183 lines
4.2 KiB
HTML
183 lines
4.2 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_is_initialthread_np()--Check if Running in the Initial
|
|
Thread</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_is_initialthread_np()--Check if Running in the Initial Thread</h2>
|
|
|
|
<div class="box" style="width: 50%;">
|
|
<br>
|
|
Syntax:
|
|
|
|
<pre>
|
|
#include <pthread.h>
|
|
#include <sched.h>
|
|
int pthread_is_initialthread_np(void);
|
|
</pre>
|
|
|
|
Threadsafe: Yes<br>
|
|
<!-- iddvc RMBR -->
|
|
<br>
|
|
Signal Safe: Yes<br>
|
|
<!-- iddvc RMBR -->
|
|
<br>
|
|
</div>
|
|
|
|
<p>The <strong>pthread_is_initialthread_np</strong>() function returns true or
|
|
false, indicating if the current thread is the initial thread of the process. A
|
|
return value true (non 0) indicates that the calling thread is the initial
|
|
thread. A return value of false (0) indicates that the calling thread is
|
|
running in a secondary thread.</p>
|
|
|
|
<p><strong>Note:</strong> This function is not portable.</p>
|
|
|
|
<br>
|
|
<h3>Authorities and Locks</h3>
|
|
|
|
<p>None.</p>
|
|
|
|
<p><br>
|
|
</p>
|
|
|
|
<h3>Parameters</h3>
|
|
|
|
<p>None.</p>
|
|
|
|
<p><br>
|
|
</p>
|
|
|
|
<h3>Return Value</h3>
|
|
|
|
<dl>
|
|
<dt><strong>0</strong></dt>
|
|
|
|
<dd>The calling thread is a secondary thread.</dd>
|
|
|
|
<dt><strong>value</strong></dt>
|
|
|
|
<dd>The calling thread is the initial thread.</dd>
|
|
</dl>
|
|
|
|
<br>
|
|
<h3>Error Conditions</h3>
|
|
|
|
<p>None.</p>
|
|
|
|
<p><br>
|
|
</p>
|
|
|
|
<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><a href="users_24.htm">pthread_is_multithreaded_np()--Check the Current
|
|
Number of Threads</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 <stdio.h>
|
|
#include "check.h"
|
|
|
|
#define NUMTHREADS 1
|
|
|
|
void *function(void *parm)
|
|
{
|
|
printf("Inside the function\n");
|
|
if (pthread_is_initialthread_np()) {
|
|
printf("In the initial thread\n");
|
|
}
|
|
else {
|
|
printf("In a secondary thread\n");
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
pthread_t thread[NUMTHREADS];
|
|
int rc=0;
|
|
int i=0;
|
|
|
|
printf("Enter Testcase - %s\n", argv[0]);
|
|
|
|
printf("Create %d threads\n", NUMTHREADS);
|
|
|
|
for (i=0; i<NUMTHREADS; ++i) {
|
|
rc = pthread_create(&thread[i], NULL, function, NULL);
|
|
checkResults("pthread_create()\n", rc);
|
|
printf("Main: Currently %d threads\n",
|
|
pthread_is_initialthread_np() + 1);
|
|
}
|
|
|
|
printf("Join to threads\n");
|
|
for (i=0; i<NUMTHREADS; ++i) {
|
|
rc = pthread_join(thread[i], NULL);
|
|
checkResults("pthread_join()\n", rc);
|
|
}
|
|
|
|
function(NULL);
|
|
printf("Main completed\n");
|
|
return 0;
|
|
}
|
|
|
|
</pre>
|
|
|
|
<p><strong>Output:</strong></p>
|
|
|
|
<pre>
|
|
Enter Testcase - QP0WTEST/TPISIN0
|
|
Create 1 threads
|
|
Join to threads
|
|
Inside the function
|
|
In a secondary thread
|
|
Inside the function
|
|
In the initial thread
|
|
Main completed
|
|
</pre>
|
|
|
|
<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>
|
|
|