198 lines
5.6 KiB
HTML
198 lines
5.6 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_attr_getschedparam()--Get Thread Attributes Object Scheduling
|
|
Parameters</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_attr_getschedparam()--Get Thread Attributes Object Scheduling
|
|
Parameters</h2>
|
|
|
|
<div class="box" style="width: 70%;">
|
|
<br>
|
|
Syntax:
|
|
<pre>
|
|
#include <pthread.h>
|
|
#include <sched.h>
|
|
int pthread_attr_getschedparam(const pthread_attr_t *attr,
|
|
struct sched_param *param);
|
|
</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_attr_getschedparam</strong>() function returns the
|
|
scheduling parameters attribute from the thread attributes object. The default
|
|
i5/OS scheduling policy is SCHED_OTHER and cannot be changed to another
|
|
scheduling policy.</p>
|
|
|
|
<p>The <em>sched_policy</em> field of the <em>param</em> parameter is always
|
|
returned as <strong>SCHED_OTHER</strong>. The sched_priority field of the <em>
|
|
param</em> structure is set to the priority of the target thread at the time of
|
|
the call.</p>
|
|
|
|
<p><strong>Note:</strong> Do not use <strong>pthread_setschedparam</strong>()
|
|
to set the priority of a thread if you also use another mechanism (outside of
|
|
the pthread APIs) to set the priority of a thread. If you do, <strong>
|
|
pthread_getschedparam</strong>() returns only the information that was
|
|
set by the pthread interfaces. (<strong>pthread_setschedparam</strong>() or
|
|
modification of the thread attribute using <strong>
|
|
pthread_attr_setschedparam</strong>()).</p>
|
|
|
|
<br>
|
|
<h3>Authorities and Locks</h3>
|
|
|
|
<p>None.</p>
|
|
|
|
<br>
|
|
<h3>Parameters</h3>
|
|
|
|
<dl>
|
|
<dt><strong>attr</strong></dt>
|
|
|
|
<dd>(Input) The address of the thread attributes object</dd>
|
|
|
|
<dt><strong>param</strong></dt>
|
|
|
|
<dd>(Output) The address of the variable to contain the returned scheduling
|
|
parameters</dd>
|
|
</dl>
|
|
|
|
<br>
|
|
<h3>Return Value</h3>
|
|
|
|
<dl>
|
|
<dt><strong>0</strong></dt>
|
|
|
|
<dd><strong>pthread_attr_getschedparam</strong>() was successful.</dd>
|
|
|
|
<dt><strong>value</strong></dt>
|
|
|
|
<dd><strong>pthread_attr_getschedparam</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_attr_getschedparam</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>The <<strong>sched.h</strong>> header file. See <a href=
|
|
"rzah4hed.htm">Header files for Pthread functions</a>.<br><br></li>
|
|
|
|
<li><a href="users_12.htm">pthread_attr_setschedparam()--Set Thread Attributes
|
|
Object Scheduling Parameters.</a></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>
|
|
#define _MULTI_THREADED
|
|
#include <pthread.h>
|
|
#include <sched.h>
|
|
#include <stdio.h>
|
|
#include "check.h"
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
pthread_t thread;
|
|
int rc=0;
|
|
pthread_attr_t pta;
|
|
struct sched_param param;
|
|
|
|
printf("Enter Testcase - %s\n", argv[0]);
|
|
|
|
printf("Create a thread attributes object\n");
|
|
rc = pthread_attr_init(&pta);
|
|
checkResults("pthread_attr_init()\n", rc);
|
|
|
|
printf("Get scheduling parameters\n");
|
|
rc = pthread_attr_getschedparam(&pta, &param);
|
|
checkResults("pthread_attr_getschedparam()\n", rc);
|
|
|
|
printf("The thread attributes object indicates: ");
|
|
printf("priority %d\n", param.sched_priority);
|
|
|
|
printf("Destroy thread attributes object\n");
|
|
rc = pthread_attr_destroy(&pta);
|
|
checkResults("pthread_attr_destroy()\n", rc);
|
|
|
|
printf("Main completed\n");
|
|
return 0;
|
|
}
|
|
</pre>
|
|
|
|
<p><strong>Output:</strong></p>
|
|
|
|
<pre>
|
|
Enter Testcase - QP0WTEST/TAGSP0
|
|
Create a thread attributes object
|
|
Get scheduling parameters
|
|
The thread attributes object indicates: priority 0
|
|
Destroy thread attributes object
|
|
Main completed
|
|
</pre>
|
|
<br>
|
|
<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>
|
|
|