126 lines
4.1 KiB
HTML
126 lines
4.1 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>pthread_equal</title>
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<basefont size="3"> <a name="pthread_equal"></a> <a name="tag_03_527"></a><!-- pthread_equal -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_527_01"></a>NAME</h4>
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<blockquote>pthread_equal - compare thread IDs</blockquote>
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<h4><a name="tag_03_527_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('THR')">THR</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/pthread.h.html">pthread.h</a>><br>
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<br>
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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]"
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border="0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_527_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>This function shall compare the thread IDs <i>t1</i> and <i>t2</i>.</p>
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</blockquote>
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<h4><a name="tag_03_527_04"></a>RETURN VALUE</h4>
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<blockquote>
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<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 be
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returned.</p>
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<p>If either <i>t1</i> or <i>t2</i> are not valid thread IDs, the behavior is undefined.</p>
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</blockquote>
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<h4><a name="tag_03_527_05"></a>ERRORS</h4>
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<blockquote>
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<p>No errors are defined.</p>
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<p>The <i>pthread_equal</i>() function shall not return an error code of [EINTR].</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_527_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_527_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_527_08"></a>RATIONALE</h4>
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<blockquote>
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<p>Implementations may choose to define a thread ID as a structure. This allows additional flexibility and robustness over using an
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<b>int</b>. For example, a thread ID could include a sequence number that allows detection of "dangling IDs" (copies of a thread
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ID that has been detached). Since the C language does not support comparison on structure types, the <i>pthread_equal</i>()
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function is provided to compare thread IDs.</p>
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</blockquote>
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<h4><a name="tag_03_527_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_527_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="pthread_create.html"><i>pthread_create</i>()</a> , <a href="pthread_self.html"><i>pthread_self</i>()</a> , the Base
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Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/pthread.h.html"><i><pthread.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_527_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 5. Included for alignment with the POSIX Threads Extension.</p>
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</blockquote>
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<h4><a name="tag_03_527_12"></a>Issue 6</h4>
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<blockquote>
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<p>The <i>pthread_equal</i>() function is marked as part of the Threads option.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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