142 lines
4.8 KiB
HTML
142 lines
4.8 KiB
HTML
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<title>sem_destroy</title>
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<basefont size="3"> <a name="sem_destroy"></a> <a name="tag_03_629"></a><!-- sem_destroy -->
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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_629_01"></a>NAME</h4>
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<blockquote>sem_destroy - destroy an unnamed semaphore (<b>REALTIME</b>)</blockquote>
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<h4><a name="tag_03_629_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('SEM')">SEM</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/semaphore.h.html">semaphore.h</a>><br>
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<br>
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int sem_destroy(sem_t *</tt><i>sem</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_629_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>sem_destroy</i>() function shall destroy the unnamed semaphore indicated by <i>sem</i>. Only a semaphore that was created
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using <a href="../functions/sem_init.html"><i>sem_init</i>()</a> may be destroyed using <i>sem_destroy</i>(); the effect of calling
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<i>sem_destroy</i>() with a named semaphore is undefined. The effect of subsequent use of the semaphore <i>sem</i> is undefined
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until <i>sem</i> is reinitialized by another call to <a href="../functions/sem_init.html"><i>sem_init</i>()</a>.</p>
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<p>It is safe to destroy an initialized semaphore upon which no threads are currently blocked. The effect of destroying a semaphore
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upon which other threads are currently blocked is undefined.</p>
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</blockquote>
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<h4><a name="tag_03_629_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, a value of zero shall be returned. Otherwise, a value of -1 shall be returned and <i>errno</i> set
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to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_629_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>sem_destroy</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 <i>sem</i> argument is not a valid semaphore.</dd>
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</dl>
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<p>The <i>sem_destroy</i>() function may fail if:</p>
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<dl compact>
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<dt>[EBUSY]</dt>
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<dd>There are currently processes blocked on the semaphore.</dd>
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</dl>
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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_629_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_629_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The <i>sem_destroy</i>() function is part of the Semaphores option and need not be available on all implementations.</p>
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</blockquote>
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<h4><a name="tag_03_629_08"></a>RATIONALE</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_629_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_629_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="semctl.html"><i>semctl</i>()</a> , <a href="semget.html"><i>semget</i>()</a> , <a href="semop.html"><i>semop</i>()</a>
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, <a href="sem_init.html"><i>sem_init</i>()</a> , <a href="sem_open.html"><i>sem_open</i>()</a> , the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/semaphore.h.html"><i><semaphore.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_629_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 Realtime Extension.</p>
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</blockquote>
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<h4><a name="tag_03_629_12"></a>Issue 6</h4>
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<blockquote>
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<p>The <i>sem_destroy</i>() function is marked as part of the Semaphores option.</p>
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<p>The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support the Semaphores
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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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POSIX ® is a registered Trademark of The IEEE.<br>
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