| <!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/tokio-1.28.2/src/loom/std/atomic_usize.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>atomic_usize.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="../../../../tokio/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="../../../../tokio/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="kw">use </span>std::cell::UnsafeCell; |
| <span class="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::ops; |
| |
| <span class="doccomment">/// `AtomicUsize` providing an additional `unsync_load` function. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>AtomicUsize { |
| inner: UnsafeCell<std::sync::atomic::AtomicUsize>, |
| } |
| |
| <span class="kw">unsafe impl </span>Send <span class="kw">for </span>AtomicUsize {} |
| <span class="kw">unsafe impl </span>Sync <span class="kw">for </span>AtomicUsize {} |
| |
| <span class="kw">impl </span>AtomicUsize { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const fn </span>new(val: usize) -> AtomicUsize { |
| <span class="kw">let </span>inner = UnsafeCell::new(std::sync::atomic::AtomicUsize::new(val)); |
| AtomicUsize { inner } |
| } |
| |
| <span class="doccomment">/// Performs an unsynchronized load. |
| /// |
| /// # Safety |
| /// |
| /// All mutations must have happened before the unsynchronized load. |
| /// Additionally, there must be no concurrent mutations. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">unsafe fn </span>unsync_load(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| core::ptr::read(<span class="self">self</span>.inner.get() <span class="kw">as </span><span class="kw-2">*const </span>usize) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>with_mut<R>(<span class="kw-2">&mut </span><span class="self">self</span>, f: <span class="kw">impl </span>FnOnce(<span class="kw-2">&mut </span>usize) -> R) -> R { |
| <span class="comment">// safety: we have mutable access |
| </span>f(<span class="kw">unsafe </span>{ (<span class="kw-2">*</span><span class="self">self</span>.inner.get()).get_mut() }) |
| } |
| } |
| |
| <span class="kw">impl </span>ops::Deref <span class="kw">for </span>AtomicUsize { |
| <span class="kw">type </span>Target = std::sync::atomic::AtomicUsize; |
| |
| <span class="kw">fn </span>deref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="self">Self</span>::Target { |
| <span class="comment">// safety: it is always safe to access `&self` fns on the inner value as |
| // we never perform unsafe mutations. |
| </span><span class="kw">unsafe </span>{ <span class="kw-2">&*</span><span class="self">self</span>.inner.get() } |
| } |
| } |
| |
| <span class="kw">impl </span>ops::DerefMut <span class="kw">for </span>AtomicUsize { |
| <span class="kw">fn </span>deref_mut(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="kw-2">&mut </span><span class="self">Self</span>::Target { |
| <span class="comment">// safety: we hold `&mut self` |
| </span><span class="kw">unsafe </span>{ <span class="kw-2">&mut *</span><span class="self">self</span>.inner.get() } |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>AtomicUsize { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, fmt: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| (<span class="kw-2">**</span><span class="self">self</span>).fmt(fmt) |
| } |
| } |
| </code></pre></div> |
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