mirror of https://github.com/PCSX2/pcsx2.git
182 lines
7.4 KiB
HTML
182 lines
7.4 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
||
<HTML>
|
||
<HEAD>
|
||
<META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=utf-8">
|
||
<TITLE>"SCHED_SETSCHEDULER"(P) manual page</TITLE>
|
||
<META NAME="GENERATOR" CONTENT="OpenOffice.org 1.1.3 (Linux)">
|
||
<META NAME="CREATED" CONTENT="20050505;13012200">
|
||
<META NAME="CHANGED" CONTENT="20050505;13193700">
|
||
<!-- 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>sched_setscheduler - set scheduling policy and parameters
|
||
(<B>REALTIME</B>)
|
||
</P>
|
||
<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2>
|
||
<P><B>#include <sched.h> </B>
|
||
</P>
|
||
<P><B>int sched_setscheduler(pid_t</B> <I>pid</I><B>, int</B> <I>policy</I><B>,
|
||
const struct sched_param *</B><I>param</I><B>); </B>
|
||
</P>
|
||
<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
|
||
<P>The <B>sched_setscheduler</B> function shall set the scheduling
|
||
policy and scheduling parameters of the process specified by <I>pid</I>
|
||
to <I>policy</I> and the parameters specified in the <B>sched_param</B>
|
||
structure pointed to by <I>param</I>, respectively. The value of the
|
||
<I>sched_priority</I> member in the <B>sched_param</B> structure
|
||
shall be any integer within the inclusive priority range for the
|
||
scheduling policy specified by <I>policy</I>. If the value of <I>pid</I>
|
||
is negative, the behavior of the <B>sched_setscheduler</B> function
|
||
is unspecified.
|
||
</P>
|
||
<P>The possible values for the <I>policy</I> parameter are defined in
|
||
the <I><sched.h></I> header.
|
||
</P>
|
||
<P><B>Pthreads-w32</B> only supports the <B>SCHED_OTHER</B> policy.
|
||
Any other value for <I>policy</I> will return failure with errno set
|
||
to <B>ENOSYS</B>. However, checks on <I>pid</I> and permissions are
|
||
performed first so that the other useful side effects of this routine
|
||
are retained.</P>
|
||
<P>If a process specified by <I>pid</I> exists, and if the calling
|
||
process has permission, the scheduling policy and scheduling
|
||
parameters shall be set for the process whose process ID is equal to
|
||
<I>pid</I>.
|
||
</P>
|
||
<P>If <I>pid</I> is zero, the scheduling policy and scheduling
|
||
parameters shall be set for the calling process.
|
||
</P>
|
||
<P>Implementations may require that the requesting process have
|
||
permission to set its own scheduling parameters or those of another
|
||
process. Additionally, implementation-defined restrictions may apply
|
||
as to the appropriate privileges required to set a process’ own
|
||
scheduling policy, or another process’ scheduling policy, to a
|
||
particular value.
|
||
</P>
|
||
<P>The <B>sched_setscheduler</B> function shall be considered
|
||
successful if it succeeds in setting the scheduling policy and
|
||
scheduling parameters of the process specified by <I>pid</I> to the
|
||
values specified by <I>policy</I> and the structure pointed to by
|
||
<I>param</I>, respectively.
|
||
</P>
|
||
<P>The effect of this function on individual threads is dependent on
|
||
the scheduling contention scope of the threads:
|
||
</P>
|
||
<DL>
|
||
<DT>*
|
||
</DT><DD STYLE="margin-bottom: 0.5cm">
|
||
For threads with system scheduling contention scope, these functions
|
||
shall have no effect on their scheduling.
|
||
</DD><DT>
|
||
*
|
||
</DT><DD STYLE="margin-bottom: 0.5cm">
|
||
For threads with process scheduling contention scope, the threads’
|
||
scheduling policy and associated parameters shall not be affected.
|
||
However, the scheduling of these threads with respect to threads in
|
||
other processes may be dependent on the scheduling parameters of
|
||
their process, which are governed using these functions.
