| <!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/util/atomic_cell.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>atomic_cell.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> |
| <span id="2">2</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::loom::sync::atomic::AtomicPtr; |
| |
| <span class="kw">use </span>std::ptr; |
| <span class="kw">use </span>std::sync::atomic::Ordering::AcqRel; |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>AtomicCell<T> { |
| data: AtomicPtr<T>, |
| } |
| |
| <span class="kw">unsafe impl</span><T: Send> Send <span class="kw">for </span>AtomicCell<T> {} |
| <span class="kw">unsafe impl</span><T: Send> Sync <span class="kw">for </span>AtomicCell<T> {} |
| |
| <span class="kw">impl</span><T> AtomicCell<T> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(data: <span class="prelude-ty">Option</span><Box<T>>) -> AtomicCell<T> { |
| AtomicCell { |
| data: AtomicPtr::new(to_raw(data)), |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>swap(<span class="kw-2">&</span><span class="self">self</span>, val: <span class="prelude-ty">Option</span><Box<T>>) -> <span class="prelude-ty">Option</span><Box<T>> { |
| <span class="kw">let </span>old = <span class="self">self</span>.data.swap(to_raw(val), AcqRel); |
| from_raw(old) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set(<span class="kw-2">&</span><span class="self">self</span>, val: Box<T>) { |
| <span class="kw">let _ </span>= <span class="self">self</span>.swap(<span class="prelude-val">Some</span>(val)); |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>take(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><Box<T>> { |
| <span class="self">self</span>.swap(<span class="prelude-val">None</span>) |
| } |
| } |
| |
| <span class="kw">fn </span>to_raw<T>(data: <span class="prelude-ty">Option</span><Box<T>>) -> <span class="kw-2">*mut </span>T { |
| data.map(Box::into_raw).unwrap_or(ptr::null_mut()) |
| } |
| |
| <span class="kw">fn </span>from_raw<T>(val: <span class="kw-2">*mut </span>T) -> <span class="prelude-ty">Option</span><Box<T>> { |
| <span class="kw">if </span>val.is_null() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>(<span class="kw">unsafe </span>{ Box::from_raw(val) }) |
| } |
| } |
| |
| <span class="kw">impl</span><T> Drop <span class="kw">for </span>AtomicCell<T> { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="comment">// Free any data still held by the cell |
| </span><span class="kw">let _ </span>= <span class="self">self</span>.take(); |
| } |
| } |
| </code></pre></div> |
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