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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="Source of the Rust file `src/sync/mutex.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mutex.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" type="text/css" href="../../../normalize.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../../dark.css" disabled><link rel="stylesheet" type="text/css" 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="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../../os/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../../os/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../../../os/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><nav class="sub"><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"><button type="button">?</button></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></div><section id="main-content" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1">1</span>
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident"><span class="kw">super</span>::UPIntrFreeCell</span>;
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<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::task::TaskControlBlock</span>;
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<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::task</span>::{<span class="ident">add_task</span>, <span class="ident">current_task</span>};
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<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::task</span>::{<span class="ident">block_current_and_run_next</span>, <span class="ident">suspend_current_and_run_next</span>};
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<span class="kw">use</span> <span class="ident">alloc</span>::{<span class="ident">collections::VecDeque</span>, <span class="ident">sync::Arc</span>};
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<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Mutex</span>: <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Send</span> {
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<span class="kw">fn</span> <span class="ident">lock</span>(<span class="kw-2">&</span><span class="self">self</span>);
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<span class="kw">fn</span> <span class="ident">unlock</span>(<span class="kw-2">&</span><span class="self">self</span>);
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}
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<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">MutexSpin</span> {
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<span class="ident">locked</span>: <span class="ident">UPIntrFreeCell</span><span class="op"><</span><span class="ident">bool</span><span class="op">></span>,
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}
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<span class="kw">impl</span> <span class="ident">MutexSpin</span> {
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() -> <span class="self">Self</span> {
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<span class="self">Self</span> {
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<span class="ident">locked</span>: <span class="kw">unsafe</span> { <span class="ident">UPIntrFreeCell::new</span>(<span class="bool-val">false</span>) },
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}
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}
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}
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<span class="kw">impl</span> <span class="ident">Mutex</span> <span class="kw">for</span> <span class="ident">MutexSpin</span> {
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<span class="kw">fn</span> <span class="ident">lock</span>(<span class="kw-2">&</span><span class="self">self</span>) {
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<span class="kw">loop</span> {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">locked</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">locked</span>.<span class="ident">exclusive_access</span>();
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<span class="kw">if</span> <span class="kw-2">*</span><span class="ident">locked</span> {
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<span class="ident">drop</span>(<span class="ident">locked</span>);
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<span class="ident">suspend_current_and_run_next</span>();
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<span class="kw">continue</span>;
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} <span class="kw">else</span> {
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<span class="kw-2">*</span><span class="ident">locked</span> <span class="op">=</span> <span class="bool-val">true</span>;
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<span class="kw">return</span>;
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}
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}
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}
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<span class="kw">fn</span> <span class="ident">unlock</span>(<span class="kw-2">&</span><span class="self">self</span>) {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">locked</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">locked</span>.<span class="ident">exclusive_access</span>();
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<span class="kw-2">*</span><span class="ident">locked</span> <span class="op">=</span> <span class="bool-val">false</span>;
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}
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}
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<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">MutexBlocking</span> {
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<span class="ident">inner</span>: <span class="ident">UPIntrFreeCell</span><span class="op"><</span><span class="ident">MutexBlockingInner</span><span class="op">></span>,
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}
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<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">MutexBlockingInner</span> {
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<span class="ident">locked</span>: <span class="ident">bool</span>,
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<span class="ident">wait_queue</span>: <span class="ident">VecDeque</span><span class="op"><</span><span class="ident">Arc</span><span class="op"><</span><span class="ident">TaskControlBlock</span><span class="op">></span><span class="op">></span>,
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}
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<span class="kw">impl</span> <span class="ident">MutexBlocking</span> {
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() -> <span class="self">Self</span> {
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<span class="self">Self</span> {
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<span class="ident">inner</span>: <span class="kw">unsafe</span> {
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<span class="ident">UPIntrFreeCell::new</span>(<span class="ident">MutexBlockingInner</span> {
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<span class="ident">locked</span>: <span class="bool-val">false</span>,
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<span class="ident">wait_queue</span>: <span class="ident">VecDeque::new</span>(),
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})
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},
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}
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}
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}
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<span class="kw">impl</span> <span class="ident">Mutex</span> <span class="kw">for</span> <span class="ident">MutexBlocking</span> {
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<span class="kw">fn</span> <span class="ident">lock</span>(<span class="kw-2">&</span><span class="self">self</span>) {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">mutex_inner</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">exclusive_access</span>();
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<span class="kw">if</span> <span class="ident">mutex_inner</span>.<span class="ident">locked</span> {
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<span class="ident">mutex_inner</span>.<span class="ident">wait_queue</span>.<span class="ident">push_back</span>(<span class="ident">current_task</span>().<span class="ident">unwrap</span>());
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<span class="ident">drop</span>(<span class="ident">mutex_inner</span>);
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<span class="ident">block_current_and_run_next</span>();
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} <span class="kw">else</span> {
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<span class="ident">mutex_inner</span>.<span class="ident">locked</span> <span class="op">=</span> <span class="bool-val">true</span>;
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}
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}
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<span class="kw">fn</span> <span class="ident">unlock</span>(<span class="kw-2">&</span><span class="self">self</span>) {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">mutex_inner</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">exclusive_access</span>();
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<span class="macro">assert!</span>(<span class="ident">mutex_inner</span>.<span class="ident">locked</span>);
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<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">waking_task</span>) <span class="op">=</span> <span class="ident">mutex_inner</span>.<span class="ident">wait_queue</span>.<span class="ident">pop_front</span>() {
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<span class="ident">add_task</span>(<span class="ident">waking_task</span>);
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} <span class="kw">else</span> {
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<span class="ident">mutex_inner</span>.<span class="ident">locked</span> <span class="op">=</span> <span class="bool-val">false</span>;
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}
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}
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}
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</code></pre></div>
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