|
||
</DD></DL>
|
||
<P>
|
||
This function is not atomic with respect to other threads in the
|
||
process. Threads may continue to execute while this function call is
|
||
in the process of changing the scheduling policy and associated
|
||
scheduling parameters for the underlying kernel-scheduled entities
|
||
used by the process contention scope threads.
|
||
</P>
|
||
<H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2>
|
||
<P>Upon successful completion, the function shall return the former
|
||
scheduling policy of the specified process. If the <B>sched_setscheduler</B>
|
||
function fails to complete successfully, the policy and scheduling
|
||
parameters shall remain unchanged, and the function shall return a
|
||
value of -1 and set <I>errno</I> to indicate the error.
|
||
</P>
|
||
<H2><A HREF="#toc4" NAME="sect4">Errors</A></H2>
|
||
<P>The <B>sched_setscheduler</B> function shall fail if:
|
||
</P>
|
||
<DL>
|
||
<DT><B>EINVAL</B>
|
||
</DT><DD>
|
||
The value of the <I>policy</I> parameter is invalid, or one or more
|
||
of the parameters contained in <I>param</I> is outside the valid
|
||
range for the specified scheduling policy.
|
||
</DD><DT>
|
||
<B>EPERM</B>
|
||
</DT><DD>
|
||
The requesting process does not have permission to set either or
|
||
both of the scheduling parameters or the scheduling policy of the
|
||
specified process.
|
||
</DD><DT>
|
||
<B>ESRCH</B>
|
||
</DT><DD STYLE="margin-bottom: 0.5cm">
|
||
No process can be found corresponding to that specified by <I>pid</I>.
|
||
</DD></DL>
|
||
<P>
|
||
<I>The following sections are informative.</I>
|
||
</P>
|
||
<H2><A HREF="#toc5" NAME="sect5">Examples</A></H2>
|
||
<P>None.
|
||
</P>
|
||
<H2><A HREF="#toc6" NAME="sect6">Application Usage</A></H2>
|
||
<P>None.
|
||
</P>
|
||
<H2><A HREF="#toc7" NAME="sect7">Rationale</A></H2>
|
||
<P>None.
|
||
</P>
|
||
<H2><A HREF="#toc8" NAME="sect8">Future Directions</A></H2>
|
||
<P>None.
|
||
</P>
|
||
<H2><A HREF="#toc9" NAME="sect9">See Also</A></H2>
|
||
<P><A HREF="sched_getscheduler.html"><B>sched_getscheduler</B>(3)</A>
|
||
<B>,</B> the Base Definitions volume of IEEE Std 1003.1-2001,
|
||
<I><sched.h></I>
|
||
</P>
|
||
<H2><A HREF="#toc10" NAME="sect10">Copyright</A></H2>
|
||
<P>Portions of this text are reprinted and reproduced in electronic
|
||
form from IEEE Std 1003.1, 2003 Edition, Standard for Information
|
||
Technology -- Portable Operating System Interface (POSIX), The Open
|
||
Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the
|
||
Institute of Electrical and Electronics Engineers, Inc and The Open
|
||
Group. In the event of any discrepancy between this version and the
|
||
original IEEE and The Open Group Standard, the original IEEE and The
|
||
Open Group Standard is the referee document. The original Standard
|
||
can be obtained online at <A HREF="http://www.opengroup.org/unix/online.html">http://www.opengroup.org/unix/online.html</A>
|
||
.
|
||
</P>
|
||
<P>Modified by Ross Johnson for use with <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</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">Examples</A>
|
||
</P>
|
||
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect6" NAME="toc6">Application
|
||
Usage</A>
|
||
</P>
|
||
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect7" NAME="toc7">Rationale</A>
|
||
</P>
|
||
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect8" NAME="toc8">Future
|
||
Directions</A>
|
||
</P>
|
||
<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect9" NAME="toc9">See
|
||
Also</A>
|
||
</P>
|
||
<LI><P><A HREF="#sect10" NAME="toc10">Copyright</A>
|
||
</P>
|
||
</UL>
|
||
</BODY>
|
||
</HTML>
|