59 lines
3.9 KiB
HTML
59 lines
3.9 KiB
HTML
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<title>std::barrier<CompletionFunction>::arrive_and_drop</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_barrier_arrive_and_drop 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::barrier<CompletionFunction>::</span>arrive_and_drop</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-thread.html">thread</a>‎ | <a href="cpp-thread-barrier.html">barrier</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> arrive_and_drop<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-cxx20">(C++20 起)</span></td>
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<p>将所有后继阶段的初始期待计数减少一，然后将当前阶段的期待计数减少一。</p>
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<p>此函数原子地执行。对此函数的调用<a href="cpp-atomic-memory_order.html#.E5.BC.BA.E5.85.88.E5.8F.91.E7.94.9F.E4.BA.8E">强先发生于</a>当前阶段的阶段完成步骤的开始。</p>
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<p>若当前阶段的期待计数为零则行为未定义。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<p>（无）</p>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>（无）</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>错误时抛出 <span class="t-lc"><a href="cpp-error-system_error.html">std::system_error</a></span> ，带有对互斥体类型允许的错误码。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
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<p>此函数能导致当前阶段的阶段完成步骤开始。</p>
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<p>若调用此函数前当前期待计数为零，则所有后继阶段的初始期待计数亦为零，这表示无法重用该 <code>barrier</code> 。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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