173 lines
6.0 KiB
HTML
173 lines
6.0 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_mutexattr_setname_np()--Set Name in Mutex Attributes Object</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_mutexattr_setname_np()--Set Name in Mutex Attributes Object</h2>
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<div class="box" style="width: 80%;">
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<br>
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Syntax:
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<pre> #include <pthread.h>
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int pthread_mutexattr_setname_np(pthread_mutexattr_t *attr, const char *name); </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: Yes<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_mutexattr_setname_np</strong>() function changes the name attribute associated with the mutex attribute specified by <em>attr</em>. The buffer specified by <em>name</em> must contain a null terminated string of 15 characters or less in length (not including the NULL). If the length of name is greater than 15 characters, the excess characters are ignored. If <em>name</em> is null, the mutex name attribute is reset to the default.</p>
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<p>By default, each pthread_mutex_t has the name "QP0WMTX UNNAMED" associated with it. The name attribute is used by various i5/OS system utilities to aid in debug and service. One example is the WRKJOB command, which has a `work with mutexes' menu choice to show which mutexes are currently locked and which mutexes are being waited for.</p>
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<p>If you should give unique names to all mutexes created to aid in debugging deadlock or performance problems. Use the CL command <strong>WRKJOB</strong>, option 20, to help debug mutex deadlocks.</p>
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<p><strong>Note:</strong> This function is not portable.</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>attr</strong></dt>
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<dd>(Input) Address of the mutex attributes object</dd>
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<dt><strong>name</strong></dt>
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<dd>(Input) Address of a null terminated character buffer containing the name</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_mutexattr_setname_np</strong>() was successful.</dd>
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<dt><strong>value</strong></dt>
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<dd><strong>pthread_mutexattr_setname_np</strong>() was not successful. <em>value</em> is set 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_mutexattr_setname_np</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>
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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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</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="rzah4hed.htm">Header files for Pthread functions</a>.<br><br></li>
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<li><a href="users_51.htm">pthread_mutexattr_getname_np()</a>--Get Name from Mutex Attributes Object<br><br></li>
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<li><a href="users_61.htm">pthread_mutex_initdone()</a>--Initialize Mutex</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>#include <pthread.h>
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#include <stdio.h>
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#include "check.h"
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int main(int argc, char **argv)
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{
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int rc=0;
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pthread_mutexattr_t mta;
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char mutexname[16];
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printf("Entering testcase\n");
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printf("Create a default mutex attribute\n");
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rc = pthread_mutexattr_init(&mta);
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checkResults("pthread_mutexattr_init\n", rc);
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memset(mutexname, 0, sizeof(mutexname));
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printf("Find out what the default name of the mutex is\n");
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rc = pthread_mutexattr_getname_np(&mta, mutexname);
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checkResults("pthread_mutexattr_getname_np()\n", rc);
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printf("The default mutex name will be: %.15s\n", mutexname);
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printf("- At this point, mutexes created with this attribute\n");
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printf("- will show up by name on many i5/OS debug and service screens\n");
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printf("- The default attribute contains a special automatically\n");
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printf("- incrementing name that changes for each mutex created in \n");
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printf("- the process\n");
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printf("Destroy mutex attribute\n");
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rc = pthread_mutexattr_destroy(&mta);
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checkResults("pthread_mutexattr_destroy()\n", rc);
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printf("Main completed\n");
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return 0;
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}</pre>
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<p><strong>Output:</strong></p>
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<pre>Entering testcase
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Create a default mutex attribute
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Find out what the default name of the mutex is
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The default mutex name will be: QP0WMTX UNNAMED
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The new mutex name will be: <My Mutex>
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Destroy mutex attribute
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Main completed</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> |
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<a href="rzah4mst.htm">Pthread APIs</a> |
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<a href="aplist.htm">APIs by 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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