206 lines
5.4 KiB
HTML
206 lines
5.4 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_getinheritsched()--Get Thread Attribute Object Inherit
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Scheduling Attributes</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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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- Begin Header Records ========================================== -->
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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_attr_getinheritsched()--Get Thread Attribute Object Inherit
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Scheduling Attributes</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_getinheritsched(const pthread_attr_t *attr,
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int *inheritsched);
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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_getinheritsched</strong>() function returns the
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inheritsched attribute from the thread attributes object specified. The
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inheritsched attribute is one of <strong>PTHREAD_EXPLICIT_SCHED</strong> or
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<strong>PTHREAD_INHERIT_SCHED</strong>. The default inheritsched attribute is
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<strong>PTHREAD_EXPLICIT_SCHED</strong>, with a default priority of zero.</p>
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<p>Use the <em>inheritsched</em> parameter to inherit or explicitly specify the
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scheduling attributes when creating new threads.</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) Address of thread creation attributes</dd>
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<dt><strong>inheritsched</strong></dt>
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<dd>(Output) Address of the variable to receive the inheritsched attribute</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_getinheritsched</strong>() was successful.</dd>
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<dt><strong>value</strong></dt>
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<dd><strong>pthread_attr_getinheritsched</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_getinheritsched()</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><a href="users_11.htm">pthread_attr_setinheritsched()--Set Thread Attribute
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Inherit Scheduling Attributes</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 <stdio.h>
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#include <except.h>
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#include "check.h"
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void showInheritSched(pthread_attr_t *attr) {
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int rc;
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int inheritsched;
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rc = pthread_attr_getinheritsched(attr, &inheritsched);
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checkResults("pthread_attr_getinheritsched()\n", rc);
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switch(inheritsched) {
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case PTHREAD_EXPLICIT_SCHED:
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printf("Inherit Sched - PTHREAD_EXPLICIT_SCHED\n");
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break;
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case PTHREAD_INHERIT_SCHED:
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printf("Inherit Sched - PTHREAD_INHERIT_SCHED\n");
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break;
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default:
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printf("Invalid inheritsched attribute!\n");
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exit(1);
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}
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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 attr;
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char c;
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void *status;
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printf("Enter Testcase - %s\n", argv[0]);
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rc = pthread_attr_init(&attr);
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checkResults("pthread_attr_init()\n", rc);
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showInheritSched(&attr);
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rc = pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED);
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checkResults("pthread_attr_setinheritsched()\n", rc);
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showInheritSched(&attr);
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rc = pthread_attr_destroy(&attr);
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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/TPGIS0
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Inherit Sched - PTHREAD_EXPLICIT_SCHED
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Inherit Sched - PTHREAD_INHERIT_SCHED
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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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