190 lines
4.9 KiB
HTML
190 lines
4.9 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_condattr_init()--Initialize Condition Variable Attributes
|
||
|
|
Object</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_condattr_init()--Initialize Condition Variable Attributes
|
||
|
|
Object</h2>
|
||
|
|
|
||
|
|
<div class="box" style="width: 60%;">
|
||
|
|
<br>
|
||
|
|
Syntax:
|
||
|
|
|
||
|
|
<pre>
|
||
|
|
#include <pthread.h>
|
||
|
|
int pthread_condattr_init(pthread_condattr_t *attr);
|
||
|
|
</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_condattr_init</strong>() function initializes the
|
||
|
|
condition variable attributes object specified by <em>attr</em> to the default
|
||
|
|
attributes. The condition variable attributes object is used to create
|
||
|
|
condition variables with the <strong>pthread_cond_init</strong>() function.</p>
|
||
|
|
|
||
|
|
<br>
|
||
|
|
<h3>Authorities and Locks</h3>
|
||
|
|
|
||
|
|
<p>None.</p>
|
||
|
|
|
||
|
|
<br>
|
||
|
|
<h3>Parameters</h3>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><strong>attr</strong></dt>
|
||
|
|
|
||
|
|
<dd>(Output) The address of the variable to contain the condition variable
|
||
|
|
attributes object</dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<br>
|
||
|
|
<h3>Return Value</h3>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><strong>0</strong></dt>
|
||
|
|
|
||
|
|
<dd><strong>pthread_condattr_init</strong>() was successful.</dd>
|
||
|
|
|
||
|
|
<dt><strong>value</strong></dt>
|
||
|
|
|
||
|
|
<dd><strong>pthread_condattr_init</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_condattr_init</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_69.htm">pthread_condattr_destroy()</a>--Destroy Condition
|
||
|
|
Variable Attributes Object<br><br></li>
|
||
|
|
|
||
|
|
<li><a href="users_75.htm">pthread_cond_init()</a>--Initialize Condition
|
||
|
|
Variable</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>
|
||
|
|
|
||
|
|
<pre>
|
||
|
|
#include <pthread.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include "check.h"
|
||
|
|
|
||
|
|
pthread_cond_t cond;
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
int rc=0;
|
||
|
|
pthread_condattr_t attr;
|
||
|
|
|
||
|
|
printf("Entering testcase\n");
|
||
|
|
|
||
|
|
printf("Create a default condition attribute\n");
|
||
|
|
rc = pthread_condattr_init(&attr);
|
||
|
|
checkResults("pthread_condattr_init\n", rc);
|
||
|
|
|
||
|
|
printf("Create the condition using the condition attributes object\n");
|
||
|
|
rc = pthread_cond_init(&cond, &attr);
|
||
|
|
checkResults("pthread_cond_init()\n", rc);
|
||
|
|
|
||
|
|
printf("- At this point, the condition with its default attributes\n");
|
||
|
|
printf("- Can be used from any threads that want to use it\n");
|
||
|
|
|
||
|
|
printf("Destroy cond attribute\n");
|
||
|
|
rc = pthread_condattr_destroy(&attr);
|
||
|
|
checkResults("pthread_condattr_destroy()\n", rc);
|
||
|
|
|
||
|
|
printf("Destroy condition\n");
|
||
|
|
rc = pthread_cond_destroy(&cond);
|
||
|
|
checkResults("pthread_cond_destroy()\n", rc);
|
||
|
|
|
||
|
|
printf("Main completed\n");
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<p><strong>Output:</strong></p>
|
||
|
|
|
||
|
|
<pre>
|
||
|
|
Entering testcase
|
||
|
|
Create a default condition attribute
|
||
|
|
Create the condition using the condition attributes object
|
||
|
|
- At this point, the condition with its default attributes
|
||
|
|
- Can be used from any threads that want to use it
|
||
|
|
Destroy cond attribute
|
||
|
|
Destroy condition
|
||
|
|
Main completed
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<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>
|
||
|
|
|