96 lines
4.8 KiB
HTML
96 lines
4.8 KiB
HTML
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<title>atomic_flag_test_and_set, atomic_flag_test_and_set_explicit</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_atomic_atomic_flag_test_and_set skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading">atomic_flag_test_and_set, atomic_flag_test_and_set_explicit</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-atomic.html">atomic</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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<table class="t-dcl-begin">
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<div>定义于头文件 <code><stdatomic.h></code></div>
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<td></td>
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<td></td>
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<div><span class="mw-geshi c source-c">_Bool atomic_flag_test_and_set<span class="br0">(</span> <span class="kw4">volatile</span> <a href="c-atomic-atomic_flag.html"><span class="kw917">atomic_flag</span></a><span class="sy2">*</span> obj <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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<td>(1)</td>
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<td><span class="t-mark-rev t-since-c11">(C11 起)</span></td>
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<div><span class="mw-geshi c source-c">_Bool atomic_flag_test_and_set_explicit<span class="br0">(</span> <span class="kw4">volatile</span> <a href="c-atomic-atomic_flag.html"><span class="kw917">atomic_flag</span></a><span class="sy2">*</span> obj, <a href="c-atomic-memory_order.html"><span class="kw910">memory_order</span></a> order <span class="br0">)</span><span class="sy4">;</span></span></div>
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<td>(2)</td>
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<td><span class="t-mark-rev t-since-c11">(C11 起)</span></td>
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<p>原子地更改 <code>obj</code> 所指向的 <code>atomic_flag</code> 的状态为设置（ <span class="t-c"><span class="mw-geshi c source-c"><span class="kw2">true</span></span></span> ），并返回先前值。第一版本按 <span class="t-lc"><a href="c-atomic-memory_order.html">memory_order_seq_cst</a></span> 排序内存访问，第二版本按 <code>order</code> 排序内存访问。</p>
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<p>参数是为指向 <code>volatile atomic_flag</code> 的指针，以接受非 volatile 和 <a href="c-language-volatile.html">volatile</a> （例如映射到内存的 I/O ）的 <code>atomic_flag</code> 。</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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<tr class="t-par">
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<td>obj</td>
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<td>-</td>
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<td>指向要修改的 <code>atomic_flag</code> 对象的指针</td>
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</tr>
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<tr class="t-par">
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<td>order</td>
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<td>-</td>
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<td>此操作所用的内存同步顺序：容许所有值</td>
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</tr>
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</table>
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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><code>obj</code> 所指向的 <code>atomic_flag</code> 的先前值。</p>
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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>7.17.8.1 The atomic_flag_test_and_set functions (p: 285-286)</li>
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</ul>
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</dd>
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</dl>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div class="t-dsc-member-div">
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<div><a href="c-atomic-atomic_flag_clear.html"><span class="t-lines"><span>atomic_flag_clear</span><span>atomic_flag_clear_explicit</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>设置 <code>atomic_flag</code> 为 <code>false</code><br />
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<span class="t-mark">(函数)</span></td>
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