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153 lines
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<title>thread_local - Rust</title>
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<p class='location'></p><script>window.sidebarCurrent = {name: 'thread_local', ty: 'mod', relpath: '../'};</script>
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<section id='main' class="content mod">
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<h1 class='fqn'><span class='in-band'>Crate <a class='mod' href=''>thread_local</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 id='src-0' class='srclink' href='../src/thread_local/lib.rs.html#8-438' title='goto source code'>[src]</a></span></h1>
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<div class='docblock'><p>Per-object thread-local storage</p>
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<p>This library provides the <code>ThreadLocal</code> type which allows a separate copy of
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an object to be used for each thread. This allows for per-object
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thread-local storage, unlike the standard library's <code>thread_local!</code> macro
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which only allows static thread-local storage.</p>
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<p>Per-thread objects are not destroyed when a thread exits. Instead, objects
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are only destroyed when the <code>ThreadLocal</code> containing them is destroyed.</p>
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<p>A <code>CachedThreadLocal</code> type is also provided which wraps a <code>ThreadLocal</code> but
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also uses a special fast path for the first thread that writes into it. The
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fast path has very low overhead (<1ns per access) while keeping the same
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performance as <code>ThreadLocal</code> for other threads.</p>
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<p>Note that since thread IDs are recycled when a thread exits, it is possible
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for one thread to retrieve the object of another thread. Since this can only
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occur after a thread has exited this does not lead to any race conditions.</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'>thread_local</span>::<span class='ident'>ThreadLocal</span>;
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<span class='kw'>let</span> <span class='ident'>tls</span>: <span class='ident'>ThreadLocal</span><span class='op'><</span><span class='ident'>u32</span><span class='op'>></span> <span class='op'>=</span> <span class='ident'>ThreadLocal</span>::<span class='ident'>new</span>();
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<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>tls</span>.<span class='ident'>get</span>(), <span class='prelude-val'>None</span>);
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<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>tls</span>.<span class='ident'>get_or</span>(<span class='op'>||</span> <span class='ident'>Box</span>::<span class='ident'>new</span>(<span class='number'>5</span>)), <span class='kw-2'>&</span><span class='number'>5</span>);
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<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>tls</span>.<span class='ident'>get</span>(), <span class='prelude-val'>Some</span>(<span class='kw-2'>&</span><span class='number'>5</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.CachedThreadLocal.html'
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title='thread_local::CachedThreadLocal'>CachedThreadLocal</a></td>
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<td class='docblock short'>
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<p>Wrapper around <code>ThreadLocal</code> which adds a fast path for a single thread.</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.ThreadLocal.html'
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title='thread_local::ThreadLocal'>ThreadLocal</a></td>
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<td class='docblock short'>
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<p>Thread-local variable wrapper</p>
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</td>
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</tr></table></section>
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