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Ref-docs/POSIX/susv3/functions/pthread_attr_getschedparam.html
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Ref-docs/POSIX/susv3/functions/pthread_attr_getschedparam.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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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_getschedparam</title>
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="pthread_attr_getschedparam"></a> <a name="tag_03_491"></a><!-- pthread_attr_getschedparam -->
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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_491_01"></a>NAME</h4>
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<blockquote>pthread_attr_getschedparam, pthread_attr_setschedparam - get and set the schedparam attribute</blockquote>
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<h4><a name="tag_03_491_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')">THR</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_getschedparam(const pthread_attr_t *restrict</tt> <i>attr</i><tt>,<br>
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struct sched_param *restrict</tt> <i>param</i><tt>);<br>
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int pthread_attr_setschedparam(pthread_attr_t *restrict</tt> <i>attr</i><tt>,<br>
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const struct sched_param *restrict</tt> <i>param</i><tt>); <img src="../images/opt-end.gif"
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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_491_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>pthread_attr_getschedparam</i>(), and <i>pthread_attr_setschedparam</i>() functions, respectively, shall get and set the
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scheduling parameter attributes in the <i>attr</i> argument. The contents of the <i>param</i> structure are defined in the <a href=
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"../basedefs/sched.h.html"><i><sched.h></i></a> header. For the SCHED_FIFO and SCHED_RR policies, the only required member of
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<i>param</i> is <i>sched_priority</i>.</p>
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<p><sup>[<a href="javascript:open_code('TSP')">TSP</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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For the SCHED_SPORADIC policy, the required members of the <i>param</i> structure are <i>sched_priority</i>,
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<i>sched_ss_low_priority</i>, <i>sched_ss_repl_period</i>, <i>sched_ss_init_budget</i>, and <i>sched_ss_max_repl</i>. The specified
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<i>sched_ss_repl_period</i> must be greater than or equal to the specified <i>sched_ss_init_budget</i> for the function to succeed;
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if it is not, then the function shall fail. The value of <i>sched_ss_max_repl</i> shall be within the inclusive range [1,
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{SS_REPL_MAX}] for the function to succeed; if not, the function shall fail. <img src="../images/opt-end.gif" alt="[Option End]"
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border="0"></p>
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</blockquote>
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<h4><a name="tag_03_491_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>If successful, the <i>pthread_attr_getschedparam</i>() and <i>pthread_attr_setschedparam</i>() functions shall return zero;
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otherwise, an error number shall be returned to indicate the error.</p>
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</blockquote>
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<h4><a name="tag_03_491_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>pthread_attr_setschedparam</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>param</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_491_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_491_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_491_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_491_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_491_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_getscope.html"><i>pthread_attr_getscope</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_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_491_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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</blockquote>
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<h4><a name="tag_03_491_12"></a>Issue 6</h4>
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<blockquote>
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<p>The <i>pthread_attr_getschedparam</i>() and <i>pthread_attr_setschedparam</i>() functions are marked as part of the Threads
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option.</p>
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<p>The SCHED_SPORADIC scheduling policy is added for alignment with IEEE Std 1003.1d-1999.</p>
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<p>The <b>restrict</b> keyword is added to the <i>pthread_attr_getschedparam</i>() and <i>pthread_attr_setschedparam</i>()
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prototypes for alignment with the 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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