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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title>pthread_attr_getscope</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="pthread_attr_getscope"></a> <a name="tag_03_493"></a><!-- pthread_attr_getscope --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_493_01"></a>NAME</h4><blockquote>pthread_attr_getscope, pthread_attr_setscope - get and set the contentionscope attribute (<b>REALTIMETHREADS</b>)</blockquote><h4><a name="tag_03_493_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('THR TPS')">THR TPS</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/pthread.h.html">pthread.h</a>><br><br> int pthread_attr_getscope(const pthread_attr_t *restrict</tt> <i>attr</i><tt>,<br> int *restrict</tt> <i>contentionscope</i><tt>);<br> int pthread_attr_setscope(pthread_attr_t *</tt><i>attr</i><tt>, int</tt> <i>contentionscope</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_493_03"></a>DESCRIPTION</h4><blockquote><p>The <i>pthread_attr_getscope</i>() and <i>pthread_attr_setscope</i>() functions, respectively, shall get and set the<i>contentionscope</i> attribute in the <i>attr</i> object.</p><p>The <i>contentionscope</i> attribute may have the values PTHREAD_SCOPE_SYSTEM, signifying system scheduling contention scope, orPTHREAD_SCOPE_PROCESS, signifying process scheduling contention scope. The symbols PTHREAD_SCOPE_SYSTEM and PTHREAD_SCOPE_PROCESSare defined in the <a href="../basedefs/pthread.h.html"><i><pthread.h></i></a> header.</p></blockquote><h4><a name="tag_03_493_04"></a>RETURN VALUE</h4><blockquote><p>If successful, the <i>pthread_attr_getscope</i>() and <i>pthread_attr_setscope</i>() functions shall return zero; otherwise, anerror number shall be returned to indicate the error.</p></blockquote><h4><a name="tag_03_493_05"></a>ERRORS</h4><blockquote><p>The <i>pthread_attr_setscope</i>() function may fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The value of <i>contentionscope</i> is not valid.</dd><dt>[ENOTSUP]</dt><dd>An attempt was made to set the attribute to an unsupported value.</dd></dl><p>These functions shall not return an error code of [EINTR].</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_493_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_493_07"></a>APPLICATION USAGE</h4><blockquote><p>After these attributes have been set, a thread can be created with the specified attributes using <a href="../functions/pthread_create.html"><i>pthread_create</i>()</a>. Using these routines does not affect the current runningthread.</p></blockquote><h4><a name="tag_03_493_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_493_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_493_10"></a>SEE ALSO</h4><blockquote><p><a href="pthread_attr_destroy.html"><i>pthread_attr_destroy</i>()</a> , <a href="pthread_attr_getinheritsched.html"><i>pthread_attr_getinheritsched</i>()</a> , <a href="pthread_attr_getschedpolicy.html"><i>pthread_attr_getschedpolicy</i>()</a> , <a href="pthread_attr_getschedparam.html"><i>pthread_attr_getschedparam</i>()</a> , <a href="pthread_create.html"><i>pthread_create</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/pthread.h.html"><i><pthread.h></i></a>, <a href="../basedefs/sched.h.html"><i><sched.h></i></a></p></blockquote><h4><a name="tag_03_493_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 5. Included for alignment with the POSIX Threads Extension.</p><p>Marked as part of the Realtime Threads Feature Group.</p></blockquote><h4><a name="tag_03_493_12"></a>Issue 6</h4><blockquote><p>The <i>pthread_attr_getscope</i>() and <i>pthread_attr_setscope</i>() functions are marked as part of the Threads and ThreadExecution Scheduling options.</p><p>The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support the ThreadExecution Scheduling option.</p><p>The <b>restrict</b> keyword is added to the <i>pthread_attr_getscope</i>() prototype for alignment with theISO/IEC 9899:1999 standard.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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