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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 `rayon_core` crate."><meta name="keywords" content="rust, rustlang, rust-lang, rayon_core"><title>rayon_core - 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 mod"><!--[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'>Crate rayon_core</p><div class="sidebar-elems"><a id='all-types' href='all.html'><p>See all rayon_core's items</p></a><div class="block items"><ul><li><a href="#structs">Structs</a></li><li><a href="#functions">Functions</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'rayon_core', ty: 'mod', relpath: '../'};</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#1-765' title='goto source code'>[src]</a></span><span class='in-band'>Crate <a class="mod" href=''>rayon_core</a></span></h1><div class='docblock'><p><a href="https://github.com/rayon-rs/rayon/issues/231">Under construction</a></p>
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<h2 id="restricting-multiple-versions" class="section-header"><a href="#restricting-multiple-versions">Restricting multiple versions</a></h2>
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<p>In order to ensure proper coordination between threadpools, and especially
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to make sure there's only one global threadpool, <code>rayon-core</code> is actively
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restricted from building multiple versions of itself into a single target.
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You may see a build error like this in violation:</p>
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<pre><code class="language-text">error: native library `rayon-core` is being linked to by more
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than one package, and can only be linked to by one package
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</code></pre>
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<p>While we strive to keep <code>rayon-core</code> semver-compatible, it's still
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possible to arrive at this situation if different crates have overly
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restrictive tilde or inequality requirements for <code>rayon-core</code>. The
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conflicting requirements will need to be resolved before the build will
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succeed.</p>
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</div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table><tr class='module-item'><td><a class="struct" href="struct.Configuration.html" title='rayon_core::Configuration struct'>Configuration</a></td><td class='docblock-short'><span class="stab deprecated">Deprecated</span><p>Contains the rayon thread pool configuration. Use <a href="struct.ThreadPoolBuilder.html"><code>ThreadPoolBuilder</code></a> instead.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.FnContext.html" title='rayon_core::FnContext struct'>FnContext</a></td><td class='docblock-short'><p>Provides the calling context to a closure called by <code>join_context</code>.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.Scope.html" title='rayon_core::Scope struct'>Scope</a></td><td class='docblock-short'><p>Represents a fork-join scope which can be used to spawn any number of tasks.
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See <a href="fn.scope.html"><code>scope()</code></a> for more information.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.ScopeFifo.html" title='rayon_core::ScopeFifo struct'>ScopeFifo</a></td><td class='docblock-short'><p>Represents a fork-join scope which can be used to spawn any number of tasks.
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Those spawned from the same thread are prioritized in relative FIFO order.
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See <a href="fn.scope_fifo.html"><code>scope_fifo()</code></a> for more information.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.ThreadBuilder.html" title='rayon_core::ThreadBuilder struct'>ThreadBuilder</a></td><td class='docblock-short'><p>Thread builder used for customization via
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<a href="struct.ThreadPoolBuilder.html#method.spawn_handler"><code>ThreadPoolBuilder::spawn_handler</code></a>.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.ThreadPool.html" title='rayon_core::ThreadPool struct'>ThreadPool</a></td><td class='docblock-short'><p>Represents a user created <a href="https://en.wikipedia.org/wiki/Thread_pool">thread-pool</a>.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.ThreadPoolBuildError.html" title='rayon_core::ThreadPoolBuildError struct'>ThreadPoolBuildError</a></td><td class='docblock-short'><p>Error when initializing a thread pool.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.ThreadPoolBuilder.html" title='rayon_core::ThreadPoolBuilder struct'>ThreadPoolBuilder</a></td><td class='docblock-short'><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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</td></tr></table><h2 id='functions' class='section-header'><a href="#functions">Functions</a></h2>
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<table><tr class='module-item'><td><a class="fn" href="fn.current_num_threads.html" title='rayon_core::current_num_threads fn'>current_num_threads</a></td><td class='docblock-short'><p>Returns the number of threads in the current registry. If this
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code is executing within a Rayon thread-pool, then this will be
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the number of threads for the thread-pool of the current
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thread. Otherwise, it will be the number of threads for the global
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thread-pool.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.current_thread_has_pending_tasks.html" title='rayon_core::current_thread_has_pending_tasks fn'>current_thread_has_pending_tasks</a></td><td class='docblock-short'><p>If called from a Rayon worker thread, indicates whether that
