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<title>&#26631;&#20934;&#24211;&#22836;&#25991;&#20214; &lt;semaphore&gt;</title>
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">&#26631;&#20934;&#24211;&#22836;&#25991;&#20214;</span> &lt;semaphore&gt;</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="cpp.html">cpp</a>&lrm; | <a href="cpp-header.html">header</a></span></div>
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<p>&#27492;&#22836;&#25991;&#20214;&#26159;<a href="cpp-thread.html">&#32447;&#31243;&#25903;&#25345;</a>&#24211;&#30340;&#19968;&#37096;&#20998;&#12290;</p>
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<h3><span class="mw-headline" id=".E7.B1.BB">&#31867;</span></h3>
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<div><a href="cpp-thread-counting_semaphore.html"><span class="t-lines"><span>counting_semaphore</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>&#23454;&#29616;&#38750;&#36127;&#36164;&#28304;&#35745;&#25968;&#30340;&#20449;&#21495;&#37327;<br />
<span class="t-mark">(&#31867;&#27169;&#26495;)</span></td>
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<div><a href="cpp-thread-counting_semaphore.html"><span class="t-lines"><span>binary_semaphore</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>&#20165;&#25317;&#26377;&#20108;&#20010;&#29366;&#24577;&#30340;&#20449;&#21495;&#37327;<br />
<span class="t-mark">(typedef)</span></td>
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<h3><span class="mw-headline" id=".E6.A6.82.E8.A6.81">&#27010;&#35201;</span></h3>
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<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>ptrdiff_t LeastMaxValue <span class="sy1">=</span> <span class="coMULTI">/* &#23454;&#29616;&#23450;&#20041; */</span><span class="sy1">&gt;</span>
<span class="kw1">class</span> counting_semaphore<span class="sy4">;</span>
<span class="kw1">using</span> binary_semaphore <span class="sy1">=</span> counting_semaphore<span class="sy1">&lt;</span><span class="nu0">1</span><span class="sy1">&gt;</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<h4><span class="mw-headline" id=".E7.B1.BB.E6.A8.A1.E6.9D.BF_std::counting_semaphore">&#31867;&#27169;&#26495; <span class="t-lc">std::counting_semaphore</span></span></h4>
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<pre class="de1"><span class="kw1">namespace</span> std <span class="br0">{</span>
<span class="kw1">template</span><span class="sy1">&lt;</span>ptrdiff_t LeastMaxValue <span class="sy1">=</span> <span class="coMULTI">/* &#23454;&#29616;&#23450;&#20041; */</span><span class="sy1">&gt;</span>
<span class="kw1">class</span> counting_semaphore <span class="br0">{</span>
<span class="kw1">public</span><span class="sy4">:</span>
<span class="kw4">static</span> <span class="kw4">constexpr</span> ptrdiff_t max<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw4">constexpr</span> <span class="kw1">explicit</span> counting_semaphore<span class="br0">(</span>ptrdiff_t desired<span class="br0">)</span><span class="sy4">;</span>
~counting_semaphore<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
counting_semaphore<span class="br0">(</span><span class="kw4">const</span> counting_semaphore<span class="sy3">&amp;</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
counting_semaphore<span class="sy3">&amp;</span> operator<span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> counting_semaphore<span class="sy3">&amp;</span><span class="br0">)</span> <span class="sy1">=</span> delete<span class="sy4">;</span>
<span class="kw4">void</span> release<span class="br0">(</span>ptrdiff_t update <span class="sy1">=</span> <span class="nu0">1</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">void</span> acquire<span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">bool</span> try_acquire<span class="br0">(</span><span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> Rep, <span class="kw1">class</span> Period<span class="sy1">&gt;</span>
<span class="kw4">bool</span> try_acquire_for<span class="br0">(</span><span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">duration</span><span class="sy1">&lt;</span>Rep, Period<span class="sy1">&gt;</span><span class="sy3">&amp;</span> rel_time<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">template</span><span class="sy1">&lt;</span><span class="kw1">class</span> Clock, <span class="kw1">class</span> Duration<span class="sy1">&gt;</span>
<span class="kw4">bool</span> try_acquire_until<span class="br0">(</span><span class="kw4">const</span> chrono<span class="sy4">::</span><span class="me2">time_point</span><span class="sy1">&lt;</span>Clock, Duration<span class="sy1">&gt;</span><span class="sy3">&amp;</span> abs_time<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">private</span><span class="sy4">:</span>
ptrdiff_t counter<span class="sy4">;</span> <span class="co1">// &#20165;&#29992;&#20110;&#38416;&#37322;</span>
<span class="br0">}</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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