129 lines
4.5 KiB
HTML
129 lines
4.5 KiB
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_condattr_getpshared()--Get Process Shared Attribute from Condition Attributes Object</title>
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<a name="Top_Of_Page"></a>
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<h2>pthread_condattr_getpshared()--Get Process Shared Attribute from Condition 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_condattr_getpshared(const pthread_condattr_t *attr, int *pshared); </pre>
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Service Program Name: QP0WPTHR<br>
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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_condattr_getpshared</strong>() function retrieves the current setting of the process shared attribute from the condition attributes object. The process shared attribute indicates whether the condition that is created using the condition attributes object can be shared between threads in separate processes (<strong>PTHREAD_PROCESS_SHARED</strong>) or shared only between threads within the same process (<strong>PTHREAD_PROCESS_PRIVATE</strong>).</p>
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<p>Even if the condition in storage is accessible from two separate processes, it cannot be used from both processes unless the process shared attribute is <strong>PTHREAD_PROCESS_SHARED</strong>.</p>
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<p>The default pshared attribute for condition attributes objects is <strong>PTHREAD_PROCESS_PRIVATE</strong>.</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 variable that contains the condition attributes object</dd>
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<dt><strong>pshared</strong></dt>
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<dd>(Output) Address of the variable to contain the pshared attribute result</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_condattr_getpshared</strong>() was successful.</dd>
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<dt><strong>value</strong></dt>
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<dd><strong>pthread_condattr_getpshared</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_condattr_getpshared</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_71.htm">pthread_condattr_init()</a>--Initialize Condition Variable Attributes Object<br><br></li>
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<li><a href="users_72.htm">pthread_condattr_setpshared()</a>--Set Process Shared Attribute in Condition Attributes Object<br><br></li>
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<li><a href="users_75.htm">pthread_cond_init()</a>--Initialize Condition Variable</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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<p>See the example for <a href="users_72.htm#371060"><strong>pthread_condattr_setpshared</strong>()</a>.</p>
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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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