124 lines
4.4 KiB
HTML
124 lines
4.4 KiB
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 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_rwlock_destroy()--Destroy Read/Write Lock</title>
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Begin Header Records ========================================== -->
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<!-- NETMG2 SCRIPT A converted by B2H R4.1 (346) (CMS) by HOLTJM at -->
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<!-- RCHVMW2 on 29 Jan 1999 at 10:01:37 -->
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<!--File Edited November 2001 -->
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<!--End Header Records -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<!-- Java sync-link -->
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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_rwlock_destroy()--Destroy Read/Write Lock</h2>
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<div class="box" style="width: 60%;">
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<br>
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Syntax:
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<pre> #include <pthread.h>
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int pthread_rwlock_destroy(pthread_rwlock_t *rwlock); </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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<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_rwlock_destroy</strong>() function destroys the named read/write lock. The destroyed read/write lock can no longer be used.</p>
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<p>If <strong>pthread_rwlock_destroy</strong>() is called on a read/write lock on a mutex that is locked by another thread for either reading or writing, the request fails with an <strong>EBUSY</strong> error.</p>
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<p>If <strong>pthread_rwlock_destroy</strong>() is used by a thread when it owns the read/write lock, and other threads are waiting for the read/write lock to become available (with calls to <strong>pthread_rwlock_rdlock</strong>(), <strong>pthread_rwlock_wrlock</strong>(), <strong>pthread_rwlock_timedrdlock_np</strong>() or <strong>pthread_rwlock_timedwrlock_np</strong>() APIs), the read/write lock is destroyed safely, and the waiting threads wake up with the <strong>EDESTROYED</strong> error. Threads calling <strong>pthread_rwlock_tryrdlock</strong>() or <strong>pthread_rwlock_trywrlock</strong>() return with either the <strong>EBUSY</strong> or <strong>EINVAL</strong> error, depending on when they called those functions.</p>
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<p>Once a read/write lock is created, it cannot be validly copied or moved to a new location.</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>rwlock</strong></dt>
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<dd>(Input) Address of the read/write lock 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_rwlock_destroy</strong>() was successful.</dd>
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<dt><strong>value</strong></dt>
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<dd><strong>pthread_rwlock_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_rwlock_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_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>Example</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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<p>See the <a href="users_86.htm#372485"><strong>pthread_rwlock_init</strong>() example</a>.</p>
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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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