52 lines
3.4 KiB
HTML
52 lines
3.4 KiB
HTML
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<title>std::counting_semaphore<LeastMaxValue>::release</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_counting_semaphore_release 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::counting_semaphore<LeastMaxValue>::</span>release</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-counting_semaphore.html">counting semaphore</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> release<span class="br0">(</span> <a href="cpp-types-ptrdiff_t.html"><span class="kw101">std::<span class="me2">ptrdiff_t</span></span></a> update <span class="sy1">=</span> <span class="nu0">1</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>原子地将内部计数器的值增加 <code>update</code> 。任何等待计数器大于 <span class="t-c"><span class="mw-geshi cpp source-cpp">​<span class="nu0">0</span>​</span></span> 的线程，如由于阻塞于 <span class="t-c"><span class="mw-geshi cpp source-cpp">acquire</span></span> 者，将继而被除阻。</p>
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<h3><span class="mw-headline" id=".E5.89.8D.E6.9D.A1.E4.BB.B6">前条件</span></h3>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp">update <span class="sy1">>=</span> <span class="nu0">0</span></span></span> 与 <span class="t-c"><span class="mw-geshi cpp source-cpp">update <span class="sy1"><=</span> max<span class="br0">(</span><span class="br0">)</span> <span class="sy2">-</span> counter</span></span> 均为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，其中 <code>counter</code> 是内部计数器的值。</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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<table class="t-par-begin">
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<td>update</td>
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<td>-</td>
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<td>要更新计数器的数量</td>
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</tr>
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</table>
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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>可能抛出 <span class="t-lc"><a href="cpp-error-system_error.html">std::system_error</a></span> 。</p>
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