120 lines
8.9 KiB
HTML
120 lines
8.9 KiB
HTML
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<title>std::shared_lock<Mutex>::try_lock_until</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_thread_shared_lock_try_lock_until 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::shared_lock<Mutex>::</span>try_lock_until</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-shared_lock.html">shared lock</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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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1"><</span> <span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration <span class="sy1">></span><br />
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<span class="kw4">bool</span> try_lock_until<span class="br0">(</span> <span class="kw4">const</span> <a href="cpp-chrono-time_point.html"><span class="kw991">std::<span class="me2">chrono</span><span class="sy4">::</span><span class="me2">time_point</span></span></a><span class="sy1"><</span>Clock,Duration<span class="sy1">></span><span class="sy3">&</span> timeout_time <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx14">(C++14 起)</span></td>
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<td></td>
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<td></td>
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<p>试图以共享模式锁定关联互斥。阻塞直至抵达给定的 <code>timeout_time</code> 或得到互斥，之先到来者。成功获得互斥时返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">true</span></span></span> ，否则返回 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 。可能阻塞长于直至抵达 <code>timeout_time</code> 。</p>
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<p>等效地调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">mutex<span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">></span>try_lock_shared_until<span class="br0">(</span>timeout_time<span class="br0">)</span></span></span> 。</p>
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<p>若无关联互斥或已锁定互斥则返回 <span class="t-lc"><a href="cpp-error-system_error.html">std::system_error</a></span> 。</p>
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<p><code>Clock</code> 必须符合<a href="cpp-named_req-Clock.html"><span style="font-style:italic">时钟</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(Clock)</span></a> 要求。若 <code>Mutex</code> 不符合<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> 要求则行为未定义。<span class="t-rev-inl t-since-cxx20"><span>若 <span class="t-c"><span class="mw-geshi cpp source-cpp">std<span class="sy4">::</span><span class="me2">chrono</span><span class="sy4">::</span><span class="me2">is_clock_v</span><span class="sy1"><</span>Clock<span class="sy1">></span></span></span> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw2">false</span></span></span> 则程序为非良构。</span> <span><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></span></span></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>timeout_time</td>
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<td>-</td>
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<td>阻塞到的最大时间点</td>
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</tr>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>若已成功获得互斥的所有权则为 <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> 。</p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<ul>
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<li>任何 <span class="t-c"><span class="mw-geshi cpp source-cpp">mutex<span class="br0">(</span><span class="br0">)</span><span class="sy2">-</span><span class="sy1">></span>try_lock_shared_for<span class="br0">(</span>timeout_time<span class="br0">)</span></span></span> 所抛的异常</li>
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</ul>
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<ul>
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<li>若无关联互斥，则抛出以 <span class="t-lc"><a href="cpp-error-errc.html">std::errc::operation_not_permitted</a></span> 为错误码的 <span class="t-lc"><a href="cpp-error-system_error.html">std::system_error</a></span></li>
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</ul>
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<ul>
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<li>若互斥已被锁，则抛出以 <span class="t-lc"><a href="cpp-error-errc.html">std::errc::resource_deadlock_would_occur</a></span> 为错误码的 <span class="t-lc"><a href="cpp-error-system_error.html">std::system_error</a></span></li>
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</ul>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<td class="mbox-empty-cell"></td>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-shared_lock-lock.html"><span class="t-lines"><span>lock</span></span></a></div>
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</div>
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</td>
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<td>锁定关联的互斥<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-shared_lock-try_lock.html"><span class="t-lines"><span>try_lock</span></span></a></div>
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</div>
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</td>
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<td>尝试锁定关联的互斥<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-shared_lock-try_lock_for.html"><span class="t-lines"><span>try_lock_for</span></span></a></div>
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</div>
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</td>
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<td>尝试锁定关联的互斥，以指定时长<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-shared_lock-unlock.html"><span class="t-lines"><span>unlock</span></span></a></div>
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</div>
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</td>
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<td>解锁关联的互斥<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-thread-unique_lock-try_lock_until.html"><span class="t-lines"><span>try_lock_until</span></span></a></div>
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<td>尝试锁定关联<a href="cpp-named_req-TimedLockable.html"><span style="font-style:italic">可定时锁定</span> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(TimedLockable)</span></a> 互斥，若抵达指定时间点互斥仍不可用则返回<br />
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<span class="t-mark">(<code>std::unique_lock<Mutex></code> 的公开成员函数)</span></td>
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</table>
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</div>
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