179 lines
8.2 KiB
HTML
179 lines
8.2 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="generator" content="rustdoc">
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<meta name="description" content="API documentation for the Rust `try_lock` crate.">
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<meta name="keywords" content="rust, rustlang, rust-lang, try_lock">
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<title>try_lock - Rust</title>
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<link rel="stylesheet" type="text/css" href="../normalize.css">
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<link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle">
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<link rel="stylesheet" type="text/css" href="../dark.css">
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<link rel="stylesheet" type="text/css" href="../main.css" id="themeStyle">
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<script src="../storage.js"></script>
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</head>
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<body class="rustdoc mod">
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<!--[if lte IE 8]>
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<div class="warning">
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This old browser is unsupported and will most likely display funky
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things.
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</div>
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<![endif]-->
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<nav class="sidebar">
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<div class="sidebar-menu">☰</div>
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<p class='location'>Crate try_lock</p><div class="sidebar-elems"><div class="block items"><ul><li><a href="#structs">Structs</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'try_lock', ty: 'mod', relpath: '../'};</script></div>
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</nav>
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<div class="theme-picker">
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<button id="theme-picker" aria-label="Pick another theme!">
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<img src="../brush.svg" width="18" alt="Pick another theme!">
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</button>
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<div id="theme-choices"></div>
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</div>
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<script src="../theme.js"></script>
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<nav class="sub">
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<form class="search-form js-only">
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<div class="search-container">
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<input class="search-input" name="search"
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autocomplete="off"
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placeholder="Click or press ‘S’ to search, ‘?’ for more options…"
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type="search">
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</div>
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</form>
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</nav>
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<section id='main' class="content">
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<h1 class='fqn'><span class='in-band'>Crate <a class="mod" href=''>try_lock</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../src/try_lock/lib.rs.html#1-161' title='goto source code'>[src]</a></span></h1>
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<div class='docblock'><p>A light-weight lock guarded by an atomic boolean.</p>
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<p>Most efficient when contention is low, acquiring the lock is a single
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atomic swap, and releasing it just 1 more atomic swap.</p>
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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Arc</span>;
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<span class="kw">use</span> <span class="ident">try_lock</span>::<span class="ident">TryLock</span>;
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<span class="comment">// a thing we want to share</span>
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<span class="kw">struct</span> <span class="ident">Widget</span> {
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<span class="ident">name</span>: <span class="ident">String</span>,
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}
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<span class="comment">// lock it up!</span>
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<span class="kw">let</span> <span class="ident">widget1</span> <span class="op">=</span> <span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">TryLock</span>::<span class="ident">new</span>(<span class="ident">Widget</span> {
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<span class="ident">name</span>: <span class="string">"Spanner"</span>.<span class="ident">into</span>(),
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}));
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<span class="kw">let</span> <span class="ident">widget2</span> <span class="op">=</span> <span class="ident">widget1</span>.<span class="ident">clone</span>();
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<span class="comment">// mutate the widget</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="ident">widget1</span>.<span class="ident">try_lock</span>().<span class="ident">expect</span>(<span class="string">"example isn't locked yet"</span>);
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<span class="ident">locked</span>.<span class="ident">name</span>.<span class="ident">push_str</span>(<span class="string">" Bundle"</span>);
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<span class="comment">// hands off, buddy</span>
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<span class="kw">let</span> <span class="ident">not_locked</span> <span class="op">=</span> <span class="ident">widget2</span>.<span class="ident">try_lock</span>();
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">not_locked</span>.<span class="ident">is_none</span>(), <span class="string">"widget1 has the lock"</span>);
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<span class="comment">// ok, you can have it</span>
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<span class="ident">drop</span>(<span class="ident">locked</span>);
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<span class="kw">let</span> <span class="ident">locked2</span> <span class="op">=</span> <span class="ident">widget2</span>.<span class="ident">try_lock</span>().<span class="ident">expect</span>(<span class="string">"widget1 lock is released"</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">locked2</span>.<span class="ident">name</span>, <span class="string">"Spanner Bundle"</span>);</pre>
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</div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.Locked.html"
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title='struct try_lock::Locked'>Locked</a></td>
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<td class='docblock-short'>
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<p>A locked value acquired from a <code>TryLock</code>.</p>
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</td>
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</tr>
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<tr class=' module-item'>
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<td><a class="struct" href="struct.TryLock.html"
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title='struct try_lock::TryLock'>TryLock</a></td>
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<td class='docblock-short'>
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<p>A light-weight lock guarded by an atomic boolean.</p>
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</td>
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</tr></table></section>
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<section id='search' class="content hidden"></section>
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<section class="footer"></section>
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<aside id="help" class="hidden">
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<div>
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<h1 class="hidden">Help</h1>
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<div class="shortcuts">
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<h2>Keyboard Shortcuts</h2>
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<dl>
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<dt><kbd>?</kbd></dt>
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<dd>Show this help dialog</dd>
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<dt><kbd>S</kbd></dt>
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<dd>Focus the search field</dd>
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<dt><kbd>↑</kbd></dt>
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<dd>Move up in search results</dd>
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<dt><kbd>↓</kbd></dt>
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<dd>Move down in search results</dd>
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<dt><kbd>↹</kbd></dt>
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<dd>Switch tab</dd>
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<dt><kbd>⏎</kbd></dt>
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<dd>Go to active search result</dd>
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<dt><kbd>+</kbd></dt>
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<dd>Expand all sections</dd>
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<dt><kbd>-</kbd></dt>
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<dd>Collapse all sections</dd>
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</dl>
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</div>
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<div class="infos">
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<h2>Search Tricks</h2>
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<p>
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Prefix searches with a type followed by a colon (e.g.
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<code>fn:</code>) to restrict the search to a given type.
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</p>
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<p>
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Accepted types are: <code>fn</code>, <code>mod</code>,
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<code>struct</code>, <code>enum</code>,
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<code>trait</code>, <code>type</code>, <code>macro</code>,
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and <code>const</code>.
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</p>
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<p>
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Search functions by type signature (e.g.
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<code>vec -> usize</code> or <code>* -> vec</code>)
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</p>
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</div>
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</div>
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</aside>
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<script>
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window.rootPath = "../";
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window.currentCrate = "try_lock";
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</script>
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<script src="../main.js"></script>
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<script defer src="../search-index.js"></script>
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</body>
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</html>
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