205 lines
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205 lines
5.0 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of SCHED_SETPARAM</TITLE>
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</HEAD><BODY>
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<H1>SCHED_SETPARAM</H1>
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Section: Linux Programmer's Manual (2)<BR>Updated: 2019-10-10<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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sched_setparam, sched_getparam - set and get scheduling parameters
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/sched.h">sched.h</A>></B>
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<B>int sched_setparam(pid_t </B><I>pid</I><B>, const struct sched_param *</B><I>param</I><B>);</B>
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<B>int sched_getparam(pid_t </B><I>pid</I><B>, struct sched_param *</B><I>param</I><B>);</B>
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<B>struct sched_param {
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...
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int </B><I>sched_priority</I><B>;
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...
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};
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</B></PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>sched_setparam</B>()
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sets the scheduling parameters associated with the scheduling policy
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for the thread whose thread ID is specified in <I>pid</I>.
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If <I>pid</I> is zero, then
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the parameters of the calling thread are set.
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The interpretation of
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the argument <I>param</I> depends on the scheduling
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policy of the thread identified by
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<I>pid</I>.
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See
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<B><A HREF="/cgi-bin/man/man2html?7+sched">sched</A></B>(7)
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for a description of the scheduling policies supported under Linux.
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<P>
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<B>sched_getparam</B>()
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retrieves the scheduling parameters for the
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thread identified by <I>pid</I>.
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If <I>pid</I> is zero, then the parameters
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of the calling thread are retrieved.
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<P>
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<B>sched_setparam</B>()
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checks the validity of <I>param</I> for the scheduling policy of the
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thread.
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The value <I>param->sched_priority</I> must lie within the
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range given by
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<B><A HREF="/cgi-bin/man/man2html?2+sched_get_priority_min">sched_get_priority_min</A></B>(2)
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and
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<B><A HREF="/cgi-bin/man/man2html?2+sched_get_priority_max">sched_get_priority_max</A></B>(2).
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<P>
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For a discussion of the privileges and resource limits related to
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scheduling priority and policy, see
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<B><A HREF="/cgi-bin/man/man2html?7+sched">sched</A></B>(7).
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<P>
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POSIX systems on which
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<B>sched_setparam</B>()
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and
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<B>sched_getparam</B>()
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are available define
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<B>_POSIX_PRIORITY_SCHEDULING</B>
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in <I><<A HREF="file:///usr/include/unistd.h">unistd.h</A>></I>.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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On success,
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<B>sched_setparam</B>()
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and
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<B>sched_getparam</B>()
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return 0.
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On error, -1 is returned, and
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<I>errno</I>
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is set appropriately.
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<A NAME="lbAF"> </A>
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<H2>ERRORS</H2>
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<DL COMPACT>
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<DT id="1"><B>EINVAL</B>
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<DD>
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Invalid arguments:
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<I>param</I>
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is NULL or
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<I>pid</I>
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is negative
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<DT id="2"><B>EINVAL</B>
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<DD>
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(<B>sched_setparam</B>())
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The argument <I>param</I> does not make sense for the current
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scheduling policy.
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<DT id="3"><B>EPERM</B>
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<DD>
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(<B>sched_setparam</B>())
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The caller does not have appropriate privileges
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(Linux: does not have the
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<B>CAP_SYS_NICE</B>
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capability).
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<DT id="4"><B>ESRCH</B>
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<DD>
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The thread whose ID is <I>pid</I> could not be found.
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</DL>
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<A NAME="lbAG"> </A>
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<H2>CONFORMING TO</H2>
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POSIX.1-2001, POSIX.1-2008.
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<A NAME="lbAH"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?2+getpriority">getpriority</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+gettid">gettid</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+nice">nice</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+sched_get_priority_max">sched_get_priority_max</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+sched_get_priority_min">sched_get_priority_min</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+sched_getaffinity">sched_getaffinity</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+sched_getscheduler">sched_getscheduler</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+sched_setaffinity">sched_setaffinity</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+sched_setattr">sched_setattr</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+sched_setscheduler">sched_setscheduler</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+setpriority">setpriority</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?7+capabilities">capabilities</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+sched">sched</A></B>(7)
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<A NAME="lbAI"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="5"><A HREF="#lbAB">NAME</A><DD>
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<DT id="6"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="7"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="8"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="9"><A HREF="#lbAF">ERRORS</A><DD>
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<DT id="10"><A HREF="#lbAG">CONFORMING TO</A><DD>
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<DT id="11"><A HREF="#lbAH">SEE ALSO</A><DD>
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<DT id="12"><A HREF="#lbAI">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:34 GMT, March 31, 2021
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