124 lines
4.4 KiB
HTML
124 lines
4.4 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
|
|
<title>pthread_rwlock_destroy()--Destroy Read/Write Lock</title>
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|
<!-- US Government Users Restricted Rights -->
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|
<!-- Begin Header Records ========================================== -->
|
|
<!-- NETMG2 SCRIPT A converted by B2H R4.1 (346) (CMS) by HOLTJM at -->
|
|
<!-- RCHVMW2 on 29 Jan 1999 at 10:01:37 -->
|
|
<!--File Edited November 2001 -->
|
|
<!--End Header Records -->
|
|
<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
|
|
</head>
|
|
<body>
|
|
|
|
<!-- Java sync-link -->
|
|
<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
|
|
</script>
|
|
|
|
<a name="Top_Of_Page"></a>
|
|
|
|
<h2>pthread_rwlock_destroy()--Destroy Read/Write Lock</h2>
|
|
|
|
<div class="box" style="width: 60%;">
|
|
<br>
|
|
Syntax:
|
|
<pre> #include <pthread.h>
|
|
int pthread_rwlock_destroy(pthread_rwlock_t *rwlock); </pre>
|
|
|
|
Service Program Name: QP0WPTHR<br>
|
|
<!-- iddvc RMBR -->
|
|
<br>
|
|
Default Public Authority: *USE <br>
|
|
<!-- iddvc RMBR -->
|
|
<br>
|
|
Threadsafe: Yes<br>
|
|
<!-- iddvc RMBR -->
|
|
<br>
|
|
Signal Safe: Yes<br>
|
|
<!-- iddvc RMBR -->
|
|
<br>
|
|
</div>
|
|
|
|
<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>
|
|
|
|
<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>
|
|
|
|
<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>
|
|
|
|
<p>Once a read/write lock is created, it cannot be validly copied or moved to a new location.</p>
|
|
|
|
<br>
|
|
<h3>Authorities and Locks</h3>
|
|
|
|
<p>None.</p>
|
|
|
|
<br>
|
|
<h3>Parameters</h3>
|
|
|
|
<dl>
|
|
<dt><strong>rwlock</strong></dt>
|
|
|
|
<dd>(Input) Address of the read/write lock to be destroyed</dd>
|
|
</dl>
|
|
|
|
<br>
|
|
<h3>Return Value</h3>
|
|
|
|
<dl>
|
|
<dt><strong>0</strong></dt>
|
|
|
|
<dd><strong>pthread_rwlock_destroy</strong>() was successful.</dd>
|
|
|
|
<dt><strong>value</strong></dt>
|
|
|
|
<dd><strong>pthread_rwlock_destroy</strong>() was not successful. <em>value</em> is set to indicate the error condition.</dd>
|
|
</dl>
|
|
|
|
<br>
|
|
<h3>Error Conditions</h3>
|
|
|
|
<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>
|
|
|
|
<dl>
|
|
<dt><em>[EINVAL]</em></dt>
|
|
|
|
<dd><p>The value specified for the argument is not correct.</p></dd>
|
|
</dl>
|
|
|
|
<br>
|
|
<h3>Related Information</h3>
|
|
|
|
<ul>
|
|
<li>The <<strong>pthread.h</strong>> header file. See <a href="rzah4hed.htm">Header files for Pthread functions</a>.<br><br></li>
|
|
|
|
<li><a href="users_86.htm">pthread_rwlock_init()</a>--Initialize Read/Write Lock</li>
|
|
</ul>
|
|
|
|
<br>
|
|
<h3>Example</h3>
|
|
<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
|
|
for information pertaining to code examples.</p>
|
|
<p>See the <a href="users_86.htm#372485"><strong>pthread_rwlock_init</strong>() example</a>.</p>
|
|
|
|
<hr>
|
|
API introduced: V4R3
|
|
<hr>
|
|
<center>
|
|
<table cellpadding="2" cellspacing="2">
|
|
<tr align="center">
|
|
<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> |
|
|
<a href="rzah4mst.htm">Pthread APIs</a> |
|
|
<a href="aplist.htm">APIs by category</a></td>
|
|
</tr>
|
|
</table>
|
|
</center>
|
|
|
|
</body>
|
|
</html>
|