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/*
* Project: S.Ha.R.K.
*
* Coordinators:
* Giorgio Buttazzo <giorgio@sssup.it>
* Paolo Gai <pj@gandalf.sssup.it>
*
* Authors :
* Paolo Gai <pj@gandalf.sssup.it>
* (see the web pages for full authors list)
*
* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
*
* http://www.sssup.it
* http://retis.sssup.it
* http://shark.sssup.it
*/
/**
------------
CVS : $Id: tskmsg.c,v 1.2 2003-07-22 11:56:06 giacomo Exp $
File: $File$
Revision: $Revision: 1.2 $
Last update: $Date: 2003-07-22 11:56:06 $
------------
**/
/*
* Copyright (C) 2002 Paolo Gai
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdarg.h>
#include <ll/ll.h>
#include <ll/stdlib.h>
#include <ll/stdio.h>
#include <ll/string.h>
#include <kernel/config.h>
#include <kernel/model.h>
#include <kernel/const.h>
#include <sys/types.h>
#include <kernel/types.h>
#include <kernel/descr.h>
#include <errno.h>
#include <kernel/var.h>
#include <kernel/func.h>
#include <kernel/trace.h>
/*
The running task (pointed by exec_shadow) sent a message m to the
scheduling module that handle the task p.
If the message has value NULL the behavior should be the
task_endcycle primitive behavior, and an endcycle tracer event is
generated.
*/
int task_message(void *m, PID p, int reschedule)
{
LEVEL l; /* for readableness only */
int retvalue;
if (p == NIL) p = exec_shadow;
if (reschedule) {
proc_table[exec_shadow].context = kern_context_save();
kern_epilogue_macro();
l = proc_table[p].task_level;
retvalue = level_table[l]->public_message(l,p,m);
exec = exec_shadow = -1;
scheduler();
kern_context_load(proc_table[exec_shadow].context);
} else {
SYS_FLAGS f;
f = kern_fsave();
l = proc_table[p].task_level;
retvalue = level_table[l]->public_message(l,p,m);
kern_frestore(f);
}
return retvalue;
}