><S> <span class="where fmt-newline">where<br> S: ThreadSpawn, </span></code><a href='#impl-1' class='anchor'></a><a class='srclink' href='../src/rayon_core/lib.rs.html#210-241' title='goto source code'>[src]</a></h3><div class='docblock'><p>Note: the <code>S: ThreadSpawn</code> constraint is an internal implementation detail for the
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default spawn and those set by <a href="#method.spawn_handler"><code>spawn_handler</code></a>.</p>
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</div><div class='impl-items'><h4 id='method.build' class="method"><code id='build.v'>pub fn <a href='#method.build' class='fnname'>build</a>(self) -> <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_core/struct.ThreadPool.html" title="struct rayon_core::ThreadPool">ThreadPool</a>, <a class="struct" href="../rayon_core/struct.ThreadPoolBuildError.html" title="struct rayon_core::ThreadPoolBuildError">ThreadPoolBuildError</a>></code><a class='srclink' href='../src/rayon_core/lib.rs.html#215-217' title='goto source code'>[src]</a></h4><div class='docblock'><p>Create a new <code>ThreadPool</code> initialized using this configuration.</p>
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</div><h4 id='method.build_global' class="method"><code id='build_global.v'>pub fn <a href='#method.build_global' class='fnname'>build_global</a>(self) -> <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="../rayon_core/struct.ThreadPoolBuildError.html" title="struct rayon_core::ThreadPoolBuildError">ThreadPoolBuildError</a>></code><a class='srclink' href='../src/rayon_core/lib.rs.html#236-240' title='goto source code'>[src]</a></h4><div class='docblock'><p>Initializes the global thread pool. This initialization is
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<strong>optional</strong>. If you do not call this function, the thread pool
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will be automatically initialized with the default
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configuration. Calling <code>build_global</code> is not recommended, except
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in two scenarios:</p>
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<ul>
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<li>You wish to change the default configuration.</li>
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<li>You are running a benchmark, in which case initializing may
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yield slightly more consistent results, since the worker threads
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will already be ready to go even in the first iteration. But
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this cost is minimal.</li>
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</ul>
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<p>Initialization of the global thread pool happens exactly
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once. Once started, the configuration cannot be
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changed. Therefore, if you call <code>build_global</code> a second time, it
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will return an error. An <code>Ok</code> result indicates that this
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is the first initialization of the thread pool.</p>
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</div></div><h3 id='impl-2' class='impl'><code class='in-band'>impl <a class="struct" href="../rayon_core/struct.ThreadPoolBuilder.html" title="struct rayon_core::ThreadPoolBuilder">ThreadPoolBuilder</a></code><a href='#impl-2' class='anchor'></a><a class='srclink' href='../src/rayon_core/lib.rs.html#243-311' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.build_scoped' class="method"><code id='build_scoped.v'>pub fn <a href='#method.build_scoped' class='fnname'>build_scoped</a><W, F, R>(<br> self, <br> wrapper: W, <br> with_pool: F<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><R, <a class="struct" href="../rayon_core/struct.ThreadPoolBuildError.html" title="struct rayon_core::ThreadPoolBuildError">ThreadPoolBuildError</a>> <span class="where fmt-newline">where<br> W: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(<a class="struct" href="../rayon_core/struct.ThreadBuilder.html" title="struct rayon_core::ThreadBuilder">ThreadBuilder</a>) + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a>,<br> F: <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="struct" href="../rayon_core/struct.ThreadPool.html" title="struct rayon_core::ThreadPool">ThreadPool</a>) -> R, </span></code><a class='srclink' href='../src/rayon_core/lib.rs.html#283-310' title='goto source code'>[src]</a></h4><div class='docblock'><p>Create a scoped <code>ThreadPool</code> initialized using this configuration.</p>
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<p>This is a convenience function for building a pool using <a href="https://docs.rs/crossbeam/0.7/crossbeam/fn.scope.html"><code>crossbeam::scope</code></a>
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to spawn threads in a <a href="#method.spawn_handler"><code>spawn_handler</code></a>.
