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<title>pthread_condattr_init()--Initialize Condition Variable Attributes
Object</title>
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<h2>pthread_condattr_init()--Initialize Condition Variable Attributes
Object</h2>

<div class="box" style="width: 60%;">
<br>
&nbsp;&nbsp;Syntax: 

<pre>
 #include &lt;pthread.h&gt;
 int pthread_condattr_init(pthread_condattr_t *attr); 
</pre>

&nbsp;&nbsp;Service Program Name: QP0WPTHR<br>
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&nbsp;&nbsp;Default Public Authority: *USE<br>
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&nbsp;&nbsp;Threadsafe: Yes<br>
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<br>
&nbsp;&nbsp;Signal Safe: Yes<br>
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<p>The <strong>pthread_condattr_init</strong>() function initializes the
condition variable attributes object specified by <em>attr</em> to the default
attributes. The condition variable attributes object is used to create
condition variables with the <strong>pthread_cond_init</strong>() function.</p>

<br>
<h3>Authorities and Locks</h3>

<p>None.</p>

<br>
<h3>Parameters</h3>

<dl>
<dt><strong>attr</strong></dt>

<dd>(Output) The address of the variable to contain the condition variable
attributes object</dd>
</dl>

<br>
<h3>Return Value</h3>

<dl>
<dt><strong>0</strong></dt>

<dd><strong>pthread_condattr_init</strong>() was successful.</dd>

<dt><strong>value</strong></dt>

<dd><strong>pthread_condattr_init</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_condattr_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>

<dl>
<dt><em>[EINVAL]</em></dt>

<dd>
<p>The value specified for the argument is not correct.</p>
</dd>
</dl>

<br>
<h3>Related Information</h3>

<ul>
<li>The &lt;<strong>pthread.h</strong>&gt; header file. See <a href=
"rzah4hed.htm">Header files for Pthread functions</a>.<br><br></li>

<li><a href="users_69.htm">pthread_condattr_destroy()</a>--Destroy Condition
Variable Attributes Object<br><br></li>

<li><a href="users_75.htm">pthread_cond_init()</a>--Initialize Condition
Variable</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>
#include &lt;pthread.h&gt;
#include &lt;stdio.h&gt;
#include "check.h"

pthread_cond_t      cond;

int main(int argc, char **argv)
{
  int                   rc=0;
  pthread_condattr_t    attr;

  printf("Entering testcase\n");

  printf("Create a default condition attribute\n");
  rc = pthread_condattr_init(&amp;attr);
  checkResults("pthread_condattr_init\n", rc);

  printf("Create the condition using the condition attributes object\n");
  rc = pthread_cond_init(&amp;cond, &amp;attr);
  checkResults("pthread_cond_init()\n", rc);

  printf("- At this point, the condition with its default attributes\n");
  printf("- Can be used from any threads that want to use it\n");

  printf("Destroy cond attribute\n");
  rc = pthread_condattr_destroy(&amp;attr);
  checkResults("pthread_condattr_destroy()\n", rc);
 
  printf("Destroy condition\n");
  rc = pthread_cond_destroy(&amp;cond);
  checkResults("pthread_cond_destroy()\n", rc);
 
  printf("Main completed\n");
  return 0;
}
</pre>

<p><strong>Output:</strong></p>

<pre>
Entering testcase
Create a default condition attribute
Create the condition using the condition attributes object
- At this point, the condition with its default attributes
- Can be used from any threads that want to use it
Destroy cond attribute
Destroy condition
Main completed
</pre>

<hr>
API introduced: V4R3

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