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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_equal</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="pthread_equal"></a> <a name="tag_03_527"></a><!-- pthread_equal --> <!--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_527_01"></a>NAME</h4><blockquote>pthread_equal - compare thread IDs</blockquote><h4><a name="tag_03_527_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('THR')">THR</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_equal(pthread_t</tt> <i>t1</i><tt>, pthread_t</tt> <i>t2</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_527_03"></a>DESCRIPTION</h4><blockquote><p>This function shall compare the thread IDs <i>t1</i> and <i>t2</i>.</p></blockquote><h4><a name="tag_03_527_04"></a>RETURN VALUE</h4><blockquote><p>The <i>pthread_equal</i>() function shall return a non-zero value if <i>t1</i> and <i>t2</i> are equal; otherwise, zero shall bereturned.</p><p>If either <i>t1</i> or <i>t2</i> are not valid thread IDs, the behavior is undefined.</p></blockquote><h4><a name="tag_03_527_05"></a>ERRORS</h4><blockquote><p>No errors are defined.</p><p>The <i>pthread_equal</i>() 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_527_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_527_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_527_08"></a>RATIONALE</h4><blockquote><p>Implementations may choose to define a thread ID as a structure. This allows additional flexibility and robustness over using an<b>int</b>. For example, a thread ID could include a sequence number that allows detection of "dangling IDs" (copies of a threadID that has been detached). Since the C language does not support comparison on structure types, the <i>pthread_equal</i>()function is provided to compare thread IDs.</p></blockquote><h4><a name="tag_03_527_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_527_10"></a>SEE ALSO</h4><blockquote><p><a href="pthread_create.html"><i>pthread_create</i>()</a>, <a href="pthread_self.html"><i>pthread_self</i>()</a>, the BaseDefinitions 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_527_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 5. Included for alignment with the POSIX Threads Extension.</p></blockquote><h4><a name="tag_03_527_12"></a>Issue 6</h4><blockquote><p>The <i>pthread_equal</i>() function is marked as part of the Threads option.</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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