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The threads in this pool will start by calling <code>wrapper</code>, which should
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do initialization and continue by calling <code>ThreadBuilder::run()</code>.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<p>A scoped pool may be useful in combination with scoped thread-local variables.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="attribute">#[<span class="ident">macro_use</span>]</span>
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">scoped_tls</span>;
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<span class="macro">scoped_thread_local</span><span class="macro">!</span>(<span class="kw">static</span> <span class="ident">POOL_DATA</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span>);
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<span class="kw">fn</span> <span class="ident">main</span>() <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">rayon</span>::<span class="ident">ThreadPoolBuildError</span><span class="op">></span> {
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<span class="kw">let</span> <span class="ident">pool_data</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
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<span class="comment">// We haven't assigned any TLS data yet.</span>
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<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">POOL_DATA</span>.<span class="ident">is_set</span>());
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<span class="ident">rayon</span>::<span class="ident">ThreadPoolBuilder</span>::<span class="ident">new</span>()
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.<span class="ident">build_scoped</span>(
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<span class="comment">// Borrow `pool_data` in TLS for each thread.</span>
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<span class="op">|</span><span class="ident">thread</span><span class="op">|</span> <span class="ident">POOL_DATA</span>.<span class="ident">set</span>(<span class="kw-2">&</span><span class="ident">pool_data</span>, <span class="op">|</span><span class="op">|</span> <span class="ident">thread</span>.<span class="ident">run</span>()),
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<span class="comment">// Do some work that needs the TLS data.</span>
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<span class="op">|</span><span class="ident">pool</span><span class="op">|</span> <span class="ident">pool</span>.<span class="ident">install</span>(<span class="op">|</span><span class="op">|</span> <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">POOL_DATA</span>.<span class="ident">is_set</span>())),
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)<span class="question-mark">?</span>;
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<span class="comment">// Once we've returned, `pool_data` is no longer borrowed.</span>
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<span class="ident">drop</span>(<span class="ident">pool_data</span>);
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<span class="prelude-val">Ok</span>(())
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}</pre></div>
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</div></div><h3 id='impl-3' class='impl'><code class='in-band'>impl<S> <a class="struct" href="../rayon_core/struct.ThreadPoolBuilder.html" title="struct rayon_core::ThreadPoolBuilder">ThreadPoolBuilder</a><S></code><a href='#impl-3' class='anchor'></a><a class='srclink' href='../src/rayon_core/lib.rs.html#313-576' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.spawn_handler' class="method"><code id='spawn_handler.v'>pub fn <a href='#method.spawn_handler' class='fnname'>spawn_handler</a><F>(self, spawn: F) -> <a class="struct" href="../rayon_core/struct.ThreadPoolBuilder.html" title="struct rayon_core::ThreadPoolBuilder">ThreadPoolBuilder</a><CustomSpawn<F>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="struct" href="../rayon_core/struct.ThreadBuilder.html" title="struct rayon_core::ThreadBuilder">ThreadBuilder</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/std/io/error/type.Result.html" title="type std::io::error::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>>, </span></code><a class='srclink' href='../src/rayon_core/lib.rs.html#368-383' title='goto source code'>[src]</a></h4><div class='docblock'><p>Set a custom function for spawning threads.</p>
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<p>Note that the threads will not exit until after the pool is dropped. It
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is up to the caller to wait for thread termination if that is important
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for any invariants. For instance, threads created in <a href="https://docs.rs/crossbeam/0.7/crossbeam/fn.scope.html"><code>crossbeam::scope</code></a>
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will be joined before that scope returns, and this will block indefinitely
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if the pool is leaked. Furthermore, the global thread pool doesn't terminate
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until the entire process exits!</p>
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<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
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<p>A minimal spawn handler just needs to call <code>run()</code> from an independent thread.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">fn</span> <span class="ident">main</span>() <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">rayon</span>::<span class="ident">ThreadPoolBuildError</span><span class="op">></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>()
