98 lines
6.8 KiB
HTML
98 lines
6.8 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>tss_create</title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_thread_tss_create skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading">tss_create</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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<table class="t-dcl-begin">
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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>
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<td></td>
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<td></td>
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<div><span class="mw-geshi c source-c"><span class="kw4">int</span> tss_create<span class="br0">(</span> <a href="c-thread.html"><span class="kw1034">tss_t</span></a><span class="sy2">*</span> tss_key, <a href="c-thread.html"><span class="kw1035">tss_dtor_t</span></a> destructor <span class="br0">)</span><span class="sy4">;</span></span></div>
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</td>
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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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<td></td>
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<p>创建新的线程特定存储关键，并将它存储于 <code>tss_key</code> 所指向的对象。尽管不同线程可能使用相同的关键值，由 <span class="t-lc"><a href="c-thread-tss_set.html">tss_set</a></span> 绑定到关键的值在每个线程基础上维护，并且在调用方线程的生命中保持存在。</p>
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<p>所有既存线程中，新建的关键被关联到值 <span class="t-lc"><a href="c-types-NULL.html">NULL</a></span> ，而在创建线程时，将所有 TSS 关键关联的值被初始化为 <span class="t-lc"><a href="c-types-NULL.html">NULL</a></span> 。</p>
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<p>若 <code>destructor</code> 不是空指针，则亦关联在 <span class="t-lc"><a href="c-thread-thrd_exit.html">thrd_exit</a></span> （但不是 <span class="t-lc"><a href="c-thread-tss_delete.html">tss_delete</a></span> 且不是在以 <span class="t-lc"><a href="c-program-exit.html">exit</a></span> 终止程序时）释放存储时调用的析构器。</p>
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<p>在线程特定存储的析构器内调用 <code>tss_create</code> 导致未定义行为。</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>tss_key</td>
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<td>-</td>
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<td>指向要存储新的线程特定存储关键的内存位置的指针</td>
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</tr>
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<tr class="t-par">
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<td>destructor</td>
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<td>-</td>
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<td>指向要在线程退出时调用的函数的指针</td>
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</tr>
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</table>
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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>此函数的 POSIX 等价版本是 <a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_key_create.html">pthread_key_create</a> 。</p>
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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>若成功则为 <span class="t-lc"><a href="c-thread-thrd_errors.html">thrd_success</a></span> ，否则为 <span class="t-lc"><a href="c-thread-thrd_errors.html">thrd_error</a></span> 。</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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<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
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<td class="mbox-empty-cell"></td>
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<td class="mbox-text" style="">本节未完成<br />
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原因：改进，最好为启发寻找 POSIX 示例</td>
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</tr>
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</table>
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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="kw4">int</span> thread_func<span class="br0">(</span><span class="kw4">void</span> <span class="sy2">*</span>arg<span class="br0">)</span> <span class="br0">{</span>
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<a href="c-thread.html"><span class="kw1034">tss_t</span></a> key<span class="sy4">;</span>
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<span class="kw1">if</span> <span class="br0">(</span><a href="c-thread-thrd_errors.html"><span class="kw1005">thrd_success</span></a> <span class="sy1">==</span> tss_create<span class="br0">(</span><span class="sy3">&</span>key, <a href="c-memory-free.html"><span class="kw406">free</span></a><span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
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<a href="c-thread-tss_set.html"><span class="kw1037">tss_set</span></a><span class="br0">(</span>key, <a href="c-memory-malloc.html"><span class="kw403">malloc</span></a><span class="br0">(</span><span class="nu0">4</span><span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 在 TSS 上存储指针</span>
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<span class="co1">// ...</span>
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<span class="br0">}</span>
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<span class="br0">}</span> <span class="co1">// 对 TSS 上存储的指针调用 free()</span></pre></div>
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</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>7.26.6.1 The tss_create function (p: 386)</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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</div>
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<div class="visualClear"></div>
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</body>
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</html>
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