111 lines
6.7 KiB
HTML
111 lines
6.7 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_set</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_set 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_set</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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<tr class="t-dcl t-since-c11">
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<div><span class="mw-geshi c source-c"><span class="kw4">int</span> tss_set<span class="br0">(</span> <a href="c-thread.html"><span class="kw1034">tss_t</span></a> tss_id, <span class="kw4">void</span> <span class="sy2">*</span>val <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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<tr class="t-dcl-sep">
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<td></td>
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</tbody>
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<p>设置当前线程的 <code>tss_id</code> 所标识的线程特定存储的值为 <code>val</code> 。不同线程可以设置不同值给同一关键。</p>
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<p>若析构器可用，则不调用它。</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_id</td>
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<td>-</td>
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<td>从 <span class="t-lc"><a href="c-thread-tss_create.html">tss_create</a></span> 获得，且未被 <span class="t-lc"><a href="c-thread-tss_delete.html">tss_delete</a></span> 删除的线程特定存储关键</td>
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</tr>
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<tr class="t-par">
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<td>val</td>
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<td>-</td>
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<td>要设置给线程特定存储的值</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>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=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>此函数的 POSIX 等价版本为 <a rel="nofollow" class="external text" href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_setspecific.html">pthread_setspecific</a> 。</p>
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<p>TSS 的典型用法是存储指向动态分配内存块的指针，这些内存块为调用方线程的使用保留。</p>
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<p>可以在 TSS 析构器中调用 <code>tss_set</code> 。若 TSS 存储中析构器以非 NULL 值退出，则 <span class="t-lc"><a href="c-thread-thrd_exit.html">thrd_exit</a></span> 会重试析构器至多 <span class="t-lc"><a href="c-thread-TSS_DTOR_ITERATIONS.html">TSS_DTOR_ITERATIONS</a></span> 次，之后存储将丢失。</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> <a href="c-thread-tss_create.html"><span class="kw1036">tss_create</span></a><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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tss_set<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>7.26.6.4 The tss_set function (p: 387)</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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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="c-thread-tss_get.html"><span class="t-lines"><span>tss_get</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>从线程特定存储读取<br />
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<span class="t-mark">(函数)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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