48 lines
2.8 KiB
HTML
48 lines
2.8 KiB
HTML
<!DOCTYPE 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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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>std::experimental::latch::count_down_and_wait</title>
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<link rel="stylesheet" href="ext.css" />
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_latch_count_down_and_wait skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::latch::</span>count_down_and_wait</h1>
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<div id="bodyContent">
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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-latch.html">latch</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tr class="t-dcl t-since-concurrency">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> count_down_and_wait<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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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>原子地自减内部计数器 <code>1</code> ，（若需要则）并阻塞调用方线程直至计数器抵达零。</p>
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<p>若内部计数器已为零则行为未定义。</p>
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<p>此操作<a href="cpp-atomic-memory_order.html#.E5.85.88.E5.8F.91.E7.94.9F.E4.BA.8E">同步于</a>任何在此 <code>latch</code> 上阻塞的调用，和所有返回 <code>true</code> 的在此 <code>latch</code> 上的 <a href="cpp-experimental-latch-is_ready.html"><tt>is_ready</tt></a> 调用。</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>不抛出。</p>
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</div>
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<div class="visualClear"></div>
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</div>
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</body>
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