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study/Ref-docs/POSIX/susv3/functions/pthread_attr_getscope.html
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study/Ref-docs/POSIX/susv3/functions/pthread_attr_getscope.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<meta name="generator" content="HTML Tidy, see www.w3.org">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>pthread_attr_getscope</title>
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<body bgcolor="white">
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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</script>
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<basefont size="3"> <a name="pthread_attr_getscope"></a> <a name="tag_03_493"></a><!-- pthread_attr_getscope -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_493_01"></a>NAME</h4>
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<blockquote>pthread_attr_getscope, pthread_attr_setscope - get and set the contentionscope attribute (<b>REALTIME
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THREADS</b>)</blockquote>
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<h4><a name="tag_03_493_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('THR TPS')">THR TPS</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/pthread.h.html">pthread.h</a>><br>
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<br>
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int pthread_attr_getscope(const pthread_attr_t *restrict</tt> <i>attr</i><tt>,<br>
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int *restrict</tt> <i>contentionscope</i><tt>);<br>
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int pthread_attr_setscope(pthread_attr_t *</tt><i>attr</i><tt>, int</tt> <i>contentionscope</i><tt>); <img src=
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"../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_493_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>pthread_attr_getscope</i>() and <i>pthread_attr_setscope</i>() functions, respectively, shall get and set the
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<i>contentionscope</i> attribute in the <i>attr</i> object.</p>
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<p>The <i>contentionscope</i> attribute may have the values PTHREAD_SCOPE_SYSTEM, signifying system scheduling contention scope, or
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PTHREAD_SCOPE_PROCESS, signifying process scheduling contention scope. The symbols PTHREAD_SCOPE_SYSTEM and PTHREAD_SCOPE_PROCESS
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are defined in the <a href="../basedefs/pthread.h.html"><i><pthread.h></i></a> header.</p>
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</blockquote>
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<h4><a name="tag_03_493_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>If successful, the <i>pthread_attr_getscope</i>() and <i>pthread_attr_setscope</i>() functions shall return zero; otherwise, an
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error number shall be returned to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_493_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>pthread_attr_setscope</i>() function may fail if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd>The value of <i>contentionscope</i> is not valid.</dd>
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<dt>[ENOTSUP]</dt>
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<dd>An attempt was made to set the attribute to an unsupported value.</dd>
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</dl>
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<p>These functions shall not return an error code of [EINTR].</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_493_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_493_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>After these attributes have been set, a thread can be created with the specified attributes using <a href=
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"../functions/pthread_create.html"><i>pthread_create</i>()</a>. Using these routines does not affect the current running
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thread.</p>
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</blockquote>
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<h4><a name="tag_03_493_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_493_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_493_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="pthread_attr_destroy.html"><i>pthread_attr_destroy</i>()</a> , <a href=
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"pthread_attr_getinheritsched.html"><i>pthread_attr_getinheritsched</i>()</a> , <a href=
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"pthread_attr_getschedpolicy.html"><i>pthread_attr_getschedpolicy</i>()</a> , <a href=
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"pthread_attr_getschedparam.html"><i>pthread_attr_getschedparam</i>()</a> , <a href=
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"pthread_create.html"><i>pthread_create</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/pthread.h.html"><i><pthread.h></i></a>, <a href="../basedefs/sched.h.html"><i><sched.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_493_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 5. Included for alignment with the POSIX Threads Extension.</p>
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<p>Marked as part of the Realtime Threads Feature Group.</p>
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</blockquote>
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<h4><a name="tag_03_493_12"></a>Issue 6</h4>
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<blockquote>
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<p>The <i>pthread_attr_getscope</i>() and <i>pthread_attr_setscope</i>() functions are marked as part of the Threads and Thread
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Execution Scheduling options.</p>
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<p>The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support the Thread
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Execution Scheduling option.</p>
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<p>The <b>restrict</b> keyword is added to the <i>pthread_attr_getscope</i>() prototype for alignment with the
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ISO/IEC 9899:1999 standard.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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POSIX ® is a registered Trademark of The IEEE.<br>
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