59 lines
5.5 KiB
HTML
59 lines
5.5 KiB
HTML
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<title>C++ 具名要求：可共享定时锁定 (SharedTimedLockable)</title>
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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">可共享定时锁定</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(SharedTimedLockable)</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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<p><strong class="selflink"><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></strong> 要求描述为执行代理（线程、进程、任务）提供定时排他性阻塞语义的类型特征。</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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<ul>
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<li><a href="cpp-named_req-SharedLockable.html"><span style="font-style:italic">可共享锁定</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(SharedLockable)</span></a></li>
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<p>对于要为<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> 的类型 <code><b>L</b></code> ，给定</p>
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<ul>
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<li><code>rel_time</code> ， <span class="t-lc"><a href="cpp-chrono-duration.html">std::chrono::duration</a></span> 的特化的值，及</li>
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<li><code>abs_time</code> ， <span class="t-lc"><a href="cpp-chrono-time_point.html">std::chrono::time_point</a></span> 的特化的值，</li>
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</ul>
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<p>对 <code><b>L</b></code> 类型对象 <code><b>m</b></code> 必须满足下列条件：</p>
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<table class="wikitable">
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<th>表达式</th>
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<th>要求</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">try_lock_shared_for</span><span class="br0">(</span>rel_time<span class="br0">)</span></span></span></td>
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<td>阻塞提供的时长 <code>rel_time</code> ，或直至取得 <code><b>m</b></code> 上的锁。</td>
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<td>若取得锁则为 <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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</tr>
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<td><span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">try_lock_shared_until</span><span class="br0">(</span>abs_time<span class="br0">)</span></span></span></td>
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<td>阻塞直至提供的时间点 <code>abs_time</code> ，或直至取得 <code><b>m</b></code> 上的锁。</td>
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<td>若取得锁则为 <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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<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">注解</span></h3>
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<p><code>try_lock_shared_for</code> 与 <code>try_lock_shared_until</code> 成员函数在成功时在 <code>m</code> 上获得共享锁。</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-SharedTimedMutex.html"><span style="font-style:italic">共享定时互斥体</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(SharedTimedMutex)</span></a></li>
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<li><a href="cpp-named_req-SharedLockable.html"><span style="font-style:italic">可共享锁定</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(SharedLockable)</span></a></li>
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