98 lines
6.0 KiB
HTML
98 lines
6.0 KiB
HTML
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<title>atomic_store, atomic_store_explicit</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_atomic_atomic_store skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading">atomic_store, atomic_store_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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<div>定义于头文件 <code><stdatomic.h></code></div>
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<div><span class="mw-geshi c source-c"><span class="kw4">void</span> atomic_store<span class="br0">(</span> <span class="kw4">volatile</span> A<span class="sy2">*</span> obj , C desired<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"><span class="kw4">void</span> atomic_store_explicit<span class="br0">(</span> <span class="kw4">volatile</span> A<span class="sy2">*</span> obj, C desired, <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>原子地以 <code>desired</code> 替换 <code>obj</code> 所指向的原子对象的值。此操作是原子写操作。</p>
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<p>第一版本按照 <span class="t-lc"><a href="c-atomic-memory_order.html">memory_order_seq_cst</a></span> 排序内存访问，第二版本按照 <code>order</code> 排序内存访问。 <code>order</code> 必须为 <span class="t-lc"><a href="c-atomic-memory_order.html">memory_order_relaxed</a></span> 、 <span class="t-lc"><a href="c-atomic-memory_order.html">memory_order_release</a></span> 或 <span class="t-lc"><a href="c-atomic-memory_order.html">memory_order_seq_cst</a></span> 之一。否则行为未定义。</p>
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<p>这是为所有<a href="c-language-atomic.html">原子对象类型</a> <code>A</code> 定义的<a href="c-language-generic.html">泛型函数</a>。参数为指向 volatile 原子对象的指针，以接受非 volatile 与 <a href="c-language-volatile.html">volatile</a> （例如内存映射 I/O ）的原子对象，而 volatile 语义在应用此操作时保留。 <code>C</code> 为对应 <code>A</code> 的非原子类型。</p>
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<p>泛型函数名是宏或是声明有外部链接的标识符是未指定的。若为访问实际函数压制宏定义（例如像 <span class="t-c"><span class="mw-geshi c source-c"><span class="br0">(</span>atomic_store<span class="br0">)</span><span class="br0">(</span>...<span class="br0">)</span></span></span> 这样加括号），或程序定义拥有泛型函数名的外部标识符，则行为未定义。</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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<td>obj</td>
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<td>-</td>
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<td>指向要修改的原子对象的指针</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>用于此操作的内存同步顺序</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>（无）</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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<li>7.17.7.1 The atomic_store generic functions (p: 282)</li>
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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><a href="c-atomic-atomic_load.html"><span class="t-lines"><span>atomic_load</span><span>atomic_load_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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<td>从原子对象读取值<br />
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<span class="t-mark">(函数)</span></td>
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