190 lines
4.9 KiB
HTML
190 lines
4.9 KiB
HTML
<!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_condattr_init()--Initialize Condition Variable Attributes
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Object</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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<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_condattr_init()--Initialize Condition Variable Attributes
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Object</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>
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#include <pthread.h>
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int pthread_condattr_init(pthread_condattr_t *attr);
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</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_condattr_init</strong>() function initializes the
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condition variable attributes object specified by <em>attr</em> to the default
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attributes. The condition variable attributes object is used to create
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condition variables with the <strong>pthread_cond_init</strong>() function.</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>(Output) The address of the variable to contain the condition variable
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attributes object</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_condattr_init</strong>() was successful.</dd>
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<dt><strong>value</strong></dt>
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<dd><strong>pthread_condattr_init</strong>() was not successful. <em>value</em>
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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_condattr_init</strong>() was not successful, the error
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condition returned usually indicates one of the following errors. Under some
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conditions, the value returned could indicate an error other than those listed
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here.</p>
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<dl>
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<dt><em>[EINVAL]</em></dt>
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<dd>
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<p>The value specified for the argument is not correct.</p>
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</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=
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"rzah4hed.htm">Header files for Pthread functions</a>.<br><br></li>
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<li><a href="users_69.htm">pthread_condattr_destroy()</a>--Destroy Condition
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Variable Attributes Object<br><br></li>
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<li><a href="users_75.htm">pthread_cond_init()</a>--Initialize Condition
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Variable</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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<pre>
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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_cond_t cond;
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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_condattr_t attr;
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printf("Entering testcase\n");
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printf("Create a default condition attribute\n");
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rc = pthread_condattr_init(&attr);
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checkResults("pthread_condattr_init\n", rc);
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printf("Create the condition using the condition attributes object\n");
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rc = pthread_cond_init(&cond, &attr);
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checkResults("pthread_cond_init()\n", rc);
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printf("- At this point, the condition with its default attributes\n");
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printf("- Can be used from any threads that want to use it\n");
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printf("Destroy cond attribute\n");
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rc = pthread_condattr_destroy(&attr);
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checkResults("pthread_condattr_destroy()\n", rc);
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printf("Destroy condition\n");
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rc = pthread_cond_destroy(&cond);
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checkResults("pthread_cond_destroy()\n", rc);
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printf("Main completed\n");
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return 0;
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}
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</pre>
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<p><strong>Output:</strong></p>
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<pre>
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Entering testcase
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Create a default condition attribute
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Create the condition using the condition attributes object
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- At this point, the condition with its default attributes
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- Can be used from any threads that want to use it
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Destroy cond attribute
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Destroy condition
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Main completed
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</pre>
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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> | <a href=
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"rzah4mst.htm">Pthread APIs</a> | <a href="aplist.htm">APIs by
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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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