189 lines
5.8 KiB
HTML
189 lines
5.8 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>pthread_rwlockattr_destroy()--Destroy Read/Write Lock Attribute</title>
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<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<a name="Top_Of_Page"></a>
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<h2>pthread_rwlockattr_destroy()--Destroy Read/Write Lock Attribute</h2>
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<div class="box" style="width: 70%;">
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<br>
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Syntax:
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<pre> #include <pthread.h>
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int pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr); </pre>
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Service Program Name: QP0WPTHR<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE <br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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Signal Safe: Yes<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>pthread_rwlockattr_destroy</strong>() function destroys a read/write lock
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attributes object and allows the systems to reclaim any resources associated with that read/write
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lock attributes object. This does not have an effect on any read/write lock already created using
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this read/write lock attributes object.</p>
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<br>
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<h3>Authorities and Locks</h3>
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<p>None.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>attr</strong></dt>
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<dd>(Input) Address of the read/write lock attributes object to be destroyed</dd>
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</dl>
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<br>
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<h3>Return Value</h3>
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<dl>
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<dt><strong>0</strong></dt>
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<dd><strong>pthread_rwlockattr_destroy</strong>() was successful.</dd>
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<dt><strong>value</strong></dt>
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<dd><strong>pthread_rwlockattr_destroy</strong>() was not successful. <em>value</em> is set to indicate the error condition.</dd>
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</dl>
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<br>
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<h3>Error Conditions</h3>
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<p>If <strong>pthread_rwlockattr_destroy</strong>() was not successful, the error condition returned usually indicates one of the following errors. Under some conditions, the value returned could indicate an error other than those listed here.</p>
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<dl>
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<dt><em>[EINVAL]</em></dt>
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<dd><p>The value specified for the argument is not correct.</p></dd>
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</dl>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li>The <<strong>pthread.h</strong>> header file. See <a href="rzah4hed.htm">Header files for Pthread functions</a>.<br><br></li>
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<li><a href="users_83.htm">pthread_rwlockattr_init()</a>--Initialize Read/Write Lock Attribute<br><br></li>
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<li><a href="users_86.htm">pthread_rwlock_init()</a>--Initialize Read/Write Lock</li>
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</ul>
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<br>
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<h3><a name="371610">Example</a></h3>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<pre>#define _MULTI_THREADED
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#include <pthread.h>
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#include <stdio.h>
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#include "check.h"
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pthread_rwlock_t rwlock1;
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pthread_rwlock_t rwlock2 = PTHREAD_RWLOCK_INITIALIZER;
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int main(int argc, char **argv)
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{
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int rc=0;
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pthread_rwlockattr_t attr;
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printf("Enter Testcase - %s\n", argv[0]);
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printf("Create a default rwlock attribute\n");
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rc = pthread_rwlockattr_init(&attr);
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checkResults("pthread_rwlockattr_init()\n", rc);
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printf("Use the rwlock attributes to created rwlocks here\n");
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rc = pthread_rwlock_init(&rwlock1, &attr);
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checkResults("pthread_rwlock_init()\n", rc);
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printf("The rwlock1 is now ready for use.\n");
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printf("The rwlock2 that was statically initialized was ready when\n"
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"the main routine was entered\n");
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printf("Destroy rwlock attribute\n");
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rc = pthread_rwlockattr_destroy(&attr);
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checkResults("pthread_rwlockattr_destroy()\n", rc);
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printf("Use the rwlocks\n");
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rc = pthread_rwlock_rdlock(&rwlock1);
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checkResults("pthread_rwlock_rdlock()\n", rc);
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rc = pthread_rwlock_wrlock(&rwlock2);
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checkResults("pthread_rwlock_wrlock()\n", rc);
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rc = pthread_rwlock_unlock(&rwlock1);
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checkResults("pthread_rwlock_unlock(1)\n", rc);
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rc = pthread_rwlock_unlock(&rwlock2);
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checkResults("pthread_rwlock_unlock(2)\n", rc);
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printf("Destroy the rwlocks\n");
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rc = pthread_rwlock_destroy(&rwlock1);
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checkResults("pthread_rwlock_destroy(1)\n", rc);
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rc = pthread_rwlock_destroy(&rwlock2);
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esults("pthread_rwlock_destroy(2)\n", rc);
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printf("Main completed\n");
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return 0;
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}</pre>
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<p><strong>Output:</strong></p>
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<pre>Enter Testcase - QP0WTEST/TPRWLAI0
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Create a default rwlock attribute
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Use the rwlock attributes to created rwlocks here
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The rwlock is now ready for use.
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The rwlock that was statically initialized was ready when
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the main routine was entered
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Destroy rwlock attribute
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Use the rwlocks
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Destroy the rwlocks
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Main completed</pre>
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<br>
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<hr>
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API introduced: V4R3
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> |
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<a href="rzah4mst.htm">Pthread APIs</a> |
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<a href="aplist.htm">APIs by category</a></td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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