74 lines
4.5 KiB
HTML
74 lines
4.5 KiB
HTML
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<title>std::lock_guard<Mutex>::lock_guard</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_lock_guard_lock_guard 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::lock_guard<Mutex>::</span>lock_guard</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-lock_guard.html">lock guard</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> lock_guard<span class="br0">(</span> mutex_type<span class="sy3">&</span> m <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-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">lock_guard<span class="br0">(</span> mutex_type<span class="sy3">&</span> m, <a href="cpp-thread-lock_tag_t.html"><span class="kw2162">std::<span class="me2">adopt_lock_t</span></span></a> t <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp">lock_guard<span class="br0">(</span> <span class="kw4">const</span> lock_guard<span class="sy3">&</span> <span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span></span></div>
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<td>(3)</td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<td></td>
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<td></td>
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<td></td>
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<p>获得给定互斥 <code>m</code> 的所有权。</p>
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<div class="t-li1"><span class="t-li">1)</span> 等效地调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">lock</span><span class="br0">(</span><span class="br0">)</span></span></span> 。</div>
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<div class="t-li1"><span class="t-li">2)</span> 获得互斥 <span class="t-c"><span class="mw-geshi cpp source-cpp">m</span></span> 的所有权而不试图锁定它。若当前线程不在 <code>m</code> 上保有非共享锁（即由 <code>lock</code>、 <code>try_lock</code>、 <code>try_lock_for</code> 或 <code>try_lock_until</code> 取得的锁）则行为未定义。</div>
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<div class="t-li1"><span class="t-li">3)</span> 复制构造函数被删除。</div>
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<p>若在 <code>m</code> 先于 <code>lock_guard</code> 对象被销毁，则行为未定义。</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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<td>m</td>
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<td>-</td>
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<td>要获得所有权的共享互斥</td>
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</tr>
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<tr class="t-par">
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<td>t</td>
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<td>-</td>
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<td>用于选择构造函数非锁定版本的标签参数</td>
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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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<div class="t-li1"><span class="t-li">1)</span> 抛任何 <span class="t-c"><span class="mw-geshi cpp source-cpp">m.<span class="me1">lock</span><span class="br0">(</span><span class="br0">)</span></span></span> 所抛的异常</div>
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<div class="t-li1"><span class="t-li">2)</span> 不抛出</div>
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