116 lines
5.5 KiB
HTML
116 lines
5.5 KiB
HTML
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<title>std::experimental::latch</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_latch 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>latch</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/latch&action=edit&redlink=1" class="new" title="cpp/header/experimental/latch（页面不存在）"><experimental/latch></a></code></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">class</span> latch<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><code>latch</code> 是 <code>ptrdiff_t</code> 类型的向下计数器，它能用于同步线程。在创建时初始化计数器的值。</p>
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<p>线程可能在 <code>latch</code> 上阻塞直至计数器减少到零。没有可能增加或重置计数器，这使 <code>latch</code> 为单次使用的屏障。</p>
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<p>不同于 <a href="cpp-experimental-barrier.html"><tt>std::experimental::barrier</tt></a> ，参与线程能减少 <code>std::experimental::latch</code> 多于一次。</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-latch-latch.html"><span class="t-lines"><span>(构造函数)</span></span></a></div>
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</div>
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</td>
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<td>构造 <code>latch</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-latch-~latch.html"><span class="t-lines"><span>(析构函数)</span></span></a></div>
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</td>
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<td>销毁 <code>latch</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>
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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-latch-count_down_and_wait.html"><span class="t-lines"><span>count_down_and_wait</span></span></a></div>
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</td>
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<td>减少计数器 <code>1</code> 并阻塞直至它抵达零<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-latch-count_down.html"><span class="t-lines"><span>count_down</span></span></a></div>
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</td>
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<td>以非阻塞方式自减计数器<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-latch-is_ready.html"><span class="t-lines"><span>is_ready</span></span></a></div>
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</div>
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</td>
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<td>测试内部计数器是否等于零<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<tr class="t-dsc">
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<div><a href="cpp-experimental-latch-wait.html"><span class="t-lines"><span>wait</span></span></a></div>
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</td>
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<td>阻塞直至计数器抵达零<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</table>
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<div class="visualClear"></div>
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