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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::</span>atomic_flag_wait, <span style="font-size:0.7em; line-height:130%">std::</span>atomic_flag_wait_explicit</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-atomic.html">atomic</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code><a href="cpp-header-atomic.html">&lt;atomic&gt;</a></code></div>
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<td rowspan="142">(1)</td>
<td rowspan="142"><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">void</span> atomic_flag_wait<span class="br0">(</span> <span class="kw4">const</span> atomic_flag<span class="sy2">*</span> object,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">bool</span> old <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">void</span> atomic_flag_wait<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">volatile</span> atomic_flag<span class="sy2">*</span> object,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<span class="kw4">bool</span> old <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<td rowspan="142">(2)</td>
<td rowspan="142"><span class="t-mark-rev t-since-cxx20">(C++20 &#36215;)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">void</span> atomic_flag_wait_explicit<span class="br0">(</span> <span class="kw4">const</span> atomic_flag<span class="sy2">*</span> object,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">bool</span> old,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a href="cpp-atomic-memory_order.html"><span class="kw2092">std::<span class="me2">memory_order</span></span></a> order <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T <span class="sy1">&gt;</span><br /></span>
<p><span class="kw4">void</span> atomic_flag_wait_explicit<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">volatile</span> atomic_flag<span class="sy2">*</span> object,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">bool</span> old,<br /></p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <a href="cpp-atomic-memory_order.html"><span class="kw2092">std::<span class="me2">memory_order</span></span></a> order <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></div>
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<p>&#36827;&#34892;&#21407;&#23376;&#31561;&#24453;&#25805;&#20316;&#12290;</p>
<p>&#27604;&#36739; <span class="t-c"><span class="mw-geshi cpp source-cpp">object<span class="sy2">-</span><span class="sy1">&gt;</span>test<span class="br0">(</span><a href="cpp-atomic-memory_order.html"><span class="kw2098">std::<span class="me2">memory_order_seq_cst</span></span></a><span class="br0">)</span></span></span> &#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp">object<span class="sy2">-</span><span class="sy1">&gt;</span>test<span class="br0">(</span>order<span class="br0">)</span></span></span> &#19982; <code>old</code> &#65292;&#32780;&#33509;&#23427;&#20204;&#36880;&#20301;&#30456;&#31561;&#21017;&#38459;&#22622;&#30452;&#33267;&#21152;&#36733;&#32467;&#26524;&#30340;&#20540;&#34920;&#31034;&#26356;&#25913;&#25110; <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> &#34987; <span class="t-lc">std::atomic_flag::notify_one()</span> &#25110; <span class="t-lc">std::atomic_flag::notify_all()</span> &#25552;&#37266;&#65288;&#25110;&#32447;&#31243;&#34987;&#34394;&#20551;&#22320;&#38500;&#38459;&#65289;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">object<span class="sy2">-</span><span class="sy1">&gt;</span>wait<span class="br0">(</span>old, <a href="cpp-atomic-memory_order.html"><span class="kw2098">std::<span class="me2">memory_order_seq_cst</span></span></a><span class="br0">)</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#31561;&#20215;&#20110; <span class="t-c"><span class="mw-geshi cpp source-cpp">object<span class="sy2">-</span><span class="sy1">&gt;</span>wait<span class="br0">(</span>old, order<span class="br0">)</span></span></span> &#12290;</div>
<p>&#36825;&#20123;&#20989;&#25968;&#20445;&#35777;&#20165;&#33509;&#20540;&#26356;&#25913;&#25165;&#36820;&#22238;&#65292;&#21363;&#20351;&#24213;&#23618;&#23454;&#29616;&#34394;&#20551;&#22320;&#38500;&#38459;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>object</td>
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<td>&#25351;&#21521;&#35201;&#26816;&#26597;&#24182;&#22312;&#20854;&#19978;&#31561;&#24453;&#30340;&#21407;&#23376;&#26631;&#24535;&#30340;&#25351;&#38024;</td>
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<td>old</td>
<td>-</td>
<td>&#35201;&#26816;&#27979;&#30340;&#21407;&#23376;&#26631;&#24535;&#35937;&#19981;&#20877;&#21547;&#26377;&#30340;&#20540;</td>
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<td>order</td>
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<td>&#27492;&#25805;&#20316;&#25152;&#29992;&#30340;&#20869;&#23384;&#21516;&#27493;&#39034;&#24207;&#65306;&#24517;&#39035;&#19981;&#26159; <span class="t-lc">std::memory_order::release</span> &#25110; <span class="t-lc">std::memory_order::acq_rel</span></td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#65288;&#26080;&#65289;</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E8.A7.A3">&#27880;&#35299;</span></h3>
<p>&#26356;&#25913;&#26816;&#27979;&#30340;&#36825;&#31181;&#24418;&#24335;&#36890;&#24120;&#27604;&#31616;&#21333;&#36718;&#35810;&#25110;&#32431;&#33258;&#26059;&#38145;&#39640;&#25928;&#12290;</p>
<p>&#30001;&#20110; <a rel="nofollow" class="external text" href="https://en.wikipedia.org/wiki/ABA_problem">ABA &#38382;&#39064;</a>&#65292;&#21487;&#33021;&#38169;&#22833;&#20174; <code>old</code> &#21040;&#21478;&#19968;&#20540;&#20877;&#22238;&#21040; <code>old</code> &#30340;&#26356;&#25913;&#65292;&#32780;&#19981;&#38500;&#38459;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<div><a href="cpp-atomic-atomic_flag-notify_one.html"><span class="t-lines"><span>notify_one</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#25552;&#37266;&#33267;&#23569;&#19968;&#20010;&#22312;&#21407;&#23376;&#23545;&#35937;&#19978;&#30340;&#31561;&#24453;&#20013;&#38459;&#22622;&#30340;&#32447;&#31243;<br />
<span class="t-mark">(<code>std::atomic_flag</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-atomic-atomic_flag-notify_all.html"><span class="t-lines"><span>notify_all</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#25552;&#37266;&#25152;&#26377;&#22312;&#21407;&#23376;&#23545;&#35937;&#19978;&#30340;&#31561;&#24453;&#20013;&#38459;&#22622;&#30340;&#32447;&#31243;<br />
<span class="t-mark">(<code>std::atomic_flag</code> &#30340;&#20844;&#24320;&#25104;&#21592;&#20989;&#25968;)</span></td>
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<div><a href="cpp-atomic-atomic_flag_notify_one.html"><span class="t-lines"><span>atomic_flag_notify_one</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#25552;&#37266;&#19968;&#20010;&#22312; <code>atomic_flag_wait</code> &#20013;&#38459;&#22622;&#30340;&#32447;&#31243;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div><a href="cpp-atomic-atomic_flag_notify_all.html"><span class="t-lines"><span>atomic_flag_notify_all</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div>
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<td>&#25552;&#37266;&#25152;&#26377;&#22312; <code>atomic_flag_wait</code> &#20013;&#38459;&#22622;&#30340;&#32447;&#31243;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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