62 lines
5.3 KiB
HTML
62 lines
5.3 KiB
HTML
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<title>C++ 具名要求：可共享锁定 (SharedLockable)</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_named_req_SharedLockable skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">C++ 具名要求：</span><span style="font-style:italic">可共享锁定</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(SharedLockable)</span></h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-named_req.html">named req</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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<p><strong class="selflink"><span style="font-style:italic">可共享锁定</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(SharedLockable)</span></strong> 要求描述对执行代理（即线程）提供共享阻塞语义的类型的最小特征。</p>
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<h3><span class="mw-headline" id=".E8.A6.81.E6.B1.82">要求</span></h3>
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<p>对于要为<span style="font-style:italic">可共享锁定</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(SharedLockable)</span> 的类型 <code><b>L</b></code> ，必须对 <code><b>L</b></code> 类型的对象 <code><b>m</b></code> 满足下列条件：</p>
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<th>表达式</th>
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<th>前条件</th>
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<th>效果</th>
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<th>返回值</th>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">lock_shared</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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<td></td>
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<td>阻塞直至能对当前执行代理（线程、进程、任务）获得锁。若抛异常则不获得锁。</td>
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<td></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">try_lock_shared</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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<td></td>
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<td>尝试获得对当前执行代理（线程、进程、任务）获得锁。若抛异常则不获得锁。</td>
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<td>若获得锁则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，否则为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span></td>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">unlock_shared</span><span class="br0">(</span><span class="br0">)</span></span></span></td>
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<td>当前执行代理保有 <code>m</code> 上的共享锁。</td>
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<td>释放执行代理曾保有的共享锁。
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<p>不抛异常。</p>
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</td>
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<td></td>
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<h4><span class="mw-headline" id=".E5.85.B1.E4.BA.AB.E9.94.81">共享锁</span></h4>
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<p>若对象上的一个锁由调用 <code>lock_shared</code>、 <code>try_lock_shared</code>、 <code>try_lock_shared_for</code> 或 <code>try_lock_shared_until</code> 成员函数取得，则称之为<i>共享锁</i>。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<ul>
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<li><a href="cpp-thread.html">线程支持库</a></li>
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<li><a href="cpp-named_req-SharedTimedLockable.html"><span style="font-style:italic">可共享定时锁定</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(SharedTimedLockable)</span></a></li>
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<li><a href="cpp-named_req-SharedMutex.html"><span style="font-style:italic">共享互斥体</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(SharedMutex)</span></a></li>
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