61 lines
5.2 KiB
HTML
61 lines
5.2 KiB
HTML
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<title>std::experimental::flex_barrier::arrive_and_wait</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_flex_barrier_arrive_and_wait skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::flex_barrier::</span>arrive_and_wait</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a>‎ | <a href="cpp-experimental-flex_barrier.html">flex barrier</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> arrive_and_wait<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-concurrency-ts t-mark-ts">(并发 TS)</span></td>
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<p>阻塞并到达 <code>flex_barrier</code> 的同步点。</p>
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<p>若调用线程不在此 <code>flex_barrier</code> 的参与线程集中，则行为未定义。</p>
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<p>对 <code>arrive_and_wait</code> 的调用同步于 <code>flex_barrier</code> 完成阶段的开始。完成阶段的完成同步于从调用返回。</p>
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<p>调用 <code>arrive_and_drop</code> 和 <code>arrive_and_wait</code> 决不引入与自身或彼此的数据竞争。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>从此调用返回时，线程立即调用 <code>arrive_and_wait()</code> 或 <code>arrive_and_drop()</code> 是安全的（只要完成阶段的函数对象不返回零）。不需要确保所有阻塞线程都在一个线程再次调用它时已退出 <code>arrive_and_wait()</code> 。</p>
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<p>完成阶段执行构造 <code>flex_barrier</code> 时指定的函数对象。若它返回 -1 ，则不更改参与线程集（而下个循环中同一参与线程集必须抵达同步点）；否则参与线程集变为拥有等于返回值 <code>N</code> 的新大小的集合，并由到达屏障同步点的下 <code>N</code> 个线程组成。若 <span class="t-c"><span class="mw-geshi cpp source-cpp">N <span class="sy1">==</span> <span class="nu0">0</span></span></span> ，则 <code>flex_barrier</code> 只能被销毁。</p>
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<p>为 <code>num_threads</code> 个线程构造的 <code>flex_barrier</code> 的的初始参与线程集是首 <code>num_threads</code> 个到达其同步点的线程。</p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>不抛出。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-experimental-flex_barrier-arrive_and_drop.html"><span class="t-lines"><span>arrive_and_drop</span></span></a></div>
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<td>到达同步点并从参与线程集中移除当前线程<br />
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<span class="t-mark">(公开成员函数)</span></td>
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