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.<span class="ident">spawn_handler</span>(<span class="op">|</span><span class="ident">thread</span><span class="op">|</span> {
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<span class="ident">std</span>::<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">thread</span>.<span class="ident">run</span>());
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<span class="prelude-val">Ok</span>(())
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})
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.<span class="ident">build</span>()<span class="question-mark">?</span>;
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<span class="ident">pool</span>.<span class="ident">install</span>(<span class="op">|</span><span class="op">|</span> <span class="macro">println</span><span class="macro">!</span>(<span class="string">"Hello from my custom thread!"</span>));
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<span class="prelude-val">Ok</span>(())
|
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|
}</pre></div>
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<p>The default spawn handler sets the name and stack size if given, and propagates
|
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any errors from the thread builder.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
|
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|
<span class="kw">fn</span> <span class="ident">main</span>() <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">rayon</span>::<span class="ident">ThreadPoolBuildError</span><span class="op">></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>()
|
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|
.<span class="ident">spawn_handler</span>(<span class="op">|</span><span class="ident">thread</span><span class="op">|</span> {
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|
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">std</span>::<span class="ident">thread</span>::<span class="ident">Builder</span>::<span class="ident">new</span>();
|
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|
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">name</span>) <span class="op">=</span> <span class="ident">thread</span>.<span class="ident">name</span>() {
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|
<span class="ident">b</span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">name</span>(<span class="ident">name</span>.<span class="ident">to_owned</span>());
|
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|
}
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|
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">stack_size</span>) <span class="op">=</span> <span class="ident">thread</span>.<span class="ident">stack_size</span>() {
|
|
|
<span class="ident">b</span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">stack_size</span>(<span class="ident">stack_size</span>);
|
|
|
}
|
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|
<span class="ident">b</span>.<span class="ident">spawn</span>(<span class="op">|</span><span class="op">|</span> <span class="ident">thread</span>.<span class="ident">run</span>())<span class="question-mark">?</span>;
|
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|
<span class="prelude-val">Ok</span>(())
|
|
|
})
|
|
|
.<span class="ident">build</span>()<span class="question-mark">?</span>;
|
|
|
|
|
|
<span class="ident">pool</span>.<span class="ident">install</span>(<span class="op">|</span><span class="op">|</span> <span class="macro">println</span><span class="macro">!</span>(<span class="string">"Hello from my fully custom thread!"</span>));
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|
<span class="prelude-val">Ok</span>(())
|
|
|
}</pre></div>
|
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|
</div><h4 id='method.thread_name' class="method"><code id='thread_name.v'>pub fn <a href='#method.thread_name' class='fnname'>thread_name</a><F>(self, closure: F) -> Self <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a> + 'static, </span></code><a class='srclink' href='../src/rayon_core/lib.rs.html#424-430' title='goto source code'>[src]</a></h4><div class='docblock'><p>Set a closure which takes a thread index and returns
|
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|
the thread's name.</p>
|
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|
</div><h4 id='method.num_threads' class="method"><code id='num_threads.v'>pub fn <a href='#method.num_threads' class='fnname'>num_threads</a>(self, num_threads: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> Self</code><a class='srclink' href='../src/rayon_core/lib.rs.html#458-461' title='goto source code'>[src]</a></h4><div class='docblock'><p>Set the number of threads to be used in the rayon threadpool.</p>
|
|
|
<p>If you specify a non-zero number of threads using this
|
|
|
function, then the resulting thread-pools are guaranteed to
|
|
|
start at most this number of threads.</p>
|
|
|
<p>If <code>num_threads</code> is 0, or you do not call this function, then
|
|
|
the Rayon runtime will select the number of threads
|
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|
automatically. At present, this is based on the
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<code>RAYON_NUM_THREADS</code> environment variable (if set),
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or the number of logical CPUs (otherwise).
