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114 lines
4.6 KiB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=utf-8">
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<TITLE>PTHREAD_SETSCHEDPARAM(3) manual page</TITLE>
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<META NAME="CREATED" CONTENT="20050504;18110100">
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<META NAME="CHANGEDBY" CONTENT="Ross Johnson">
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<!-- manual page source format generated by PolyglotMan v3.2, -->
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</HEAD>
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<BODY LANG="en-GB" BGCOLOR="#ffffff" DIR="LTR">
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<H4>POSIX Threads for Windows – REFERENCE - <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A></H4>
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<P><A HREF="index.html">Reference Index</A></P>
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<P><A HREF="#toc">Table of Contents</A></P>
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<H2><A HREF="#toc0" NAME="sect0">Name</A></H2>
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<P>pthread_setschedparam, pthread_getschedparam - control thread
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scheduling
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</P>
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<P>parameters
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</P>
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<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2>
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<P><B>#include <pthread.h></B>
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</P>
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<P><B>int pthread_setschedparam(pthread_t </B><I>target_thread</I><B>,
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int </B><I>policy</I><B>, const struct sched_param *</B><I>param</I><B>);</B>
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</P>
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<P><B>int pthread_getschedparam(pthread_t </B><I>target_thread</I><B>,
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int *</B><I>policy</I><B>, struct sched_param *</B><I>param</I><B>);</B>
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</P>
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<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
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<P><B>pthread_setschedparam</B> sets the scheduling parameters for
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the thread <I>target_thread</I> as indicated by <I>policy</I> and
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<I>param</I>. <I>policy</I> can be either <B>SCHED_OTHER</B>
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(regular, non-real-time scheduling), <B>SCHED_RR</B> (real-time,
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round-robin) or <B>SCHED_FIFO</B> (real-time, first-in first-out).
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<I>param</I> specifies the scheduling priority for the two real-time
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policies.</P>
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<P><B>Pthreads-w32</B> only supports SCHED_OTHER and does not support
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the real-time scheduling policies <B>SCHED_RR</B> and <B>SCHED_FIFO.</B>
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</P>
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<P><B>pthread_getschedparam</B> retrieves the scheduling policy and
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scheduling parameters for the thread <I>target_thread</I> and stores
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them in the locations pointed to by <I>policy</I> and <I>param</I>,
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respectively.
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</P>
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<H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2>
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<P><B>pthread_setschedparam</B> and <B>pthread_getschedparam</B>
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return 0 on success and a non-zero error code on error.
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</P>
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<H2><A HREF="#toc4" NAME="sect4">Errors</A></H2>
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<P>On error, <B>pthread_setschedparam</B> returns the following error
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codes:
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</P>
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<DL>
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<DL>
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<DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>ENOTSUP</B>
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</DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
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<I>policy</I> is not <B>SCHED_OTHER.</B></DD><DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
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<B>EINVAL</B>
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</DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
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One of the arguments is invalid, or the priority value specified by
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<I>param</I> is not valid for the specified policy.</DD><DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
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<B>ESRCH</B>
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</DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
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The <I>target_thread</I> is invalid or has already terminated
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</DD></DL>
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</DL>
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<P>
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On error, <B>pthread_getschedparam</B> returns the following error
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codes:
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</P>
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<DL>
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<DL>
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<DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>ESRCH</B>
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</DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm">
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the <I>target_thread</I> is invalid or has already terminated
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</DD></DL>
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</DL>
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<H2>
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<A HREF="#toc5" NAME="sect5">Author</A></H2>
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<P>Xavier Leroy <Xavier.Leroy@inria.fr>
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</P>
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<P>Modified by Ross Johnson for use with <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A>.</P>
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<H2><A HREF="#toc6" NAME="sect6">See Also</A></H2>
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<P><A HREF="sched_setscheduler.html"><B>sched_setscheduler</B>(2)</A>
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, <A HREF="sched_getscheduler.html"><B>sched_getscheduler</B>(2)</A>
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, <A HREF="sched_getparam.html"><B>sched_getparam</B>(2)</A> ,
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<A HREF="pthread_attr_init.html"><B>pthread_attr_setschedpolicy</B>(3)</A>
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, <A HREF="pthread_attr_init.html"><B>pthread_attr_setschedparam</B>(3)</A>
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.
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</P>
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<HR>
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<P><A NAME="toc"></A><B>Table of Contents</B></P>
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<UL>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect0" NAME="toc0">Name</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect1" NAME="toc1">Synopsis</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect2" NAME="toc2">Description</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect3" NAME="toc3">Return
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Value</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect4" NAME="toc4">Errors</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect5" NAME="toc5">Author</A>
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</P>
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<LI><P><A HREF="#sect6" NAME="toc6">See Also</A>
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</P>
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</UL>
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</BODY>
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</HTML>
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