166 lines
5.0 KiB
HTML
166 lines
5.0 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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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_init()--Initialize Mutex Attributes Object</title>
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</script>
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<a name="Top_Of_Page"></a>
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<h2>pthread_mutexattr_init()--Initialize Mutex Attributes Object</h2>
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<div class="box" style="width: 60%;">
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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_init(pthread_mutexattr_t *attr); </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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<br>
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Threadsafe: Yes<br>
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<br>
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Signal Safe: Yes<br>
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<br>
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</div>
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<p>The <strong>pthread_mutexattr_init</strong>() function initializes the mutex attributes object referenced by <em>attr</em> to the default attributes. The mutex attributes object can be used in a call to <strong>pthread_mutex_init</strong>() to create a mutex.</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/Output) Address of the variable to contain the mutex attributes object</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_init</strong>() was successful.</dd>
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<dt><strong>value</strong></dt>
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<dd><strong>pthread_mutexattr_init</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_init</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_49.htm">pthread_mutexattr_destroy()</a>--Destroy Mutex Attributes Object<br><br></li>
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<li><a href="users_60.htm">pthread_mutex_destroy()</a>--Destroy Mutex<br><br></li>
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<li><a href="users_61.htm">pthread_mutex_init()</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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pthread_mutex_t mutex;
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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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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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printf("Create the mutex using a mutex attributes object\n");
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rc = pthread_mutex_init(&mutex, &mta);
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checkResults("pthread_mutex_init(mta)\n", rc);
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printf("- At this point, the mutex with its default attributes\n");
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printf("- Can be used from any threads that want to use it\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("Destroy mutex\n");
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rc = pthread_mutex_destroy(&mutex);
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checkResults("pthread_mutex_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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Create the mutex using a mutex attributes object
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- At this point, the mutex with its default attributes
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- Can be used from any threads that want to use it
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Destroy mutex attribute
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Destroy mutex
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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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<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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