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<p class='location'>Struct WaitGroup</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a><a href="#method.add">add</a><a href="#method.done">done</a><a href="#method.wait">wait</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Clone">Clone</a><a href="#impl-Debug">Debug</a></div><a class="sidebar-title" href="#synthetic-implementations">Auto Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">Send</a><a href="#impl-Sync">Sync</a></div></div><p class='location'><a href='index.html'>chan</a></p><script>window.sidebarCurrent = {name: 'WaitGroup', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content"><h1 class='fqn'><span class='in-band'>Struct <a href='index.html'>chan</a>::<wbr><a class="struct" href=''>WaitGroup</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/chan/wait_group.rs.html#32' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct WaitGroup(_);</pre></div><div class='docblock'><p><code>WaitGroup</code> provides synchronization on the completion of threads.</p>
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<p>For each thread involved in the synchronization, <code>add(1)</code> should be
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called. Just before a thread terminates, it should call <code>done</code>.
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To synchronize, call <code>wait</code>, which will block until the number of <code>done</code>
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calls corresponds to the number of <code>add(1)</code> calls.</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">thread</span>;
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<span class="kw">let</span> <span class="ident">wg</span> <span class="op">=</span> <span class="ident">chan</span>::<span class="ident">WaitGroup</span>::<span class="ident">new</span>();
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<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">4</span> {
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<span class="ident">wg</span>.<span class="ident">add</span>(<span class="number">1</span>);
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<span class="kw">let</span> <span class="ident">wg</span> <span class="op">=</span> <span class="ident">wg</span>.<span class="ident">clone</span>();
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<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="kw">move</span> <span class="op">||</span> {
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<span class="comment">// do some work.</span>
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<span class="comment">// And now call done.</span>
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<span class="ident">wg</span>.<span class="ident">done</span>();
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});
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}
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<span class="comment">// Blocks until `wg.done()` is called for each thread we spawned.</span>
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<span class="ident">wg</span>.<span class="ident">wait</span>()</pre>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="struct" href="../chan/struct.WaitGroup.html" title="struct chan::WaitGroup">WaitGroup</a></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/chan/wait_group.rs.html#39-77' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.new' class='fnname'>new</a>() -> <a class="struct" href="../chan/struct.WaitGroup.html" title="struct chan::WaitGroup">WaitGroup</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/chan/wait_group.rs.html#41-46' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Create a new wait group.</p>
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</div><h4 id='method.add' class="method"><span id='add.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.add' class='fnname'>add</a>(&self, delta: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a>)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/chan/wait_group.rs.html#54-59' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Add a new thread to the waitgroup.</p>
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<h1 id="failure" class="section-header"><a href="#failure">Failure</a></h1>
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<p>If the internal count drops below <code>0</code> as a result of calling <code>add</code>,
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then this function panics.</p>
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</div><h4 id='method.done' class="method"><span id='done.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.done' class='fnname'>done</a>(&self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/chan/wait_group.rs.html#64-66' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Mark a thread as having finished.</p>
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<p>(This is equivalent to calling <code>add(-1)</code>.)</p>
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</div><h4 id='method.wait' class="method"><span id='wait.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.wait' class='fnname'>wait</a>(&self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/chan/wait_group.rs.html#71-76' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Wait until all threads have completed.</p>
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<p>This unblocks when the internal count is <code>0</code>.</p>
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<h3 id='impl-Clone' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../chan/struct.WaitGroup.html" title="struct chan::WaitGroup">WaitGroup</a></code><a href='#impl-Clone' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/chan/wait_group.rs.html#31' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class="struct" href="../chan/struct.WaitGroup.html" title="struct chan::WaitGroup">WaitGroup</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/chan/wait_group.rs.html#31' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
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</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/clone.rs.html#117-119' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
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</div></div><h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../chan/struct.WaitGroup.html" title="struct chan::WaitGroup">WaitGroup</a></code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/chan/wait_group.rs.html#79-84' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../src/chan/wait_group.rs.html#80-83' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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