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thread's local deque still has pending tasks. Otherwise, returns
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<code>None</code>. For more information, see <a href="struct.ThreadPool.html#method.current_thread_has_pending_tasks">the
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<code>ThreadPool::current_thread_has_pending_tasks()</code> method</a>.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.current_thread_index.html" title='rayon_core::current_thread_index fn'>current_thread_index</a></td><td class='docblock-short'><p>If called from a Rayon worker thread, returns the index of that
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thread within its current pool; if not called from a Rayon thread,
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returns <code>None</code>.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.initialize.html" title='rayon_core::initialize fn'>initialize</a></td><td class='docblock-short'><span class="stab deprecated">Deprecated</span><p>Deprecated in favor of <code>ThreadPoolBuilder::build_global</code>.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.join.html" title='rayon_core::join fn'>join</a></td><td class='docblock-short'><p>Takes two closures and <em>potentially</em> runs them in parallel. It
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returns a pair of the results from those closures.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.join_context.html" title='rayon_core::join_context fn'>join_context</a></td><td class='docblock-short'><p>Identical to <code>join</code>, except that the closures have a parameter
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that provides context for the way the closure has been called,
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especially indicating whether they're executing on a different
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thread than where <code>join_context</code> was called. This will occur if
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the second job is stolen by a different thread, or if
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<code>join_context</code> was called from outside the thread pool to begin
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with.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.scope.html" title='rayon_core::scope fn'>scope</a></td><td class='docblock-short'><p>Create a "fork-join" scope <code>s</code> and invokes the closure with a
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reference to <code>s</code>. This closure can then spawn asynchronous tasks
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into <code>s</code>. Those tasks may run asynchronously with respect to the
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closure; they may themselves spawn additional tasks into <code>s</code>. When
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the closure returns, it will block until all tasks that have been
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spawned into <code>s</code> complete.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.scope_fifo.html" title='rayon_core::scope_fifo fn'>scope_fifo</a></td><td class='docblock-short'><p>Create a "fork-join" scope <code>s</code> with FIFO order, and invokes the
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closure with a reference to <code>s</code>. This closure can then spawn
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asynchronous tasks into <code>s</code>. Those tasks may run asynchronously with
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respect to the closure; they may themselves spawn additional tasks
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into <code>s</code>. When the closure returns, it will block until all tasks
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that have been spawned into <code>s</code> complete.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.spawn.html" title='rayon_core::spawn fn'>spawn</a></td><td class='docblock-short'><p>Fires off a task into the Rayon threadpool in the "static" or
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"global" scope. Just like a standard thread, this task is not
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tied to the current stack frame, and hence it cannot hold any
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references other than those with <code>'static</code> lifetime. If you want
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to spawn a task that references stack data, use <a href="fn.scope.html">the <code>scope()</code>
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function</a> to create a scope.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.spawn_fifo.html" title='rayon_core::spawn_fifo fn'>spawn_fifo</a></td><td class='docblock-short'><p>Fires off a task into the Rayon threadpool in the "static" or
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"global" scope. Just like a standard thread, this task is not
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tied to the current stack frame, and hence it cannot hold any
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references other than those with <code>'static</code> lifetime. If you want
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to spawn a task that references stack data, use <a href="fn.scope_fifo.html">the <code>scope_fifo()</code>
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function</a> to create a scope.</p>
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</td></tr></table></section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g., <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g., <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g., <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../";window.currentCrate = "rayon_core";</script><script src="../aliases.js"></script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html>
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