| <!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="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/crossbeam-utils-0.8.15/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../crossbeam_utils/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../crossbeam_utils/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="doccomment">//! Miscellaneous tools for concurrent programming. |
| //! |
| //! ## Atomics |
| //! |
| //! * [`AtomicCell`], a thread-safe mutable memory location. |
| //! * [`AtomicConsume`], for reading from primitive atomic types with "consume" ordering. |
| //! |
| //! ## Thread synchronization |
| //! |
| //! * [`Parker`], a thread parking primitive. |
| //! * [`ShardedLock`], a sharded reader-writer lock with fast concurrent reads. |
| //! * [`WaitGroup`], for synchronizing the beginning or end of some computation. |
| //! |
| //! ## Utilities |
| //! |
| //! * [`Backoff`], for exponential backoff in spin loops. |
| //! * [`CachePadded`], for padding and aligning a value to the length of a cache line. |
| //! * [`scope`], for spawning threads that borrow local variables from the stack. |
| //! |
| //! [`AtomicCell`]: atomic::AtomicCell |
| //! [`AtomicConsume`]: atomic::AtomicConsume |
| //! [`Parker`]: sync::Parker |
| //! [`ShardedLock`]: sync::ShardedLock |
| //! [`WaitGroup`]: sync::WaitGroup |
| //! [`scope`]: thread::scope |
| |
| </span><span class="attribute">#![doc(test( |
| no_crate_inject, |
| attr( |
| deny(warnings, rust_2018_idioms), |
| allow(dead_code, unused_assignments, unused_variables) |
| ) |
| ))] |
| #![warn( |
| missing_docs, |
| missing_debug_implementations, |
| rust_2018_idioms, |
| unreachable_pub |
| )] |
| #![cfg_attr(not(feature = <span class="string">"std"</span>), no_std)] |
| |
| #[cfg(crossbeam_loom)] |
| #[allow(unused_imports)] |
| </span><span class="kw">mod </span>primitive { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>sync { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>atomic { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>loom::sync::atomic::spin_loop_hint; |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>loom::sync::atomic::{ |
| AtomicBool, AtomicI16, AtomicI32, AtomicI64, AtomicI8, AtomicIsize, AtomicU16, |
| AtomicU32, AtomicU64, AtomicU8, AtomicUsize, |
| }; |
| |
| <span class="comment">// FIXME: loom does not support compiler_fence at the moment. |
| // https://github.com/tokio-rs/loom/issues/117 |
| // we use fence as a stand-in for compiler_fence for the time being. |
| // this may miss some races since fence is stronger than compiler_fence, |
| // but it's the best we can do for the time being. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>loom::sync::atomic::fence <span class="kw">as </span>compiler_fence; |
| } |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>loom::sync::{Arc, Condvar, Mutex}; |
| } |
| } |
| <span class="attribute">#[cfg(not(crossbeam_loom))] |
| #[allow(unused_imports)] |
| </span><span class="kw">mod </span>primitive { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>sync { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>atomic { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>core::sync::atomic::compiler_fence; |
| <span class="comment">// TODO(taiki-e): once we bump the minimum required Rust version to 1.49+, |
| // use [`core::hint::spin_loop`] instead. |
| </span><span class="attribute">#[allow(deprecated)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>core::sync::atomic::spin_loop_hint; |
| <span class="attribute">#[cfg(not(crossbeam_no_atomic))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>core::sync::atomic::{ |
| AtomicBool, AtomicI16, AtomicI32, AtomicI8, AtomicIsize, AtomicU16, AtomicU32, |
| AtomicU8, AtomicUsize, |
| }; |
| <span class="attribute">#[cfg(not(crossbeam_no_atomic_64))] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>core::sync::atomic::{AtomicI64, AtomicU64}; |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>std::sync::{Arc, Condvar, Mutex}; |
| } |
| } |
| |
| <span class="kw">pub mod </span>atomic; |
| |
| <span class="kw">mod </span>cache_padded; |
| <span class="kw">pub use </span><span class="kw">crate</span>::cache_padded::CachePadded; |
| |
| <span class="kw">mod </span>backoff; |
| <span class="kw">pub use </span><span class="kw">crate</span>::backoff::Backoff; |
| |
| <span class="kw">use </span>cfg_if::cfg_if; |
| |
| <span class="macro">cfg_if! </span>{ |
| <span class="kw">if </span><span class="attribute">#[cfg(feature = <span class="string">"std"</span>)] </span>{ |
| <span class="kw">pub mod </span>sync; |
| |
| <span class="attribute">#[cfg(not(crossbeam_loom))] |
| </span><span class="kw">pub mod </span>thread; |
| } |
| } |
| </code></pre></div> |
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