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In the future, however, the default behavior may
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change to dynamically add or remove threads as needed.</p>
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<p><strong>Future compatibility warning:</strong> Given the default behavior
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may change in the future, if you wish to rely on a fixed
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number of threads, you should use this function to specify
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that number. To reproduce the current default behavior, you
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may wish to use the <a href="https://crates.io/crates/num_cpus"><code>num_cpus</code>
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crate</a> to query the number
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of CPUs dynamically.</p>
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<p><strong>Old environment variable:</strong> <code>RAYON_NUM_THREADS</code> is a one-to-one
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replacement of the now deprecated <code>RAYON_RS_NUM_CPUS</code> environment
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variable. If both variables are specified, <code>RAYON_NUM_THREADS</code> will
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be prefered.</p>
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</div><h4 id='method.panic_handler' class="method"><code id='panic_handler.v'>pub fn <a href='#method.panic_handler' class='fnname'>panic_handler</a><H>(self, panic_handler: H) -> Self <span class="where fmt-newline">where<br> H: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a>>) + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code><a class='srclink' href='../src/rayon_core/lib.rs.html#482-488' title='goto source code'>[src]</a></h4><div class='docblock'><p>Normally, whenever Rayon catches a panic, it tries to
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propagate it to someplace sensible, to try and reflect the
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semantics of sequential execution. But in some cases,
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particularly with the <code>spawn()</code> APIs, there is no
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obvious place where we should propagate the panic to.
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In that case, this panic handler is invoked.</p>
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<p>If no panic handler is set, the default is to abort the
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process, under the principle that panics should not go
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unobserved.</p>
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<p>If the panic handler itself panics, this will abort the
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|
process. To prevent this, wrap the body of your panic handler
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|
in a call to <code>std::panic::catch_unwind()</code>.</p>
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</div><h4 id='method.stack_size' class="method"><code id='stack_size.v'>pub fn <a href='#method.stack_size' class='fnname'>stack_size</a>(self, stack_size: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -> Self</code><a class='srclink' href='../src/rayon_core/lib.rs.html#496-499' title='goto source code'>[src]</a></h4><div class='docblock'><p>Set the stack size of the worker threads</p>
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</div><h4 id='method.breadth_first' class="method"><code id='breadth_first.v'>pub fn <a href='#method.breadth_first' class='fnname'>breadth_first</a>(self) -> Self</code><a class='srclink' href='../src/rayon_core/lib.rs.html#530-533' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab deprecated'>Deprecated: <p>use <code>scope_fifo</code> and <code>spawn_fifo</code> for similar effect</p>
|
|
|
</div></div><div class='docblock'><p><strong>(DEPRECATED)</strong> Suggest to worker threads that they execute
|
|
|
spawned jobs in a "breadth-first" fashion.</p>
|
|
|
<p>Typically, when a worker thread is idle or blocked, it will
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|
|
attempt to execute the job from the <em>top</em> of its local deque of
|
|
|
work (i.e., the job most recently spawned). If this flag is set
|
|
|
to true, however, workers will prefer to execute in a
|
|
|
<em>breadth-first</em> fashion -- that is, they will search for jobs at
|
|
|
the <em>bottom</em> of their local deque. (At present, workers <em>always</em>
|
|
|
steal from the bottom of other worker's deques, regardless of
|
|
|
the setting of this flag.)</p>
|
|
|
<p>If you think of the tasks as a tree, where a parent task
|
|
|
spawns its children in the tree, then this flag loosely
|
|
|
corresponds to doing a breadth-first traversal of the tree,
|
|
|
whereas the default would be to do a depth-first traversal.</p>
|
|
|
<p><strong>Note that this is an "execution hint".</strong> Rayon's task
|
|
|
execution is highly dynamic and the precise order in which
|
|
|
independent tasks are executed is not intended to be
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|
|
guaranteed.</p>
|
|
|
<p>This <code>breadth_first()</code> method is now deprecated per <a href="https://github.com/rayon-rs/rfcs/blob/master/accepted/rfc0001-scope-scheduling.md">RFC #1</a>,
|
|
|
and in the future its effect may be removed. Consider using
|
|
|
<a href="fn.scope_fifo.html"><code>scope_fifo()</code></a> for a similar effect.</p>
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|
|
</div><h4 id='method.start_handler' class="method"><code id='start_handler.v'>pub fn <a href='#method.start_handler' class='fnname'>start_handler</a><H>(self, start_handler: H) -> Self <span class="where fmt-newline">where<br> H: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code><a class='srclink' href='../src/rayon_core/lib.rs.html#550-556' title='goto source code'>[src]</a></h4><div class='docblock'><p>Set a callback to be invoked on thread start.</p>
|
|
|
<p>The closure is passed the index of the thread on which it is invoked.
