188 lines
5.6 KiB
HTML
188 lines
5.6 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_cleanup_pop()--Pop Cleanup Handler off of Cancellation Cleanup
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Stack</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 -->
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<!--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_cleanup_pop()--Pop Cleanup Handler off of Cancellation Cleanup
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Stack</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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void pthread_cleanup_pop(int execute);
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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: No<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_cleanup_pop</strong>() function pops the last cleanup
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handler from the cancellation cleanup stack. If the <em>execute</em> parameter
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is nonzero, the handler is called with the argument specified by the <strong>
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pthread_cleanup_push</strong>() call with which the handler was registered.</p>
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<p>The <strong>pthread_cleanup_push</strong>() and the matching <strong>
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pthread_cleanup_pop</strong>() call should be in the same lexical scope (that is,
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same level of brackets {}).</p>
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<p>When the thread calls <strong>pthread_exit</strong>() or is cancelled by
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<strong>pthread_cancel</strong>(), the cancellation cleanup handlers are called
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with the argument specified by the <strong>pthread_cleanup_push</strong>() call
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that the handler was registered with.</p>
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<p>During this thread cancellation cleanup, the thread calls cancellation
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cleanup handlers with cancellation disabled until the last cancellation cleanup
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handler returns. The handlers are called in Last In, First Out (LIFO) order.
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Automatic storage for the invocation stack frame of the function that
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registered the handler is still present when the cancellation cleanup handler
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is executed.</p>
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<p>When a cancellation cleanup handler is called because of a call to <strong>
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pthread_cleanup_pop</strong>(1), the cancellation cleanup handler does not
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necessarily run with cancellation disabled. The cancellation state and
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cancellation type are not changed by a call to <strong>
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pthread_cleanup_pop</strong>(1).</p>
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<p>A cancellation cleanup handler should not exit using <strong>
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longjmp</strong>() or <strong>siglongjmp</strong>(). If a cleanup handler takes
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an exception, the exception condition is handled and ignored and processing
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continues. You can look in the job log of the job to see exception messages
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generated by cancellation cleanup handlers.</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>execute</strong></dt>
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<dd>(Input) Boolean value indicating whether the cancellation cleanup handler
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should be executed</dd>
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</dl>
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<br>
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<h3>Return Value</h3>
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<p>None.</p>
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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_39.htm">pthread_cancel()</a>--Cancel Thread<br><br></li>
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<li><a href="users_42.htm">pthread_cleanup_push()</a>--Push Cleanup Handler onto
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Cancellation Cleanup Stack<br><br></li>
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<li><a href="users_18.htm">pthread_exit()</a>--Terminate Calling Thread</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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void cleanupHandler(void *arg)
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{
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printf("In the cleanup handler\n");
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}
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void *threadfunc(void *parm)
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{
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printf("Entered secondary thread, you should see the cleanup handler\n");
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pthread_cleanup_push(cleanupHandler, NULL);
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sleep(1); /* Simulate more code here */
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pthread_cleanup_pop(1);
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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;
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int rc=0;
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printf("Enter Testcase - %s\n", argv[0]);
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/* Create a thread using default attributes */
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printf("Create thread using the NULL attributes\n");
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rc = pthread_create(&thread, NULL, threadfunc, NULL);
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checkResults("pthread_create(NULL)\n", rc);
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/* sleep() is not a very robust way to wait for the thread */
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sleep(5);
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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/TPCLPO0
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Create thread using the NULL attributes
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Entered secondary thread, you should see the cleanup handler
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In the cleanup handler
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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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