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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>pthread_key_delete</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_007_1396"> </a>NAME</h4><blockquote>pthread_key_delete - thread-specific data key deletion</blockquote><h4><a name = "tag_000_007_1397"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="pthread.h.html">pthread.h</a>>int pthread_key_delete(pthread_key_t <i>key</i>);</code></pre></blockquote><h4><a name = "tag_000_007_1398"> </a>DESCRIPTION</h4><blockquote>This function deletes a thread-specific datakey previously returned by<i><a href="pthread_key_create.html">pthread_key_create()</a></i>.The thread-specific data values associated with<i>key</i>need not be NULL at the time<i>pthread_key_delete()</i>is called.It is the responsibility of the applicationto free any application storageor perform any cleanup actions for data structuresrelated to the deleted key or associated thread-specific datain any threads;this cleanup can be done either before or after<i>pthread_key_delete()</i>is called.Any attempt to use<i>key</i>following the call to<i>pthread_key_delete()</i>results in undefined behaviour.<p>The<i>pthread_key_delete()</i>function is callable from within destructor functions.No destructor functions will be invoked by<i>pthread_key_delete()</i>.Any destructor function that may have been associated with<i>key</i>will no longer be called upon thread exit.</blockquote><h4><a name = "tag_000_007_1399"> </a>RETURN VALUE</h4><blockquote>If successful, the<i>pthread_key_delete()</i>function returns zero.Otherwise, an error number is returned to indicate the error.</blockquote><h4><a name = "tag_000_007_1400"> </a>ERRORS</h4><blockquote>The <i>pthread_key_delete()</i>function may fail if:<dl compact><dt>[EINVAL]<dd>The<i>key</i>value is invalid.</dl><p>The<i>pthread_key_delete()</i>function will not return an error code of [EINTR].</blockquote><h4><a name = "tag_000_007_1401"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1402"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1403"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_1404"> </a>SEE ALSO</h4><blockquote><i><a href="pthread_key_create.html">pthread_key_create()</a></i>,<i><a href="pthread.h.html"><pthread.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the POSIX Threads Extension (1003.1c-1995)</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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