<!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 `/home/sangenya/.cargo/registry/src/github.com-1ecc6299db9ec823/crossbeam-utils-0.8.5/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</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="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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</pre><pre class="rust">
<span class="doccomment">//! Miscellaneous tools for concurrent programming.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Atomics</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * [`AtomicCell`], a thread-safe mutable memory location.</span>
<span class="doccomment">//! * [`AtomicConsume`], for reading from primitive atomic types with "consume" ordering.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Thread synchronization</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * [`Parker`], a thread parking primitive.</span>
<span class="doccomment">//! * [`ShardedLock`], a sharded reader-writer lock with fast concurrent reads.</span>
<span class="doccomment">//! * [`WaitGroup`], for synchronizing the beginning or end of some computation.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Utilities</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * [`Backoff`], for exponential backoff in spin loops.</span>
<span class="doccomment">//! * [`CachePadded`], for padding and aligning a value to the length of a cache line.</span>
<span class="doccomment">//! * [`scope`], for spawning threads that borrow local variables from the stack.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`AtomicCell`]: atomic::AtomicCell</span>
<span class="doccomment">//! [`AtomicConsume`]: atomic::AtomicConsume</span>
<span class="doccomment">//! [`Parker`]: sync::Parker</span>
<span class="doccomment">//! [`ShardedLock`]: sync::ShardedLock</span>
<span class="doccomment">//! [`WaitGroup`]: sync::WaitGroup</span>
<span class="doccomment">//! [`scope`]: thread::scope</span>
<span class="attribute">#![<span class="ident">doc</span>(<span class="ident">test</span>(
<span class="ident">no_crate_inject</span>,
<span class="ident">attr</span>(
<span class="ident">deny</span>(<span class="ident">warnings</span>, <span class="ident">rust_2018_idioms</span>),
<span class="ident">allow</span>(<span class="ident">dead_code</span>, <span class="ident">unused_assignments</span>, <span class="ident">unused_variables</span>)
)
))]</span>
<span class="attribute">#![<span class="ident">warn</span>(
<span class="ident">missing_docs</span>,
<span class="ident">missing_debug_implementations</span>,
<span class="ident">rust_2018_idioms</span>,
<span class="ident">unreachable_pub</span>
)]</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>), <span class="ident">no_std</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">crossbeam_loom</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_imports</span>)]</span>
<span class="kw">mod</span> <span class="ident">primitive</span> {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod</span> <span class="ident">sync</span> {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod</span> <span class="ident">atomic</span> {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use</span> <span class="ident">loom::sync::atomic::spin_loop_hint</span>;
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use</span> <span class="ident">loom::sync::atomic</span>::{
<span class="ident">AtomicBool</span>, <span class="ident">AtomicI16</span>, <span class="ident">AtomicI32</span>, <span class="ident">AtomicI64</span>, <span class="ident">AtomicI8</span>, <span class="ident">AtomicIsize</span>, <span class="ident">AtomicU16</span>,
<span class="ident">AtomicU32</span>, <span class="ident">AtomicU64</span>, <span class="ident">AtomicU8</span>, <span class="ident">AtomicUsize</span>,
};
<span class="comment">// FIXME: loom does not support compiler_fence at the moment.</span>
<span class="comment">// https://github.com/tokio-rs/loom/issues/117</span>
<span class="comment">// we use fence as a stand-in for compiler_fence for the time being.</span>
<span class="comment">// this may miss some races since fence is stronger than compiler_fence,</span>
<span class="comment">// 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> <span class="ident">loom::sync::atomic::fence</span> <span class="kw">as</span> <span class="ident">compiler_fence</span>;
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use</span> <span class="ident">loom::sync</span>::{<span class="ident">Arc</span>, <span class="ident">Condvar</span>, <span class="ident">Mutex</span>};
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">crossbeam_loom</span>))]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_imports</span>)]</span>
<span class="kw">mod</span> <span class="ident">primitive</span> {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod</span> <span class="ident">sync</span> {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod</span> <span class="ident">atomic</span> {
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use</span> <span class="ident">core::sync::atomic::compiler_fence</span>;
<span class="comment">// TODO(taiki-e): once we bump the minimum required Rust version to 1.49+,</span>
<span class="comment">// use [`core::hint::spin_loop`] instead.</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">deprecated</span>)]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use</span> <span class="ident">core::sync::atomic::spin_loop_hint</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">crossbeam_no_atomic</span>))]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use</span> <span class="ident">core::sync::atomic</span>::{
<span class="ident">AtomicBool</span>, <span class="ident">AtomicI16</span>, <span class="ident">AtomicI32</span>, <span class="ident">AtomicI8</span>, <span class="ident">AtomicIsize</span>, <span class="ident">AtomicU16</span>, <span class="ident">AtomicU32</span>,
<span class="ident">AtomicU8</span>, <span class="ident">AtomicUsize</span>,
};
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">crossbeam_no_atomic_64</span>))]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use</span> <span class="ident">core::sync::atomic</span>::{<span class="ident">AtomicI64</span>, <span class="ident">AtomicU64</span>};
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span>
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use</span> <span class="ident">std::sync</span>::{<span class="ident">Arc</span>, <span class="ident">Condvar</span>, <span class="ident">Mutex</span>};
}
}
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">atomic</span>;
<span class="kw">mod</span> <span class="ident">cache_padded</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="kw">crate</span><span class="ident">::cache_padded::CachePadded</span>;
<span class="kw">mod</span> <span class="ident">backoff</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="kw">crate</span><span class="ident">::backoff::Backoff</span>;
<span class="kw">use</span> <span class="ident">cfg_if::cfg_if</span>;
<span class="macro">cfg_if!</span> {
<span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span> {
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">sync</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">crossbeam_loom</span>))]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">thread</span>;
}
}
</pre></div>
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