99 lines
6.3 KiB
HTML
99 lines
6.3 KiB
HTML
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<title>std::experimental::flex_barrier</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_flex_barrier 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::</span>flex_barrier</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a></span></div>
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<div>定义于头文件 <code><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/header/experimental/barrier&action=edit&redlink=1" class="new" title="cpp/header/experimental/barrier（页面不存在）"><experimental/barrier></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">class</span> flex_barrier<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>类 <code>std::experimental::flex_barrier</code> 提供线程协调机制，允许参与线程的集合阻塞直至操作完成。不同于 <span class="t-lc">std::experimental::latch</span> ，屏障可重用；一旦从屏障的同步点释放参与线程，则它们能重用同一屏障。</p>
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<p>屏障拥有完成阶段，一旦参与线程集中的所有线程都到达同步点，则由参与线程之一执行完成阶段。 <code>arrive_and_wait</code> 和 <code>arrive_and_drop</code> 的调用<a href="cpp-atomic-memory_order.html">同步于</a>完成阶段的开始；完成阶段的结束同步于从其完成所阻塞的所有调用返回。</p>
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<p><code>std::experimental::flex_barrier</code> 允许用户以函数对象控制完成阶段。若函数对象返回 -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。</p>
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<p>不需要此功能的用户能使用 <span class="t-lc">std::experimental::barrier</span> 。</p>
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<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-experimental-flex_barrier-flex_barrier.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</td>
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<td>构造 <code>flex_barrier</code><br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div class="t-dsc-member-div t-dsc-member-nobold-div">
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<div><a href="cpp-experimental-flex_barrier-~flex_barrier.html"><span class="t-lines"><span>(析构函数)</span></span></a></div>
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<td>销毁 <code>flex_barrier</code><br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><span class="t-lines"><span>operator=</span></span></div>
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<div><span class="t-lines"><span><span class="t-cmark">[被删除]</span></span></span></div>
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<td>非可复制赋值<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div><a href="cpp-experimental-flex_barrier-arrive_and_wait.html"><span class="t-lines"><span>arrive_and_wait</span></span></a></div>
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<td>到达同步点并阻塞<br />
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<span class="t-mark">(公开成员函数)</span></td>
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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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