149 lines
6.5 KiB
HTML
149 lines
6.5 KiB
HTML
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<title>pthread_exit</title>
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<basefont size="3"> <a name="pthread_exit"></a> <a name="tag_03_528"></a><!-- pthread_exit -->
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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_528_01"></a>NAME</h4>
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<blockquote>pthread_exit - thread termination</blockquote>
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<h4><a name="tag_03_528_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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void pthread_exit(void *</tt><i>value_ptr</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" 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_528_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>pthread_exit</i>() function shall terminate the calling thread and make the value <i>value_ptr</i> available to any
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successful join with the terminating thread. Any cancelation cleanup handlers that have been pushed and not yet popped shall be
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popped in the reverse order that they were pushed and then executed. After all cancelation cleanup handlers have been executed, if
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the thread has any thread-specific data, appropriate destructor functions shall be called in an unspecified order. Thread
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termination does not release any application visible process resources, including, but not limited to, mutexes and file
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descriptors, nor does it perform any process-level cleanup actions, including, but not limited to, calling any <a href=
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"../functions/atexit.html"><i>atexit</i>()</a> routines that may exist.</p>
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<p>An implicit call to <i>pthread_exit</i>() is made when a thread other than the thread in which <i>main</i>() was first invoked
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returns from the start routine that was used to create it. The function's return value shall serve as the thread's exit status.</p>
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<p>The behavior of <i>pthread_exit</i>() is undefined if called from a cancelation cleanup handler or destructor function that was
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invoked as a result of either an implicit or explicit call to <i>pthread_exit</i>().</p>
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<p>After a thread has terminated, the result of access to local (auto) variables of the thread is undefined. Thus, references to
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local variables of the exiting thread should not be used for the <i>pthread_exit</i>() <i>value_ptr</i> parameter value.</p>
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<p>The process shall exit with an exit status of 0 after the last thread has been terminated. The behavior shall be as if the
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implementation called <a href="../functions/exit.html"><i>exit</i>()</a> with a zero argument at thread termination time.</p>
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</blockquote>
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<h4><a name="tag_03_528_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>The <i>pthread_exit</i>() function cannot return to its caller.</p>
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</blockquote>
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<h4><a name="tag_03_528_05"></a>ERRORS</h4>
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<blockquote>
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<p>No errors are defined.</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_528_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_528_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_528_08"></a>RATIONALE</h4>
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<blockquote>
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<p>The normal mechanism by which a thread terminates is to return from the routine that was specified in the <a href=
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"../functions/pthread_create.html"><i>pthread_create</i>()</a> call that started it. The <i>pthread_exit</i>() function provides
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the capability for a thread to terminate without requiring a return from the start routine of that thread, thereby providing a
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function analogous to <a href="../functions/exit.html"><i>exit</i>()</a>.</p>
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<p>Regardless of the method of thread termination, any cancelation cleanup handlers that have been pushed and not yet popped are
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executed, and the destructors for any existing thread-specific data are executed. This volume of IEEE Std 1003.1-2001
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requires that cancelation cleanup handlers be popped and called in order. After all cancelation cleanup handlers have been
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executed, thread-specific data destructors are called, in an unspecified order, for each item of thread-specific data that exists
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in the thread. This ordering is necessary because cancelation cleanup handlers may rely on thread-specific data.</p>
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<p>As the meaning of the status is determined by the application (except when the thread has been canceled, in which case it is
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PTHREAD_CANCELED), the implementation has no idea what an illegal status value is, which is why no address error checking is
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done.</p>
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</blockquote>
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<h4><a name="tag_03_528_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_528_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="exit.html"><i>exit</i>()</a> , <a href="pthread_create.html"><i>pthread_create</i>()</a> , <a href=
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"pthread_join.html"><i>pthread_join</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/pthread.h.html"><i><pthread.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_528_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_528_12"></a>Issue 6</h4>
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<blockquote>
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<p>The <i>pthread_exit</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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