167 lines
16 KiB
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167 lines
16 KiB
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<title>标准库头文件 <condition_variable></title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">标准库头文件</span> <condition_variable></h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-header.html">header</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>此头文件是<a href="cpp-thread.html">线程支持</a>库的一部分。</p>
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<table class="t-dsc-begin">
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<td colspan="2">
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<h3><span class="mw-headline" id=".E7.B1.BB">类</span></h3>
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</td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div><a href="cpp-thread-condition_variable.html"><span class="t-lines"><span>condition_variable</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>提供与 <span class="t-lc"><a href="cpp-thread-unique_lock.html">std::unique_lock</a></span> 关联的条件变量<br />
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<span class="t-mark">(类)</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-condition_variable_any.html"><span class="t-lines"><span>condition_variable_any</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>提供与任何锁类型关联的条件变量<br />
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<span class="t-mark">(类)</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-cv_status.html"><span class="t-lines"><span>cv_status</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>列出条件变量上定时等待的可能结果<br />
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<span class="t-mark">(枚举)</span></td>
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</tr>
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<tr>
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<td colspan="2">
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<h3><span class="mw-headline" id=".E5.87.BD.E6.95.B0">函数</span></h3>
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</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-notify_all_at_thread_exit.html"><span class="t-lines"><span>notify_all_at_thread_exit</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>安排到在此线程完全结束时对 <code>notify_all</code> 的调用<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">概要</span></h3>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
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<span class="kw1">class</span> condition_variable<span class="sy4">;</span>
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<span class="kw1">class</span> condition_variable_any<span class="sy4">;</span>
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<span class="kw4">void</span> notify_all_at_thread_exit<span class="br0">(</span>condition_variable<span class="sy3">&</span> cond, unique_lock<span class="sy1"><</span>mutex<span class="sy1">></span> lk<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw2">enum</span> <span class="kw1">class</span> cv_status <span class="br0">{</span> no_timeout, timeout <span class="br0">}</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<h4><span class="mw-headline" id=".E7.B1.BB_std::condition_variable">类 <span class="t-lc"><a href="cpp-thread-condition_variable.html">std::condition_variable</a></span></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
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<span class="kw1">class</span> condition_variable <span class="br0">{</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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condition_variable<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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~condition_variable<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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condition_variable<span class="br0">(</span><span class="kw4">const</span> condition_variable<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
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condition_variable<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> condition_variable<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
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<span class="kw4">void</span> notify_one<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw4">void</span> notify_all<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw4">void</span> wait<span class="br0">(</span>unique_lock<span class="sy1"><</span>mutex<span class="sy1">></span><span class="sy3">&</span> lock<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Pred<span class="sy1">></span>
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<span class="kw4">void</span> wait<span class="br0">(</span>unique_lock<span class="sy1"><</span>mutex<span class="sy1">></span><span class="sy3">&</span> lock, Pred pred<span class="br0">)</span><span class="sy4">;</span>
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<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>
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cv_status wait_until<span class="br0">(</span>unique_lock<span class="sy1"><</span>mutex<span class="sy1">></span><span class="sy3">&</span> lock,
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<span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">time_point</span><span class="sy1"><</span>Clock, Duration<span class="sy1">></span><span class="sy3">&</span> abs_time<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration, <span class="kw1">class</span> Pred<span class="sy1">></span>
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<span class="kw4">bool</span> wait_until<span class="br0">(</span>unique_lock<span class="sy1"><</span>mutex<span class="sy1">></span><span class="sy3">&</span> lock,
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<span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">time_point</span><span class="sy1"><</span>Clock, Duration<span class="sy1">></span><span class="sy3">&</span> abs_time, Pred pred<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Rep, <span class="kw1">class</span> Period<span class="sy1">></span>
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cv_status wait_for<span class="br0">(</span>unique_lock<span class="sy1"><</span>mutex<span class="sy1">></span><span class="sy3">&</span> lock,
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<span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">duration</span><span class="sy1"><</span>Rep, Period<span class="sy1">></span><span class="sy3">&</span> rel_time<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Rep, <span class="kw1">class</span> Period, <span class="kw1">class</span> Pred<span class="sy1">></span>
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<span class="kw4">bool</span> wait_for<span class="br0">(</span>unique_lock<span class="sy1"><</span>mutex<span class="sy1">></span><span class="sy3">&</span> lock,
