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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="Additional methods for mutexes which support fair unlocking."><title>RawMutexFair in lock_api - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-b0742ba02757f159.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="lock_api" data-themes="" data-resource-suffix="" data-rustdoc-version="1.83.0 (90b35a623 2024-11-26)" data-channel="1.83.0" data-search-js="search-f0d225181b97f9a4.js" data-settings-js="settings-805db61a62df4bd2.js" ><script src="../static.files/storage-1d39b6787ed640ff.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-f070b9041d14864c.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-0111fcff984fae8f.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc trait"><!--[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" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../lock_api/index.html">lock_<wbr>api</a><span class="version">0.4.12</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">RawMutex<wbr>Fair</a></h2><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.unlock_fair" title="unlock_fair">unlock_fair</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.bump" title="bump">bump</a></li></ul><h3><a href="#object-safety">Object Safety</a></h3><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate lock_<wbr>api</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="index.html">lock_api</a></span><h1>Trait <span class="trait">RawMutexFair</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/lock_api/mutex.rs.html#87-110">source</a> </span></div><pre class="rust item-decl"><code>pub unsafe trait RawMutexFair: <a class="trait" href="trait.RawMutex.html" title="trait lock_api::RawMutex">RawMutex</a> {
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// Required method
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unsafe fn <a href="#tymethod.unlock_fair" class="fn">unlock_fair</a>(&self);
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// Provided method
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unsafe fn <a href="#method.bump" class="fn">bump</a>(&self) { ... }
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Additional methods for mutexes which support fair unlocking.</p>
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<p>Fair unlocking means that a lock is handed directly over to the next waiting
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thread if there is one, without giving other threads the opportunity to
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“steal” the lock in the meantime. This is typically slower than unfair
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unlocking, but may be necessary in certain circumstances.</p>
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</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.unlock_fair" class="method"><a class="src rightside" href="../src/lock_api/mutex.rs.html#94">source</a><h4 class="code-header">unsafe fn <a href="#tymethod.unlock_fair" class="fn">unlock_fair</a>(&self)</h4></section></summary><div class="docblock"><p>Unlocks this mutex using a fair unlock protocol.</p>
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<h5 id="safety"><a class="doc-anchor" href="#safety">§</a>Safety</h5>
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<p>This method may only be called if the mutex is held in the current context, see
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the documentation of <a href="trait.RawMutex.html#tymethod.unlock" title="method lock_api::RawMutex::unlock"><code>unlock</code></a>.</p>
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</div></details></div><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="method.bump" class="method"><a class="src rightside" href="../src/lock_api/mutex.rs.html#106-109">source</a><h4 class="code-header">unsafe fn <a href="#method.bump" class="fn">bump</a>(&self)</h4></section></summary><div class="docblock"><p>Temporarily yields the mutex to a waiting thread if there is one.</p>
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<p>This method is functionally equivalent to calling <code>unlock_fair</code> followed
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by <code>lock</code>, however it can be much more efficient in the case where there
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are no waiting threads.</p>
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<h5 id="safety-1"><a class="doc-anchor" href="#safety-1">§</a>Safety</h5>
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<p>This method may only be called if the mutex is held in the current context, see
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the documentation of <a href="trait.RawMutex.html#tymethod.unlock" title="method lock_api::RawMutex::unlock"><code>unlock</code></a>.</p>
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</div></details></div><h2 id="object-safety" class="section-header">Object Safety<a href="#object-safety" class="anchor">§</a></h2><div class="object-safety-info">This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.83.0/reference/items/traits.html#object-safety">object safe</a>.</div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../trait.impl/lock_api/mutex/trait.RawMutexFair.js" async></script></section></div></main></body></html>
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