230 lines
6.5 KiB
HTML
230 lines
6.5 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_attr_setschedparam()--Set Thread Attributes Object Scheduling
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Parameters</title>
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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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<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_setschedparam()--Set Thread Attributes Object Scheduling
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Parameters</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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#include <sched.h>
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int pthread_attr_setschedparam(pthread_attr_t *attr,
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const 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_setschedparam</strong>() function sets the
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scheduling parameters in the thread attributes object. The supported i5/OS
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scheduling policy is <strong>SCHED_OTHER.</strong> Attempting to set the
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<em>sched_policy</em> field of the <em>param</em> parameter other than
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<strong>SCHED_OTHER</strong> causes the <strong>EINVAL</strong> error. The
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<em>sched_priority</em> field of the <em>param</em> parameter must range from
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<strong>PRIORITY_MIN</strong> to <strong>PRIORITY_MAX</strong> or the
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<strong>ENOTSUP</strong> error occurs.</p>
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<p>All reserved fields in the scheduling parameters structure must be binary
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zero or the <strong>EINVAL</strong> error occurs.</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,
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<strong>pthread_getschedparam</strong>() returns only that 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
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<strong>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/Output) The address of the thread attributes object</dd>
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<dt><strong>param</strong></dt>
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<dd>(Input) Address of the variable containing the scheduling 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_setschedparam</strong>() was successful.</dd>
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<dt><strong>value</strong></dt>
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<dd><strong>pthread_attr_setschedparam</strong>() was not successful.
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<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_attr_setschedparam</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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<dt><em>[ENOTSUP]</em></dt>
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<dd><p>The value specified for the priority argument is not supported.</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_g8.htm">pthread_attr_getschedparam()</a>--Get Thread Attributes
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Object Scheduling Parameters</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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#define BUMP_PRIO 1
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static int thePriority = 0;
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void showSchedParam(pthread_attr_t *a)
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{
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int rc=0;
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struct sched_param param;
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printf("Get scheduling parameters\n");
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rc = pthread_attr_getschedparam(a, &param);
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checkResults("pthread_attr_getschedparam()\n", rc);
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printf("The thread attributes object indicates priority: %d\n",
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param.sched_priority);
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thePriority = param.sched_priority;
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return;
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}
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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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showSchedParam(&pta);
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memset(&param, 0, sizeof(param));
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if (thePriority + BUMP_PRIO <= PRIORITY_MAX_NP) {
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param.sched_priority = thePriority + BUMP_PRIO;
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}
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printf("Setting scheduling parameters\n");
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rc = pthread_attr_setschedparam(&pta, &param);
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checkResults("pthread_attr_setschedparam()\n", rc);
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showSchedParam(&pta);
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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/TASSP0
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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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Setting scheduling parameters
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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><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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