152 lines
5.4 KiB
HTML
152 lines
5.4 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>pthread_detach</title>
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<basefont size="3"> <a name="pthread_detach"></a> <a name="tag_03_526"></a><!-- pthread_detach -->
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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_526_01"></a>NAME</h4>
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<blockquote>pthread_detach - detach a thread</blockquote>
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<h4><a name="tag_03_526_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_detach(pthread_t</tt> <i>thread</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_526_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>pthread_detach</i>() function shall indicate to the implementation that storage for the thread <i>thread</i> can be
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reclaimed when that thread terminates. If <i>thread</i> has not terminated, <i>pthread_detach</i>() shall not cause it to
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terminate. The effect of multiple <i>pthread_detach</i>() calls on the same target thread is unspecified.</p>
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</blockquote>
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<h4><a name="tag_03_526_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>If the call succeeds, <i>pthread_detach</i>() shall return 0; otherwise, an error number shall be returned to indicate the
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error.</p>
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</blockquote>
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<h4><a name="tag_03_526_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>pthread_detach</i>() function shall fail if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd>The implementation has detected that the value specified by <i>thread</i> does not refer to a joinable thread.</dd>
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<dt>[ESRCH]</dt>
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<dd>No thread could be found corresponding to that specified by the given thread ID.</dd>
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</dl>
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<p>The <i>pthread_detach</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_526_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_526_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_526_08"></a>RATIONALE</h4>
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<blockquote>
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<p>The <a href="../functions/pthread_join.html"><i>pthread_join</i>()</a> or <i>pthread_detach</i>() functions should eventually be
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called for every thread that is created so that storage associated with the thread may be reclaimed.</p>
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<p>It has been suggested that a "detach" function is not necessary; the <i>detachstate</i> thread creation attribute is
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sufficient, since a thread need never be dynamically detached. However, need arises in at least two cases:</p>
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<ol>
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<li>
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<p>In a cancelation handler for a <a href="../functions/pthread_join.html"><i>pthread_join</i>()</a> it is nearly essential to have
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a <i>pthread_detach</i>() function in order to detach the thread on which <a href=
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"../functions/pthread_join.html"><i>pthread_join</i>()</a> was waiting. Without it, it would be necessary to have the handler do
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another <a href="../functions/pthread_join.html"><i>pthread_join</i>()</a> to attempt to detach the thread, which would both delay
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the cancelation processing for an unbounded period and introduce a new call to <a href=
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"../functions/pthread_join.html"><i>pthread_join</i>()</a>, which might itself need a cancelation handler. A dynamic detach is
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nearly essential in this case.</p>
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</li>
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<li>
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<p>In order to detach the "initial thread" (as may be desirable in processes that set up server threads).</p>
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</li>
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</ol>
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</blockquote>
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<h4><a name="tag_03_526_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_526_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="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_526_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_526_12"></a>Issue 6</h4>
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<blockquote>
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<p>The <i>pthread_detach</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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