183 lines
4.2 KiB
HTML
183 lines
4.2 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_is_initialthread_np()--Check if Running in the Initial
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Thread</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 --><!--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_is_initialthread_np()--Check if Running in the Initial Thread</h2>
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<div class="box" style="width: 50%;">
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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_is_initialthread_np(void);
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</pre>
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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_is_initialthread_np</strong>() function returns true or
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false, indicating if the current thread is the initial thread of the process. A
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return value true (non 0) indicates that the calling thread is the initial
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thread. A return value of false (0) indicates that the calling thread is
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running in a secondary thread.</p>
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<p><strong>Note:</strong> This function is not portable.</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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<p><br>
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</p>
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<h3>Parameters</h3>
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<p>None.</p>
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<p><br>
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</p>
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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>The calling thread is a secondary thread.</dd>
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<dt><strong>value</strong></dt>
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<dd>The calling thread is the initial thread.</dd>
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</dl>
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<br>
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<h3>Error Conditions</h3>
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<p>None.</p>
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<p><br>
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</p>
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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_24.htm">pthread_is_multithreaded_np()--Check the Current
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Number of Threads</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 "check.h"
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#define NUMTHREADS 1
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void *function(void *parm)
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{
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printf("Inside the function\n");
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if (pthread_is_initialthread_np()) {
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printf("In the initial thread\n");
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}
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else {
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printf("In a secondary thread\n");
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}
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return NULL;
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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[NUMTHREADS];
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int rc=0;
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int i=0;
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printf("Enter Testcase - %s\n", argv[0]);
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printf("Create %d threads\n", NUMTHREADS);
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for (i=0; i<NUMTHREADS; ++i) {
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rc = pthread_create(&thread[i], NULL, function, NULL);
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checkResults("pthread_create()\n", rc);
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printf("Main: Currently %d threads\n",
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pthread_is_initialthread_np() + 1);
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}
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printf("Join to threads\n");
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for (i=0; i<NUMTHREADS; ++i) {
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rc = pthread_join(thread[i], NULL);
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checkResults("pthread_join()\n", rc);
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}
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function(NULL);
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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/TPISIN0
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Create 1 threads
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Join to threads
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Inside the function
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In a secondary thread
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Inside the function
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In the initial thread
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Main completed
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</pre>
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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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