162 lines
5.5 KiB
HTML
162 lines
5.5 KiB
HTML
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<title>pthread_rwlockattr_destroy</title>
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<basefont size="3"> <a name="pthread_rwlockattr_destroy"></a> <a name="tag_03_563"></a><!-- pthread_rwlockattr_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_563_01"></a>NAME</h4>
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<blockquote>pthread_rwlockattr_destroy, pthread_rwlockattr_init - destroy and initialize the read-write lock attributes
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object</blockquote>
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<h4><a name="tag_03_563_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_rwlockattr_destroy(pthread_rwlockattr_t</tt> <i>*attr</i><tt>);<br>
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int pthread_rwlockattr_init(pthread_rwlockattr_t</tt> <i>*attr</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_563_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>pthread_rwlockattr_destroy</i>() function shall destroy a read-write lock attributes object. A destroyed <i>attr</i>
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attributes object can be reinitialized using <i>pthread_rwlockattr_init</i>(); the results of otherwise referencing the object
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after it has been destroyed are undefined. An implementation may cause <i>pthread_rwlockattr_destroy</i>() to set the object
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referenced by <i>attr</i> to an invalid value.</p>
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<p>The <i>pthread_rwlockattr_init</i>() function shall initialize a read-write lock attributes object <i>attr</i> with the default
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value for all of the attributes defined by the implementation.</p>
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<p>Results are undefined if <i>pthread_rwlockattr_init</i>() is called specifying an already initialized <i>attr</i> attributes
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object.</p>
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<p>After a read-write lock attributes object has been used to initialize one or more read-write locks, any function affecting the
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attributes object (including destruction) shall not affect any previously initialized read-write locks.</p>
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</blockquote>
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<h4><a name="tag_03_563_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>If successful, the <i>pthread_rwlockattr_destroy</i>() and <i>pthread_rwlockattr_init</i>() functions shall return zero;
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otherwise, an error number shall be returned to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_563_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>pthread_rwlockattr_destroy</i>() function may fail if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd>The value specified by <i>attr</i> is invalid.</dd>
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</dl>
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<p>The <i>pthread_rwlockattr_init</i>() function shall fail if:</p>
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<dl compact>
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<dt>[ENOMEM]</dt>
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<dd>Insufficient memory exists to initialize the read-write lock attributes object.</dd>
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</dl>
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<p>These functions 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_563_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_563_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_563_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_563_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_563_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="pthread_rwlock_destroy.html"><i>pthread_rwlock_destroy</i>()</a> , <a href=
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"pthread_rwlockattr_getpshared.html"><i>pthread_rwlockattr_getpshared</i>()</a> , <a href=
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"pthread_rwlockattr_setpshared.html"><i>pthread_rwlockattr_setpshared</i>()</a> , the Base Definitions volume of
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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_563_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 5.</p>
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</blockquote>
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<h4><a name="tag_03_563_12"></a>Issue 6</h4>
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<blockquote>
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<p>The following changes are made for alignment with IEEE Std 1003.1j-2000:</p>
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<ul>
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<li>
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<p>The margin code in the SYNOPSIS is changed to THR to indicate that the functionality is now part of the Threads option
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(previously it was part of the Read-Write Locks option in IEEE Std 1003.1j-2000 and also part of the XSI extension).</p>
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</li>
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<li>
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<p>The SEE ALSO section is updated.</p>
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</li>
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</ul>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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