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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: activate.c,v 1.11 2006-06-27 08:56:57 tullio Exp $
File: $File$
Revision: $Revision: 1.11 $
Last update: $Date: 2006-06-27 08:56:57 $
------------
task_activate & group_activate
**/
/*
* Copyright (C) 2000 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 <arch/stdlib.h>
#include <arch/stdio.h>
#include <arch/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 <tracer.h>
/*+
Activates a single task now
+*/
int task_activate(PID p)
{
struct timespec t;
kern_gettime(&t);
return task_activate_at(p, &t);
}
/*+
Activates a single task at time t
+*/
int task_activate_at(PID p, struct timespec *t)
{
LEVEL l; /* the level of the task p */
/* some controls on the task p */
if (p<0 || p>=MAX_PROC) {
errno = EINVALID_TASK_ID;
return -1;
}
if (proc_table[p].status == FREE) {
errno = EINVALID_TASK_ID;
return -1;
}
/*+ if we are calling the runlevel functions the system is
into the global_context... we only have to call
the task_activate of the level +*/
if (calling_runlevel_func) {
SYS_FLAGS f;
f=kern_fsave();
if (proc_table[p].control & FREEZE_ACTIVATION)
proc_table[p].frozen_activations++;
else {
l = proc_table[p].task_level;
level_table[l]->public_activate(l,p,t);
}
kern_frestore(f);
return 0;
}
/* Begin activate */
if (ll_ActiveInt()) {
SYS_FLAGS f;
f = kern_fsave();
if (proc_table[p].control & FREEZE_ACTIVATION)
proc_table[p].frozen_activations++;
else {
l = proc_table[p].task_level;
TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[p].context,0);
level_table[l]->public_activate(l,p,t);
event_need_reschedule();
}
kern_frestore(f);
}
else {
proc_table[exec_shadow].context = kern_context_save();
if (proc_table[p].control & FREEZE_ACTIVATION)
proc_table[p].frozen_activations++;
else {
/* tracer stuff */
TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[p].context,0);
l = proc_table[p].task_level;
level_table[l]->public_activate(l,p,t);
/* Preempt if necessary */
scheduler();
}
kern_context_load(proc_table[exec_shadow].context);
}
return 0;
}
/*+
Activate a group of tasks identified by the group g now.
It returns -1 if the group is not valid
+*/
int group_activate(WORD g)
{
struct timespec t;
kern_gettime(&t);
return group_activate_at(g, &t);
}
/*+
Activate a group of tasks identified by the group g at time t.
It returns -1 if the group is not valid
+*/
int group_activate_at(WORD g, struct timespec *t)
{
PID i; /* a counter */
register LEVEL l; /* a level value */
if (g == 0) {
errno = EINVALID_GROUP;
return -1;
}
/*+ if we are calling the runlevel functions the system is
into the global_context... we only have to call
the task_activate of the level +*/
if (calling_runlevel_func) {
SYS_FLAGS f;
f = kern_fsave();
for (i = 0; i < MAX_PROC; i++) {
if (proc_table[i].status != FREE) {
if (proc_table[i].group == g) {
if (proc_table[i].control & FREEZE_ACTIVATION) {
proc_table[i].frozen_activations++;
continue;
}
/* tracer stuff */
TRACER_LOGEVENT(FTrace_EVT_task_activate, (unsigned short int)proc_table[i].context, 0);
l = proc_table[i].task_level;
level_table[l]->public_activate(l,i,t);
}
}
}
kern_frestore(f);
return 0;
}
if (ll_ActiveInt()) {
SYS_FLAGS f;
f = kern_fsave();
for (i = 0; i < MAX_PROC; i++) {
if (proc_table[i].status != FREE) {
if (proc_table[i].group == g) {
if (proc_table[i].control & FREEZE_ACTIVATION) {
proc_table[i].frozen_activations++;
continue;
}
/* tracer stuff */
TRACER_LOGEVENT(FTrace_EVT_task_activate, (unsigned short int)proc_table[i].context, 0);
l = proc_table[i].task_level;
level_table[l]->public_activate(l,i,t);
event_need_reschedule();
}
}
}
kern_frestore(f);
}
else {
proc_table[exec_shadow].context = kern_context_save();
for (i = 0 ; i < MAX_PROC; i++) {
if (proc_table[i].status != FREE) {
if (proc_table[i].group == g) {
if (proc_table[i].control & FREEZE_ACTIVATION) {
proc_table[i].frozen_activations++;
continue;
}
l = proc_table[i].task_level;
level_table[l]->public_activate(l,i,t);
/* tracer stuff */
TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[i].context,0);
}
}
}
scheduler();
kern_context_load(proc_table[exec_shadow].context);
}
return 0;
}