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128 lines
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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>"SCHED_GETSCHEDULER"(P) manual page</TITLE>
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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>sched_getscheduler - get scheduling policy (<B>REALTIME</B>)
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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 <sched.h> </B>
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</P>
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<P><B>int sched_getscheduler(pid_t</B> <I>pid</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>The <B>sched_getscheduler</B> function shall return the scheduling
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policy of the process specified by <I>pid</I>. If the value of <I>pid</I>
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is negative, the behavior of the <B>sched_getscheduler</B> function
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is unspecified.
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</P>
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<P>The values that can be returned by <B>sched_getscheduler</B> are
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defined in the <I><sched.h></I> header.
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</P>
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<P><B>Pthreads-w32</B> only supports the <B>SCHED_OTHER</B> policy,
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which is the only value that can be returned. However, checks on <I>pid</I>
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and permissions are performed first so that the other useful side
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effects of this routine are retained.</P>
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<P>If a process specified by <I>pid</I> exists, and if the calling
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process has permission, the scheduling policy shall be returned for
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the process whose process ID is equal to <I>pid</I>.
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</P>
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<P>If <I>pid</I> is zero, the scheduling policy shall be returned for
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the calling process.
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</P>
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<H2><A HREF="#toc3" NAME="sect3">Return Value</A></H2>
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<P>Upon successful completion, the <B>sched_getscheduler</B> function
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shall return the scheduling policy of the specified process. If
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unsuccessful, the function shall return -1 and set <I>errno</I> to
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indicate the error.
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</P>
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<H2><A HREF="#toc4" NAME="sect4">Errors</A></H2>
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<P>The <B>sched_getscheduler</B> function shall fail if:
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</P>
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<DL>
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<DT><B>EPERM</B>
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</DT><DD>
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The requesting process does not have permission to determine the
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scheduling policy of the specified process.
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</DD><DT>
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<B>ESRCH</B>
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</DT><DD STYLE="margin-bottom: 0.5cm">
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No process can be found corresponding to that specified by <I>pid</I>.
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</DD></DL>
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<P>
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<I>The following sections are informative.</I>
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</P>
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<H2><A HREF="#toc5" NAME="sect5">Examples</A></H2>
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<P>None.
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</P>
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<H2><A HREF="#toc6" NAME="sect6">Application Usage</A></H2>
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<P>None.
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</P>
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<H2><A HREF="#toc7" NAME="sect7">Rationale</A></H2>
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<P>None.
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</P>
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<H2><A HREF="#toc8" NAME="sect8">Future Directions</A></H2>
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<P>None.
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</P>
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<H2><A HREF="#toc9" NAME="sect9">See Also</A></H2>
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<P><A HREF="sched_setscheduler.html"><B>sched_setscheduler</B>(3)</A>
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, the Base Definitions volume of IEEE Std 1003.1-2001,
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<I><sched.h></I>
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</P>
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<H2><A HREF="#toc10" NAME="sect10">Copyright</A></H2>
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<P>Portions of this text are reprinted and reproduced in electronic
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form from IEEE Std 1003.1, 2003 Edition, Standard for Information
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Technology -- Portable Operating System Interface (POSIX), The Open
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Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the
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Institute of Electrical and Electronics Engineers, Inc and The Open
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Group. In the event of any discrepancy between this version and the
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original IEEE and The Open Group Standard, the original IEEE and The
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Open Group Standard is the referee document. The original Standard
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can be obtained online at <A HREF="http://www.opengroup.org/unix/online.html">http://www.opengroup.org/unix/online.html</A>
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.
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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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<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">Examples</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect6" NAME="toc6">Application
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Usage</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect7" NAME="toc7">Rationale</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect8" NAME="toc8">Future
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Directions</A>
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</P>
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<LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect9" NAME="toc9">See
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Also</A>
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</P>
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<LI><P><A HREF="#sect10" NAME="toc10">Copyright</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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