200 lines
5.5 KiB
HTML
200 lines
5.5 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_detach()--Detach 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 -->
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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_detach()--Detach 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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int pthread_detach(pthread_t thread);
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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_detach</strong>() function indicates that system
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resources for the specified <em>thread</em> should be reclaimed when the thread
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ends. If the thread is already ended, resources are reclaimed immediately. This
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routine does not cause the thread to end. After
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<strong>pthread_detach</strong>() has been issued, it is not valid to try to
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<strong>pthread_join</strong>() with the target thread.</p>
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<p>Eventually, you should call <strong>pthread_join</strong>() or
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<strong>pthread_detach</strong>() for every thread that is created joinable
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(with a detach state of <strong>PTHREAD_CREATE_JOINABLE</strong>) so that the
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system can reclaim all resources associated with the thread. Failure to join to
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or detach threads that can be joined causes memory and other resource leaks
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until the process ends.</p>
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<p>If <em>thread</em> does not represent a valid undetached thread,
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<strong>pthread_detach</strong>() will return ESRCH.</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>thread</strong></dt>
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<dd>(Input) Pthread handle to the target thread</dd>
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</dl>
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<br>
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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><strong>pthread_detach</strong>() was successful.<br><br></dd>
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<dt><strong>value</strong></dt>
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<dd><strong>pthread_detach</strong>() was not successful. <em>value</em> is set
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to indicate the error condition.</dd>
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</dl>
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<br>
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<h3>Error Conditions</h3>
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<p>If <strong>pthread_detach</strong>() was not successful, the error condition
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returned usually indicates one of the following errors. Under some conditions,
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the value returned could indicate an error other than those listed here.</p>
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<dl>
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<dt><em>[EINVAL]</em></dt>
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<dd><p>The value specified for the argument is not correct.</p></dd>
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<dt><em>[ESRCH]</em></dt>
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<dd><p>No item could be found that matches the specified value.</p></dd>
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</dl>
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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_18.htm">pthread_exit()</a>--Terminate Calling Thread<br><br></li>
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<li><a href="users_14.htm">pthread_create()</a>--Create Thread<br><br></li>
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<li><a href="users_25.htm">pthread_join()</a>--Wait for and Detach Thread<br><br></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 <unistd.h>
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#include <errno.h>
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#include "check.h"
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void *threadfunc(void *parm)
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{
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printf("Inside secondary thread\n");
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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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printf("Create thread using attributes that allow join or detach\n");
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rc = pthread_create(&thread, NULL, threadfunc, NULL);
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checkResults("pthread_create()\n", rc);
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sleep(5);
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printf("Detach the thread after it terminates\n");
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rc = pthread_detach(thread);
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checkResults("pthread_detach()\n", rc);
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printf("Detach the thread again (expect ESRCH)\n");
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rc = pthread_detach(thread);
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if (rc != ESRCH) {
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printf("Got an unexpected result! rc=%d\n",
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rc);
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exit(1);
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}
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printf("Second detach fails correctly\n");
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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/TPDET0
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Create thread using attributes that allow join or detach
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Inside secondary thread
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Detach the thread after it terminates
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Detach the thread again (expect ESRCH)
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Second detach fails correctly
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Main completed
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</pre>
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<br>
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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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