|
|
|
Note that this same closure may be invoked multiple times in parallel.
|
|
|
If this closure panics, the panic will be passed to the panic handler.
|
|
|
If that handler returns, then startup will continue normally.</p>
|
|
|
</div><h4 id='method.exit_handler' class="method"><code id='exit_handler.v'>pub fn <a href='#method.exit_handler' class='fnname'>exit_handler</a><H>(self, exit_handler: H) -> Self <span class="where fmt-newline">where<br> H: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static, </span></code><a class='srclink' href='../src/rayon_core/lib.rs.html#569-575' title='goto source code'>[src]</a></h4><div class='docblock'><p>Set a callback to be invoked on thread exit.</p>
|
|
|
<p>The closure is passed the index of the thread on which it is invoked.
|
|
|
Note that this same closure may be invoked multiple times in parallel.
|
|
|
If this closure panics, the panic will be passed to the panic handler.
|
|
|
If that handler returns, then the thread will exit normally.</p>
|
|
|
</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-Default' class='impl'><code class='in-band'>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="../rayon_core/struct.ThreadPoolBuilder.html" title="struct rayon_core::ThreadPoolBuilder">ThreadPoolBuilder</a></code><a href='#impl-Default' class='anchor'></a><a class='srclink' href='../src/rayon_core/lib.rs.html#186-199' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.default' class="method hidden"><code id='default.v'>fn <a href='https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default' class='fnname'>default</a>() -> Self</code><a class='srclink' href='../src/rayon_core/lib.rs.html#187-198' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Returns the "default value" for a type. <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default">Read more</a></p>
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</div></div><h3 id='impl-Debug' class='impl'><code class='in-band'>impl<S> <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_core/struct.ThreadPoolBuilder.html" title="struct rayon_core::ThreadPoolBuilder">ThreadPoolBuilder</a><S></code><a href='#impl-Debug' class='anchor'></a><a class='srclink' href='../src/rayon_core/lib.rs.html#685-721' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.fmt' class="method hidden"><code id='fmt.v'>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &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="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code><a class='srclink' href='../src/rayon_core/lib.rs.html#686-720' title='goto source code'>[src]</a></h4><div class='docblock hidden'><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></div><h2 id='synthetic-implementations' class='small-section-header'>Auto Trait Implementations<a href='#synthetic-implementations' class='anchor'></a></h2><div id='synthetic-implementations-list'><h3 id='impl-Send' class='impl'><code class='in-band'>impl<S = DefaultSpawn> !<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../rayon_core/struct.ThreadPoolBuilder.html" title="struct rayon_core::ThreadPoolBuilder">ThreadPoolBuilder</a><S></code><a href='#impl-Send' class='anchor'></a></h3><div class='impl-items'></div><h3 id='impl-Unpin' class='impl'><code class='in-band'>impl<S> <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="../rayon_core/struct.ThreadPoolBuilder.html" title="struct rayon_core::ThreadPoolBuilder">ThreadPoolBuilder</a><S> <span class="where fmt-newline">where<br> S: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a>, </span></code><a href='#impl-Unpin' class='anchor'></a></h3><div class='impl-items'></div><h3 id='impl-Sync' class='impl'><code class='in-band'>impl<S = DefaultSpawn> !<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../rayon_core/struct.ThreadPoolBuilder.html" title="struct rayon_core::ThreadPoolBuilder">ThreadPoolBuilder</a><S></code><a href='#impl-Sync' class='anchor'></a></h3><div class='impl-items'></div><h3 id='impl-UnwindSafe' class='impl'><code class='in-band'>impl<S = DefaultSpawn> !<a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.UnwindSafe.html" title="trait std::panic::UnwindSafe">UnwindSafe</a> for <a class="struct" href="../rayon_core/struct.ThreadPoolBuilder.html" title="struct rayon_core::ThreadPoolBuilder">ThreadPoolBuilder</a><S></code><a href='#impl-UnwindSafe' class='anchor'></a></h3><div class='impl-items'></div><h3 id='impl-RefUnwindSafe' class='impl'><code class='in-band'>impl<S = DefaultSpawn> !<a class="trait" href="https://doc.rust-lang.org/nightly/std/panic/trait.RefUnwindSafe.html" title="trait std::panic::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="../rayon_core/struct.ThreadPoolBuilder.html" title="struct rayon_core::ThreadPoolBuilder">ThreadPoolBuilder</a><S></code><a href='#impl-RefUnwindSafe' class='anchor'></a></h3><div class='impl-items'></div></div><h2 id='blanket-implementations' class='small-section-header'>Blanket Implementations<a href='#blanket-implementations' class='anchor'></a></h2><div id='blanket-implementations-list'><h3 id='impl-Into%3CU%3E' class='impl'><code class='in-band'>impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>, </span></code><a href='#impl-Into%3CU%3E' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#544-549' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.into' class="method