200 lines
5.5 KiB
HTML
200 lines
5.5 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_detach()--Detach 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_detach()--Detach Thread</h2>
|
|
|
|
<div class="box" style="width: 50%;">
|
|
<br>
|
|
Syntax:
|
|
|
|
<pre>
|
|
#include <pthread.h>
|
|
int pthread_detach(pthread_t thread);
|
|
</pre>
|
|
Service Program Name: QP0WPTHR<br>
|
|
<!-- iddvc RMBR -->
|
|
<br>
|
|
Default Public Authority: *USE <br>
|
|
<!-- iddvc RMBR -->
|
|
<br>
|
|
Threadsafe: Yes<br>
|
|
<!-- iddvc RMBR -->
|
|
<br>
|
|
Signal Safe: No<br>
|
|
<!-- iddvc RMBR -->
|
|
<br>
|
|
</div>
|
|
|
|
<p>The <strong>pthread_detach</strong>() function indicates that system
|
|
resources for the specified <em>thread</em> should be reclaimed when the thread
|
|
ends. If the thread is already ended, resources are reclaimed immediately. This
|
|
routine does not cause the thread to end. After
|
|
<strong>pthread_detach</strong>() has been issued, it is not valid to try to
|
|
<strong>pthread_join</strong>() with the target thread.</p>
|
|
|
|
<p>Eventually, you should call <strong>pthread_join</strong>() or
|
|
<strong>pthread_detach</strong>() for every thread that is created joinable
|
|
(with a detach state of <strong>PTHREAD_CREATE_JOINABLE</strong>) so that the
|
|
system can reclaim all resources associated with the thread. Failure to join to
|
|
or detach threads that can be joined causes memory and other resource leaks
|
|
until the process ends.</p>
|
|
|
|
<p>If <em>thread</em> does not represent a valid undetached thread,
|
|
<strong>pthread_detach</strong>() will return ESRCH.</p>
|
|
|
|
<br>
|
|
<h3>Authorities and Locks</h3>
|
|
|
|
<p>None.</p>
|
|
|
|
<br>
|
|
<h3>Parameters</h3>
|
|
|
|
<dl>
|
|
<dt><strong>thread</strong></dt>
|
|
|
|
<dd>(Input) Pthread handle to the target thread</dd>
|
|
</dl>
|
|
|
|
<br>
|
|
<h3>Return Value</h3>
|
|
|
|
<dl>
|
|
<dt><strong>0</strong></dt>
|
|
|
|
<dd><strong>pthread_detach</strong>() was successful.<br><br></dd>
|
|
|
|
<dt><strong>value</strong></dt>
|
|
|
|
<dd><strong>pthread_detach</strong>() was not successful. <em>value</em> is set
|
|
to indicate the error condition.</dd>
|
|
</dl>
|
|
|
|
<br>
|
|
<h3>Error Conditions</h3>
|
|
|
|
<p>If <strong>pthread_detach</strong>() was not successful, the error condition
|
|
returned usually indicates one of the following errors. Under some conditions,
|
|
the value returned could indicate an error other than those listed here.</p>
|
|
|
|
<dl>
|
|
<dt><em>[EINVAL]</em></dt>
|
|
<dd><p>The value specified for the argument is not correct.</p></dd>
|
|
<dt><em>[ESRCH]</em></dt>
|
|
<dd><p>No item could be found that matches the specified value.</p></dd>
|
|
</dl>
|
|
<br>
|
|
<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_18.htm">pthread_exit()</a>--Terminate Calling Thread<br><br></li>
|
|
|
|
<li><a href="users_14.htm">pthread_create()</a>--Create Thread<br><br></li>
|
|
|
|
<li><a href="users_25.htm">pthread_join()</a>--Wait for and Detach Thread<br><br></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 <unistd.h>
|
|
#include <errno.h>
|
|
#include "check.h"
|
|
|
|
void *threadfunc(void *parm)
|
|
{
|
|
printf("Inside secondary thread\n");
|
|
return NULL;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
pthread_t thread;
|
|
int rc=0;
|
|
|
|
printf("Enter Testcase - %s\n", argv[0]);
|
|
|
|
printf("Create thread using attributes that allow join or detach\n");
|
|
rc = pthread_create(&thread, NULL, threadfunc, NULL);
|
|
checkResults("pthread_create()\n", rc);
|
|
|
|
sleep(5);
|
|
|
|
printf("Detach the thread after it terminates\n");
|
|
rc = pthread_detach(thread);
|
|
checkResults("pthread_detach()\n", rc);
|
|
|
|
printf("Detach the thread again (expect ESRCH)\n");
|
|
rc = pthread_detach(thread);
|
|
if (rc != ESRCH) {
|
|
printf("Got an unexpected result! rc=%d\n",
|
|
rc);
|
|
exit(1);
|
|
}
|
|
printf("Second detach fails correctly\n");
|
|
|
|
/* sleep() is not a very robust way to wait for the thread */
|
|
sleep(5);
|
|
printf("Main completed\n");
|
|
return 0;
|
|
}
|
|
</pre>
|
|
|
|
<p><strong>Output:</strong></p>
|
|
|
|
<pre>
|
|
Enter Testcase - QP0WTEST/TPDET0
|
|
Create thread using attributes that allow join or detach
|
|
Inside secondary thread
|
|
Detach the thread after it terminates
|
|
Detach the thread again (expect ESRCH)
|
|
Second detach fails correctly
|
|
Main completed
|
|
</pre>
|
|
<br>
|
|
<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>
|
|
|