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Ref-docs/POSIX/susv3/functions/pthread_rwlock_destroy.html
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Ref-docs/POSIX/susv3/functions/pthread_rwlock_destroy.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>pthread_rwlock_destroy</title>
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</head>
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<body bgcolor="white">
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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</script>
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<basefont size="3"> <a name="pthread_rwlock_destroy"></a> <a name="tag_03_555"></a><!-- pthread_rwlock_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_555_01"></a>NAME</h4>
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<blockquote>pthread_rwlock_destroy, pthread_rwlock_init - destroy and initialize a read-write lock object</blockquote>
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<h4><a name="tag_03_555_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_rwlock_destroy(pthread_rwlock_t *</tt><i>rwlock</i><tt>);<br>
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int pthread_rwlock_init(pthread_rwlock_t *restrict</tt> <i>rwlock</i><tt>,<br>
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const pthread_rwlockattr_t *restrict</tt> <i>attr</i><tt>); <img src="../images/opt-end.gif"
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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_555_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>pthread_rwlock_destroy</i>() function shall destroy the read-write lock object referenced by <i>rwlock</i> and release
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any resources used by the lock. The effect of subsequent use of the lock is undefined until the lock is reinitialized by another
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call to <i>pthread_rwlock_init</i>(). An implementation may cause <i>pthread_rwlock_destroy</i>() to set the object referenced by
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<i>rwlock</i> to an invalid value. Results are undefined if <i>pthread_rwlock_destroy</i>() is called when any thread holds
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<i>rwlock</i>. Attempting to destroy an uninitialized read-write lock results in undefined behavior.</p>
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<p>The <i>pthread_rwlock_init</i>() function shall allocate any resources required to use the read-write lock referenced by
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<i>rwlock</i> and initializes the lock to an unlocked state with attributes referenced by <i>attr</i>. If <i>attr</i> is NULL, the
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default read-write lock attributes shall be used; the effect is the same as passing the address of a default read-write lock
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attributes object. Once initialized, the lock can be used any number of times without being reinitialized. Results are undefined if
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<i>pthread_rwlock_init</i>() is called specifying an already initialized read-write lock. Results are undefined if a read-write
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lock is used without first being initialized.</p>
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<p>If the <i>pthread_rwlock_init</i>() function fails, <i>rwlock</i> shall not be initialized and the contents of <i>rwlock</i> are
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undefined.</p>
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<p>Only the object referenced by <i>rwlock</i> may be used for performing synchronization. The result of referring to copies of
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that object in calls to <i>pthread_rwlock_destroy</i>(), <a href=
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"../functions/pthread_rwlock_rdlock.html"><i>pthread_rwlock_rdlock</i>()</a>, <a href=
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"../functions/pthread_rwlock_timedrdlock.html"><i>pthread_rwlock_timedrdlock</i>()</a>, <a href=
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"../functions/pthread_rwlock_timedwrlock.html"><i>pthread_rwlock_timedwrlock</i>()</a>, <a href=
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"../functions/pthread_rwlock_tryrdlock.html"><i>pthread_rwlock_tryrdlock</i>()</a>, <a href=
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"../functions/pthread_rwlock_trywrlock.html"><i>pthread_rwlock_trywrlock</i>()</a>, <a href=
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"../functions/pthread_rwlock_unlock.html"><i>pthread_rwlock_unlock</i>()</a>, or <a href=
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"../functions/pthread_rwlock_wrlock.html"><i>pthread_rwlock_wrlock</i>()</a> is undefined.</p>
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</blockquote>
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<h4><a name="tag_03_555_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>If successful, the <i>pthread_rwlock_destroy</i>() and <i>pthread_rwlock_init</i>() functions shall return zero; otherwise, an
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error number shall be returned to indicate the error.</p>
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<p>The [EBUSY] and [EINVAL] error checks, if implemented, act as if they were performed immediately at the beginning of processing
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for the function and caused an error return prior to modifying the state of the read-write lock specified by <i>rwlock</i>.</p>
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</blockquote>
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<h4><a name="tag_03_555_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>pthread_rwlock_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>The implementation has detected an attempt to destroy the object referenced by <i>rwlock</i> while it is locked.</dd>
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<dt>[EINVAL]</dt>
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<dd>The value specified by <i>rwlock</i> is invalid.</dd>
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</dl>
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<p>The <i>pthread_rwlock_init</i>() function shall fail if:</p>
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<dl compact>
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<dt>[EAGAIN]</dt>
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<dd>The system lacked the necessary resources (other than memory) to initialize another read-write lock.</dd>
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<dt>[ENOMEM]</dt>
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<dd>Insufficient memory exists to initialize the read-write lock.</dd>
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<dt>[EPERM]</dt>
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<dd>The caller does not have the privilege to perform the operation.</dd>
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</dl>
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<p>The <i>pthread_rwlock_init</i>() function may fail if:</p>
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<dl compact>
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<dt>[EBUSY]</dt>
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<dd>The implementation has detected an attempt to reinitialize the object referenced by <i>rwlock</i>, a previously initialized but
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not yet destroyed read-write lock.</dd>
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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>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_555_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_555_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_555_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_555_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_555_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="pthread_rwlock_rdlock.html"><i>pthread_rwlock_rdlock</i>()</a> , <a href=
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"pthread_rwlock_timedrdlock.html"><i>pthread_rwlock_timedrdlock</i>()</a> , <a href=
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"pthread_rwlock_timedwrlock.html"><i>pthread_rwlock_timedwrlock</i>()</a> , <a href=
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"pthread_rwlock_tryrdlock.html"><i>pthread_rwlock_tryrdlock</i>()</a> , <a href=
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"pthread_rwlock_trywrlock.html"><i>pthread_rwlock_trywrlock</i>()</a> , <a href=
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"pthread_rwlock_unlock.html"><i>pthread_rwlock_unlock</i>()</a> , <a href=
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"pthread_rwlock_wrlock.html"><i>pthread_rwlock_wrlock</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a
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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_555_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_555_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). The
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initializer macro is also deleted from the SYNOPSIS.</p>
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</li>
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<li>
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<p>The DESCRIPTION is updated as follows:</p>
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<ul>
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<li>
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<p>It explicitly notes allocation of resources upon initialization of a read-write lock object.</p>
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</li>
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<li>
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<p>A paragraph is added specifying that copies of read-write lock objects may not be used.</p>
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</li>
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</ul>
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</li>
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<li>
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<p>An [EINVAL] error is added to the ERRORS section for <i>pthread_rwlock_init</i>(), indicating that the <i>rwlock</i> value is
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invalid.</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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<p>The <b>restrict</b> keyword is added to the <i>pthread_rwlock_init</i>() prototype for alignment with the ISO/IEC 9899:1999
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standard.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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