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<h1 class='fqn'><span class='in-band'>Struct <a href='../../index.html'>bitflags</a>::<wbr><a href='../index.html'>__core</a>::<wbr><a href='index.html'>sync</a>::<wbr><a class='struct' href=''>Barrier</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a id='src-10011' class='srclink' href='https://doc.rust-lang.org/nightly/std/sync/barrier/struct.Barrier.html?gotosrc=10011' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct Barrier {
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// some fields omitted
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}</pre><span class="since">1.0.0</span><div class='docblock'><p>A barrier enables multiple threads to synchronize the beginning
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of some computation.</p>
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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>, <span class='ident'>Barrier</span>};
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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='kw-2'>mut</span> <span class='ident'>handles</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='number'>10</span>);
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<span class='kw'>let</span> <span class='ident'>barrier</span> <span class='op'>=</span> <span class='ident'>Arc</span>::<span class='ident'>new</span>(<span class='ident'>Barrier</span>::<span class='ident'>new</span>(<span class='number'>10</span>));
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<span class='kw'>for</span> _ <span class='kw'>in</span> <span class='number'>0</span>..<span class='number'>10</span> {
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<span class='kw'>let</span> <span class='ident'>c</span> <span class='op'>=</span> <span class='ident'>barrier</span>.<span class='ident'>clone</span>();
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<span class='comment'>// The same messages will be printed together.</span>
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<span class='comment'>// You will NOT see any interleaving.</span>
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<span class='ident'>handles</span>.<span class='ident'>push</span>(<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='macro'>println</span><span class='macro'>!</span>(<span class='string'>"before wait"</span>);
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<span class='ident'>c</span>.<span class='ident'>wait</span>();
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<span class='macro'>println</span><span class='macro'>!</span>(<span class='string'>"after wait"</span>);
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}));
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}
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<span class='comment'>// Wait for other threads to finish.</span>
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<span class='kw'>for</span> <span class='ident'>handle</span> <span class='kw'>in</span> <span class='ident'>handles</span> {
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<span class='ident'>handle</span>.<span class='ident'>join</span>().<span class='ident'>unwrap</span>();
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}</pre>
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