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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 RwLocks which support fair unlocking."><title>RawRwLockFair in lock_api - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-ac92e1bbe349e143.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="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><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">☰</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../lock_api/index.html">lock_api</a><span class="version">0.4.11</span></h2></div><h2 class="location"><a href="#">RawRwLockFair</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.unlock_exclusive_fair">unlock_exclusive_fair</a></li><li><a href="#tymethod.unlock_shared_fair">unlock_shared_fair</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.bump_exclusive">bump_exclusive</a></li><li><a href="#method.bump_shared">bump_shared</a></li></ul><h3><a href="#object-safety">Object Safety</a></h3><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In crate lock_api</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../lock_api/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Trait <a href="index.html">lock_api</a>::<wbr><a class="trait" href="#">RawRwLockFair</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/lock_api/rwlock.rs.html#107-149">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub unsafe trait RawRwLockFair: <a class="trait" href="trait.RawRwLock.html" title="trait lock_api::RawRwLock">RawRwLock</a> {
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// Required methods
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unsafe fn <a href="#tymethod.unlock_shared_fair" class="fn">unlock_shared_fair</a>(&self);
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<span class="item-spacer"></span> unsafe fn <a href="#tymethod.unlock_exclusive_fair" class="fn">unlock_exclusive_fair</a>(&self);
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// Provided methods
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unsafe fn <a href="#method.bump_shared" class="fn">bump_shared</a>(&self) { ... }
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<span class="item-spacer"></span> unsafe fn <a href="#method.bump_exclusive" class="fn">bump_exclusive</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 RwLocks 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_shared_fair" class="method"><a class="src rightside" href="../src/lock_api/rwlock.rs.html#113">source</a><h4 class="code-header">unsafe fn <a href="#tymethod.unlock_shared_fair" class="fn">unlock_shared_fair</a>(&self)</h4></section></summary><div class="docblock"><p>Releases a shared lock using a fair unlock protocol.</p>
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<h5 id="safety"><a href="#safety">Safety</a></h5>
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<p>This method may only be called if a shared lock is held in the current context.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.unlock_exclusive_fair" class="method"><a class="src rightside" href="../src/lock_api/rwlock.rs.html#120">source</a><h4 class="code-header">unsafe fn <a href="#tymethod.unlock_exclusive_fair" class="fn">unlock_exclusive_fair</a>(&self)</h4></section></summary><div class="docblock"><p>Releases an exclusive lock using a fair unlock protocol.</p>
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<h5 id="safety-1"><a href="#safety-1">Safety</a></h5>
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<p>This method may only be called if an exclusive lock is held in the current context.</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_shared" class="method"><a class="src rightside" href="../src/lock_api/rwlock.rs.html#131-134">source</a><h4 class="code-header">unsafe fn <a href="#method.bump_shared" class="fn">bump_shared</a>(&self)</h4></section></summary><div class="docblock"><p>Temporarily yields a shared lock to a waiting thread if there is one.</p>
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<p>This method is functionally equivalent to calling <code>unlock_shared_fair</code> followed
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by <code>lock_shared</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-2"><a href="#safety-2">Safety</a></h5>
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<p>This method may only be called if a shared lock is held in the current context.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.bump_exclusive" class="method"><a class="src rightside" href="../src/lock_api/rwlock.rs.html#145-148">source</a><h4 class="code-header">unsafe fn <a href="#method.bump_exclusive" class="fn">bump_exclusive</a>(&self)</h4></section></summary><div class="docblock"><p>Temporarily yields an exclusive lock to a waiting thread if there is one.</p>
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<p>This method is functionally equivalent to calling <code>unlock_exclusive_fair</code> followed
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by <code>lock_exclusive</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-3"><a href="#safety-3">Safety</a></h5>
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<p>This method may only be called if an exclusive lock is held in the current context.</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/1.76.0/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/rwlock/trait.RawRwLockFair.js" async></script></section></div></main></body></html> |