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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>pthread_spin_unlock</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="pthread_spin_unlock"></a> <a name="tag_03_576"></a><!-- pthread_spin_unlock --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_576_01"></a>NAME</h4><blockquote>pthread_spin_unlock - unlock a spin lock object (<b>ADVANCED REALTIME THREADS</b>)</blockquote><h4><a name="tag_03_576_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('THR SPI')">THR SPI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/pthread.h.html">pthread.h</a>><br><br> int pthread_spin_unlock(pthread_spinlock_t *</tt><i>lock</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_576_03"></a>DESCRIPTION</h4><blockquote><p>The <i>pthread_spin_unlock</i>() function shall release the spin lock referenced by <i>lock</i> which was locked via the <ahref="../functions/pthread_spin_lock.html"><i>pthread_spin_lock</i>()</a> or <a href="../functions/pthread_spin_trylock.html"><i>pthread_spin_trylock</i>()</a> functions. The results are undefined if the lock is notheld by the calling thread. If there are threads spinning on the lock when <i>pthread_spin_unlock</i>() is called, the lock becomesavailable and an unspecified spinning thread shall acquire the lock.</p><p>The results are undefined if this function is called with an uninitialized thread spin lock.</p></blockquote><h4><a name="tag_03_576_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, the <i>pthread_spin_unlock</i>() function shall return zero; otherwise, an error number shall bereturned to indicate the error.</p></blockquote><h4><a name="tag_03_576_05"></a>ERRORS</h4><blockquote><p>The <i>pthread_spin_unlock</i>() function may fail if:</p><dl compact><dt>[EINVAL]</dt><dd>An invalid argument was specified.</dd><dt>[EPERM]</dt><dd>The calling thread does not hold the lock.</dd></dl><p>This function shall not return an error code of [EINTR].</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_576_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_576_07"></a>APPLICATION USAGE</h4><blockquote><p>The <i>pthread_spin_unlock</i>() function is part of the Spin Locks option and need not be provided on all implementations.</p></blockquote><h4><a name="tag_03_576_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_576_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_576_10"></a>SEE ALSO</h4><blockquote><p><a href="pthread_spin_destroy.html"><i>pthread_spin_destroy</i>()</a>, <a href="pthread_spin_lock.html"><i>pthread_spin_lock</i>()</a>, the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/pthread.h.html"><i><pthread.h></i></a></p></blockquote><h4><a name="tag_03_576_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 6. Derived from IEEE Std 1003.1j-2000.</p><p>In the SYNOPSIS, the inclusion of <a href="../basedefs/sys/types.h.html"><i><sys/types.h></i></a> is no longerrequired.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>?? 快捷鍵說明
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