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<span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">duration</span><span class="sy1"><</span>Rep, Period<span class="sy1">></span><span class="sy3">&</span> rel_time, Pred pred<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">using</span> native_handle_type <span class="sy1">=</span> <span class="coMULTI">/* 由实现定义 */</span><span class="sy4">;</span>
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native_handle_type native_handle<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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</div>
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<h4><span class="mw-headline" id=".E7.B1.BB_std::condition_variable_any">类 <span class="t-lc"><a href="cpp-thread-condition_variable_any.html">std::condition_variable_any</a></span></span></h4>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="cpp source-cpp">
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<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
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<span class="kw1">class</span> condition_variable_any <span class="br0">{</span>
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<span class="kw1">public</span><span class="sy4">:</span>
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condition_variable_any<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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~condition_variable_any<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
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condition_variable_any<span class="br0">(</span><span class="kw4">const</span> condition_variable_any<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
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condition_variable_any<span class="sy3">&</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> condition_variable_any<span class="sy3">&</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
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<span class="kw4">void</span> notify_one<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="kw4">void</span> notify_all<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
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<span class="co1">// 不可中断等待</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Lock<span class="sy1">></span>
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<span class="kw4">void</span> wait<span class="br0">(</span>Lock<span class="sy3">&</span> lock<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Lock, <span class="kw1">class</span> Pred<span class="sy1">></span>
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<span class="kw4">void</span> wait<span class="br0">(</span>Lock<span class="sy3">&</span> lock, Pred pred<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Lock, <span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration<span class="sy1">></span>
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cv_status wait_until<span class="br0">(</span>Lock<span class="sy3">&</span> lock,
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<span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">time_point</span><span class="sy1"><</span>Clock, Duration<span class="sy1">></span><span class="sy3">&</span> abs_time<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Lock, <span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration, <span class="kw1">class</span> Pred<span class="sy1">></span>
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<span class="kw4">bool</span> wait_until<span class="br0">(</span>Lock<span class="sy3">&</span> lock, <span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">time_point</span><span class="sy1"><</span>Clock, Duration<span class="sy1">></span><span class="sy3">&</span> abs_time,
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Pred pred<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Lock, <span class="kw1">class</span> Rep, <span class="kw1">class</span> Period<span class="sy1">></span>
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cv_status wait_for<span class="br0">(</span>Lock<span class="sy3">&</span> lock, <span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">duration</span><span class="sy1"><</span>Rep, Period<span class="sy1">></span><span class="sy3">&</span> rel_time<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Lock, <span class="kw1">class</span> Rep, <span class="kw1">class</span> Period, <span class="kw1">class</span> Pred<span class="sy1">></span>
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<span class="kw4">bool</span> wait_for<span class="br0">(</span>Lock<span class="sy3">&</span> lock, <span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">duration</span><span class="sy1"><</span>Rep, Period<span class="sy1">></span><span class="sy3">&</span> rel_time, Pred pred<span class="br0">)</span><span class="sy4">;</span>
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<span class="co1">// 可中断等待</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Lock, <span class="kw1">class</span> Pred<span class="sy1">></span>
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<span class="kw4">bool</span> wait<span class="br0">(</span>Lock<span class="sy3">&</span> lock, stop_token stoken, Pred pred<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Lock, <span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration, <span class="kw1">class</span> Pred<span class="sy1">></span>
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<span class="kw4">bool</span> wait_until<span class="br0">(</span>Lock<span class="sy3">&</span> lock, stop_token stoken,
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<span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">time_point</span><span class="sy1"><</span>Clock, Duration<span class="sy1">></span><span class="sy3">&</span> abs_time, Pred pred<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">template</span><span class="sy1"><</span><span class="kw1">class</span> Lock, <span class="kw1">class</span> Rep, <span class="kw1">class</span> Period, <span class="kw1">class</span> Pred<span class="sy1">></span>
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<span class="kw4">bool</span> wait_for<span class="br0">(</span>Lock<span class="sy3">&</span> lock, stop_token stoken,
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<span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">duration</span><span class="sy1"><</span>Rep, Period<span class="sy1">></span><span class="sy3">&</span> rel_time, Pred pred<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span><span class="sy4">;</span>
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<span class="br0">}</span></pre></div>
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