124 lines
4.3 KiB
HTML
124 lines
4.3 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_set_mutexattr_default_np()--Set Default Mutex Attributes Object Kind Attribute</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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<!-- 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_set_mutexattr_default_np()--Set Default Mutex Attributes Object Kind Attribute</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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#include <sched.h>
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int pthread_set_mutexattr_default_np(int kind); </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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<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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<br>
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</div>
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<p>The <strong>pthread_set_mutexattr_default_np</strong>() function sets the kind attribute in the default mutex attribute object. The default mutex attributes object is used when <strong>pthread_mutex_init</strong>() is called to specify a <strong>NULL</strong> pointer for the mutex attributes object parameter.</p>
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<p>The <em>kind</em> set may be one of <strong>PTHREAD_MUTEX_NONRECURSIVE_NP</strong> or <strong>PTHREAD_MUTEX_RECURSIVE_NP</strong>.</p>
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<p>The <strong>pthread_set_mutexattr_default_np</strong>() function does not affect any currently existing mutex attributes objects, nor does it affect the subsequent behavior of <strong>pthread_mutexattr_init</strong>() or the <strong>PTHREAD_MUTEX_INITIALIZER</strong> macro.</p>
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<p>Calls to <strong>pthread_set_mutexattr_default_np</strong>() change how the run-time of the threads creates default mutexes for all code running in the current process. You can negatively affect other code in your process that uses pthread mutexes by using this function.</p>
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<p><strong>Use of this function is not recommended because it can affect the creation of mutexes that your application does not directly own.</strong></p>
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<p><strong>Note:</strong> This function is not portable.</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>kind</strong></dt>
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<dd>(Input) Variable containing the kind attribute</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_set_mutexattr_default</strong>() was successful.</dd>
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<dt><strong>value</strong></dt>
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<dd><strong>pthread_set_mutexattr_default</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_set_mutexattr_default</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_55.htm">pthread_mutexattr_setkind_np()</a>--Set Mutex Kind Attribute<br><br></li>
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<li><a href="users_61.htm">pthread_mutex_init()</a>--Initialize Mutex</li>
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</ul>
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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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