198 lines
5.6 KiB
HTML
198 lines
5.6 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_attr_getschedparam()--Get Thread Attributes Object Scheduling
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Parameters</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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<!-- Begin Header Records ========================================== -->
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<!-- NETMG2 SCRIPT A converted by B2H R4.1 (346) (CMS) by HOLTJM at -->
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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_attr_getschedparam()--Get Thread Attributes Object Scheduling
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Parameters</h2>
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<div class="box" style="width: 70%;">
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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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#include <sched.h>
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int pthread_attr_getschedparam(const pthread_attr_t *attr,
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struct sched_param *param);
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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_attr_getschedparam</strong>() function returns the
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scheduling parameters attribute from the thread attributes object. The default
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i5/OS scheduling policy is SCHED_OTHER and cannot be changed to another
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scheduling policy.</p>
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<p>The <em>sched_policy</em> field of the <em>param</em> parameter is always
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returned as <strong>SCHED_OTHER</strong>. The sched_priority field of the <em>
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param</em> structure is set to the priority of the target thread at the time of
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the call.</p>
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<p><strong>Note:</strong> Do not use <strong>pthread_setschedparam</strong>()
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to set the priority of a thread if you also use another mechanism (outside of
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the pthread APIs) to set the priority of a thread. If you do, <strong>
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pthread_getschedparam</strong>() returns only the information that was
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set by the pthread interfaces. (<strong>pthread_setschedparam</strong>() or
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modification of the thread attribute using <strong>
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pthread_attr_setschedparam</strong>()).</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>(Input) The address of the thread attributes object</dd>
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<dt><strong>param</strong></dt>
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<dd>(Output) The address of the variable to contain the returned scheduling
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parameters</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_attr_getschedparam</strong>() was successful.</dd>
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<dt><strong>value</strong></dt>
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<dd><strong>pthread_attr_getschedparam</strong>() was not successful. <em>
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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_attr_getschedparam</strong>() was not successful, the
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error condition returned usually indicates one of the following errors. Under
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some conditions, the value returned could indicate an error other than those
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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=
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"rzah4hed.htm">Header files for Pthread functions</a>.<br><br></li>
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<li>The <<strong>sched.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_12.htm">pthread_attr_setschedparam()--Set Thread Attributes
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Object Scheduling Parameters.</a></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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#define _MULTI_THREADED
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#include <pthread.h>
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#include <sched.h>
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#include <stdio.h>
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#include "check.h"
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int main(int argc, char **argv)
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{
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pthread_t thread;
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int rc=0;
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pthread_attr_t pta;
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struct sched_param param;
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printf("Enter Testcase - %s\n", argv[0]);
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printf("Create a thread attributes object\n");
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rc = pthread_attr_init(&pta);
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checkResults("pthread_attr_init()\n", rc);
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printf("Get scheduling parameters\n");
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rc = pthread_attr_getschedparam(&pta, &param);
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checkResults("pthread_attr_getschedparam()\n", rc);
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printf("The thread attributes object indicates: ");
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printf("priority %d\n", param.sched_priority);
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printf("Destroy thread attributes object\n");
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rc = pthread_attr_destroy(&pta);
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checkResults("pthread_attr_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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Enter Testcase - QP0WTEST/TAGSP0
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Create a thread attributes object
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Get scheduling parameters
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The thread attributes object indicates: priority 0
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Destroy thread attributes object
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Main completed
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</pre>
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<br>
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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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