117 lines
8.0 KiB
HTML
117 lines
8.0 KiB
HTML
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<title>thrd_sleep</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_thread_thrd_sleep skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading">thrd_sleep</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="c.html">c</a>‎ | <a href="c-thread.html">thread</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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<td>
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<div>定义于头文件 <code><threads.h></code></div>
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<td></td>
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<div><span class="mw-geshi c source-c"><span class="kw4">int</span> thrd_sleep<span class="br0">(</span> <span class="kw4">const</span> <span class="kw1">struct</span> timespec<span class="sy2">*</span> duration,<br />
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<span class="kw1">struct</span> timespec<span class="sy2">*</span> remaining <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-c11">(C11 起)</span></td>
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<p>阻塞当前线程的执行，<i>至少</i>直至经过 <code>duration</code> 所指向的基于 <span class="t-lc">TIME_UTC</span> 的时长。</p>
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<p>若收到不忽略的信号（ <span class="t-lc"><a href="c-program-signal.html">signal</a></span> ），则可以较早地从休眠恢复，。此情况下，若 <code>remaining</code> 非 <span class="t-lc"><a href="c-types-NULL.html">NULL</a></span> ，则存储剩余时长到 <code>remaining</code> 所指向的对象中。</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>duration</td>
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<td>-</td>
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<td>指向要休眠的时长的指针</td>
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</tr>
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<tr class="t-par">
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<td>remaining</td>
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<td>-</td>
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<td>指向要放置中断剩余时间的对象的指针。可为 <span class="t-lc"><a href="c-types-NULL.html">NULL</a></span> ，此情况下忽略它</td>
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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>成功休眠时为 <span class="t-c"><span class="mw-geshi c source-c">​<span class="nu0">0</span>​</span></span>，若出现信号则为 <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">-</span><span class="nu0">1</span></span></span> ，若出现错误则为其他负值。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p><code>duration</code> 和 <code>remaining</code> 可以指向相同对象，这会简化函数在信号后的重新运行。</p>
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<p>实际休眠时间可能长于请求，因为它会被向上舍入到计时器的粒度，而且还因为调度和环境切换开销。</p>
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<p>此函数的 POSIX 等价版本是 <a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/nanosleep.html">nanosleep</a> 。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="c source-c">
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<pre class="de1"><span class="co2">#include <threads.h></span>
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<span class="co2">#include <time.h></span>
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<span class="co2">#include <stdio.h></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
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<span class="br0">{</span>
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<a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"Time: %s"</span>, <a href="c-chrono-ctime.html"><span class="kw516">ctime</span></a><span class="br0">(</span><span class="sy3">&</span><span class="br0">(</span><a href="c-chrono-time_t.html"><span class="kw524">time_t</span></a><span class="br0">)</span><span class="br0">{</span><a href="c-chrono-time.html"><span class="kw513">time</span></a><span class="br0">(</span><a href="c-types-NULL.html"><span class="kw103">NULL</span></a><span class="br0">)</span><span class="br0">}</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
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thrd_sleep<span class="br0">(</span><span class="sy3">&</span><span class="br0">(</span><span class="kw1">struct</span> timespec<span class="br0">)</span><span class="br0">{</span>.<span class="me1">tv_sec</span><span class="sy1">=</span><span class="nu0">1</span><span class="br0">}</span>, <a href="c-types-NULL.html"><span class="kw103">NULL</span></a><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 睡眠 1 秒</span>
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<a href="c-io-fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"Time: %s"</span>, <a href="c-chrono-ctime.html"><span class="kw516">ctime</span></a><span class="br0">(</span><span class="sy3">&</span><span class="br0">(</span><a href="c-chrono-time_t.html"><span class="kw524">time_t</span></a><span class="br0">)</span><span class="br0">{</span><a href="c-chrono-time.html"><span class="kw513">time</span></a><span class="br0">(</span><a href="c-types-NULL.html"><span class="kw103">NULL</span></a><span class="br0">)</span><span class="br0">}</span><span class="br0">)</span><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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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">Time: Mon Feb 2 16:18:41 2015
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Time: Mon Feb 2 16:18:42 2015</pre></div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">引用</span></h3>
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<div class="t-ref-std-11">
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<ul>
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<li>C11 标准（ISO/IEC 9899:2011）：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>7.26.5.7 The thrd_sleep function (p: 385)</li>
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</ul>
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</dd>
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</dl>
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</div>
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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="c-thread-thrd_yield.html"><span class="t-lines"><span>thrd_yield</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div>
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</div>
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</td>
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<td>让出当前时间片段<br />
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<span class="t-mark">(函数)</span></td>
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