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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 `current_thread_index` fn in crate `rayon`."><meta name="keywords" content="rust, rustlang, rust-lang, current_thread_index"><title>rayon::current_thread_index - 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 fn"><!--[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/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class='location'><a href='index.html'>rayon</a></p><script>window.sidebarCurrent = {name: 'current_thread_index', ty: 'fn', 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/thread_pool/mod.rs.html#318-323' title='goto source code'>[src]</a></span><span class='in-band'>Function <a href='index.html'>rayon</a>::<wbr><a class="fn" href=''>current_thread_index</a></span></h1><pre class='rust fn'>pub fn current_thread_index() -> <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>></pre><div class='docblock'><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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<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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<p>See also: [the <code>ThreadPool::current_thread_index()</code> method].</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>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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