hidden"><code id='into.v'>fn <a href='https://doc.rust-lang.org/nightly/core/convert/trait.Into.html#tymethod.into' class='fnname'>into</a>(self) -> U</code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#546-548' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div><h3 id='impl-From%3CT%3E' class='impl'><code class='in-band'>impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</code><a href='#impl-From%3CT%3E' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#553-555' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.from' class="method hidden"><code id='from.v'>fn <a href='https://doc.rust-lang.org/nightly/core/convert/trait.From.html#tymethod.from' class='fnname'>from</a>(t: T) -> T</code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#554' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div><h3 id='impl-TryFrom%3CU%3E' class='impl'><code class='in-band'>impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>, </span></code><a href='#impl-TryFrom%3CU%3E' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#572-578' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Error' class="type"><code id='Error.t'>type <a href='https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error' class="type">Error</a> = <a class="enum" href="https://doc.rust-lang.org/nightly/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
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</div><h4 id='method.try_from' class="method hidden"><code id='try_from.v'>fn <a href='https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#tymethod.try_from' class='fnname'>try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#575-577' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div><h3 id='impl-TryInto%3CU%3E' class='impl'><code class='in-band'>impl<T, U> <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T <span class="where fmt-newline">where<br> U: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>, </span></code><a href='#impl-TryInto%3CU%3E' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#560-567' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Error-1' class="type"><code id='Error.t-1'>type <a href='https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#associatedtype.Error' class="type">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></code></h4><div class='docblock'><p>The type returned in the event of a conversion error.</p>
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</div><h4 id='method.try_into' class="method hidden"><code id='try_into.v'>fn <a href='https://doc.rust-lang.org/nightly/core/convert/trait.TryInto.html#tymethod.try_into' class='fnname'>try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/convert.rs.html#564-566' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Performs the conversion.</p>
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</div></div><h3 id='impl-BorrowMut%3CT%3E' class='impl'><code class='in-band'>impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T <span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href='#impl-BorrowMut%3CT%3E' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#218-220' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.borrow_mut' class="method hidden"><code id='borrow_mut.v'>fn <a href='https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut' class='fnname'>borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>T</code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#219' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
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</div></div><h3 id='impl-Borrow%3CT%3E' class='impl'><code class='in-band'>impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T <span class="where fmt-newline">where<br> T: ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href='#impl-Borrow%3CT%3E' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#213-215' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.borrow' class="method hidden"><code id='borrow.v'>fn <a href='https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow' class='fnname'>borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T</code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/borrow.rs.html#214' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
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</div></div><h3 id='impl-Any' class='impl'><code class='in-band'>impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T <span class="where fmt-newline">where<br> T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></code><a href='#impl-Any' class='anchor'></a><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/any.rs.html#100-102' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='method.type_id' class="method hidden"><code id='type_id.v'>fn <a href='https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id' class='fnname'>type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></code><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/any.rs.html#101' title='goto source code'>[src]</a></h4><div class='docblock hidden'><p>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/nightly/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
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