117 lines
3.8 KiB
HTML
117 lines
3.8 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>MCH3402 from pointer returned by pthread_join()</title>
|
||
|
|
<!-- Begin Header Records ========================================== -->
|
||
|
|
<!-- 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. -->
|
||
|
|
<!-- Change History: -->
|
||
|
|
<!-- YYMMDD USERID Change description -->
|
||
|
|
<!-- 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>MCH3402 from pointer returned by pthread_join()</h2>
|
||
|
|
|
||
|
|
<p>Be sure that no threads return pointers to items that can be destroyed when
|
||
|
|
a thread terminates. For example, the threads stack is transitory. It needs to
|
||
|
|
exist only for the life of the thread, and it may be destroyed when the thread
|
||
|
|
terminates. If you return the address of an automatic variable or use the
|
||
|
|
address of an automatic variable as an argument to pthread_exit(), you may
|
||
|
|
experience MCH3402 errors when you use the address.</p>
|
||
|
|
|
||
|
|
<br>
|
||
|
|
<h3>Example</h3>
|
||
|
|
|
||
|
|
<p>The following example contains code that brings up the MCH3402 error.</p>
|
||
|
|
|
||
|
|
<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"
|
||
|
|
|
||
|
|
void *threadfunc(void *parm)
|
||
|
|
{
|
||
|
|
int rc = 2;
|
||
|
|
printf("Inside secondary thread, return address of local variable.\n");
|
||
|
|
return &rc; /* THIS IS AN ERROR! */
|
||
|
|
/* AT THIS POINT, THE STACK FOR THIS THREAD MAY BE DESTROYED */
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
pthread_t thread;
|
||
|
|
int rc=1;
|
||
|
|
void *status;
|
||
|
|
|
||
|
|
printf("Enter Testcase - %s\n", argv[0]);
|
||
|
|
|
||
|
|
printf("Create thread that returns status incorrectly\n");
|
||
|
|
rc = pthread_create(&thread, NULL, threadfunc, NULL);
|
||
|
|
checkResults("pthread_create()\n", rc);
|
||
|
|
|
||
|
|
printf("Join to thread\n");
|
||
|
|
rc = pthread_join(thread, &status);
|
||
|
|
checkResults("pthread_join()\n", rc);
|
||
|
|
printf("Checking results from thread. Expect MCH3402\n");
|
||
|
|
/* Monitor for the MCH3402 exception in this range */
|
||
|
|
#pragma exception_handler(TestOk, 0, 0, _C2_ALL, _CTLA_HANDLE_NO_MSG, "MCH3402")
|
||
|
|
rc = *(int *)status;
|
||
|
|
#pragma disable_handler
|
||
|
|
TestFailed:
|
||
|
|
printf("Did not get secondary thread results (exception) as expected!\n");
|
||
|
|
goto TestComplete;
|
||
|
|
|
||
|
|
TestOk: /* Control goes here for an MCH3402 exception */
|
||
|
|
printf("Got an MCH3402 as expected\n");
|
||
|
|
|
||
|
|
TestComplete:
|
||
|
|
printf("Main completed\n");
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<p><strong>Output</strong></p>
|
||
|
|
|
||
|
|
<pre>
|
||
|
|
Enter Testcase - QP0WTEST/TPJOIN7
|
||
|
|
Create thread that returns status incorrectly
|
||
|
|
Join to thread
|
||
|
|
Inside secondary thread, return address of local variable.
|
||
|
|
Checking results from thread. Expect MCH3402
|
||
|
|
Got an MCH3402 as expected
|
||
|
|
Main completed
|
||
|
|
</pre>
|
||
|
|
|
||
|
|
<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>
|
||
|
|
|