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<meta name="description" content="API documentation for the Rust `try_lock` crate.">
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<title>try_lock - Rust</title>
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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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<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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</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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