<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=utf-8"> <TITLE>PTHREAD_SETSCHEDPARAM(3) manual page</TITLE> <META NAME="GENERATOR" CONTENT="OpenOffice.org 2.4 (Linux)"> <META NAME="CREATED" CONTENT="20050504;18110100"> <META NAME="CHANGEDBY" CONTENT="Ross Johnson"> <META NAME="CHANGED" CONTENT="20080630;22330400"> <!-- manual page source format generated by PolyglotMan v3.2, --> <!-- available at http://polyglotman.sourceforge.net/ --> </HEAD> <BODY LANG="en-GB" BGCOLOR="#ffffff" DIR="LTR"> <H4>POSIX Threads for Windows – REFERENCE - <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A></H4> <P><A HREF="index.html">Reference Index</A></P> <P><A HREF="#toc">Table of Contents</A></P> <H2><A HREF="#toc0" NAME="sect0">Name</A></H2> <P>pthread_setschedparam, pthread_getschedparam - control thread scheduling </P> <P>parameters </P> <H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2> <P><B>#include <pthread.h></B> </P> <P><B>int pthread_setschedparam(pthread_t </B><I>target_thread</I><B>, int </B><I>policy</I><B>, const struct sched_param *</B><I>param</I><B>);</B> </P> <P><B>int pthread_getschedparam(pthread_t </B><I>target_thread</I><B>, int *</B><I>policy</I><B>, struct sched_param *</B><I>param</I><B>);</B> </P> <H2><A HREF="#toc2" NAME="sect2">Description</A></H2> <P><B>pthread_setschedparam</B> sets the scheduling parameters for the thread <I>target_thread</I> as indicated by <I>policy</I> and <I>param</I>. <I>policy</I> can be either <B>SCHED_OTHER</B> (regular, non-real-time scheduling), <B>SCHED_RR</B> (real-time, round-robin) or <B>SCHED_FIFO</B> (real-time, first-in first-out). <I>param</I> specifies the scheduling priority for the two real-time policies.</P> <P><B>Pthreads-w32</B> only supports SCHED_OTHER and does not support the real-time scheduling policies <B>SCHED_RR</B> and <B>SCHED_FIFO.</B> </P> <P><B>pthread_getschedparam</B> retrieves the scheduling policy and scheduling parameters for the thread <I>target_thread</I> and stores them in the locations pointed to by <I>policy</I> and <I>param</I>, respectively. </P> <H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2> <P><B>pthread_setschedparam</B> and <B>pthread_getschedparam</B> return 0 on success and a non-zero error code on error. </P> <H2><A HREF="#toc4" NAME="sect4">Errors</A></H2> <P>On error, <B>pthread_setschedparam</B> returns the following error codes: </P> <DL> <DL> <DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>ENOTSUP</B> </DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm"> <I>policy</I> is not <B>SCHED_OTHER.</B></DD><DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"> <B>EINVAL</B> </DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm"> One of the arguments is invalid, or the priority value specified by <I>param</I> is not valid for the specified policy.</DD><DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"> <B>ESRCH</B> </DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm"> The <I>target_thread</I> is invalid or has already terminated </DD></DL> </DL> <P> On error, <B>pthread_getschedparam</B> returns the following error codes: </P> <DL> <DL> <DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>ESRCH</B> </DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm"> the <I>target_thread</I> is invalid or has already terminated </DD></DL> </DL> <H2> <A HREF="#toc5" NAME="sect5">Author</A></H2> <P>Xavier Leroy <Xavier.Leroy@inria.fr> </P> <P>Modified by Ross Johnson for use with <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A>.</P> <H2><A HREF="#toc6" NAME="sect6">See Also</A></H2> <P><A HREF="sched_setscheduler.html"><B>sched_setscheduler</B>(2)</A> , <A HREF="sched_getscheduler.html"><B>sched_getscheduler</B>(2)</A> , <A HREF="sched_getparam.html"><B>sched_getparam</B>(2)</A> , <A HREF="pthread_attr_init.html"><B>pthread_attr_setschedpolicy</B>(3)</A> , <A HREF="pthread_attr_init.html"><B>pthread_attr_setschedparam</B>(3)</A> . </P> <HR> <P><A NAME="toc"></A><B>Table of Contents</B></P> <UL> <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect0" NAME="toc0">Name</A> </P> <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect1" NAME="toc1">Synopsis</A> </P> <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect2" NAME="toc2">Description</A> </P> <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect3" NAME="toc3">Return Value</A> </P> <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect4" NAME="toc4">Errors</A> </P> <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect5" NAME="toc5">Author</A> </P> <LI><P><A HREF="#sect6" NAME="toc6">See Also</A> </P> </UL> </BODY> </HTML>