Rev 29 |
Blame |
Compare with Previous |
Last modification |
View Log
| RSS feed
/*
* Project: S.Ha.R.K.
*
* Coordinators:
* Giorgio Buttazzo <giorgio@sssup.it>
* Paolo Gai <pj@gandalf.sssup.it>
*
* Authors :
* Paolo Gai <pj@gandalf.sssup.it>
* Massimiliano Giorgi <massy@gandalf.sssup.it>
* Luca Abeni <luca@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: var.h,v 1.2 2002-11-11 08:36:01 pj Exp $
File: $File$
Revision: $Revision: 1.2 $
Last update: $Date: 2002-11-11 08:36:01 $
------------
Kernel global variables
**/
/*
* 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
*
*/
#ifndef __KERNEL_VAR_H__
#define __KERNEL_VAR_H__
#include <ll/ll.h>
#include <sys/types.h>
#include <kernel/descr.h>
/*---------------------------------------------------------------------*/
/* Kernel global variables: system queues & clock counters ... */
/*---------------------------------------------------------------------*/
extern proc_des proc_table[]; /*+ Process descriptor table +*/
extern level_des *level_table[]; /*+ Level descriptor table +*/
extern resource_des *resource_table[]; /*+ Resource descriptor table +*/
extern PID exec; /*+ task suggested by the scheduler +*/
extern PID exec_shadow; /*+ task really executed +*/
extern IQUEUE freedesc; /*+ Free descriptor handled as a queue +*/
extern TIME sys_tick; /*+ System tick (in usec) +*/
extern struct timespec schedule_time;
/*+ Time at witch the last scheduler()
was called +*/
extern int cap_timer; /*+ the capacity event posted when the
task starts +*/
extern struct timespec cap_lasttime;
/*+ the time at whitch the capacity
event is posted. Normally, it is
equal to schedule_time +*/
extern DWORD sched_levels; /*+ Schedule levels active in the system +*/
extern DWORD res_levels; /*+ Resource levels active in the system +*/
extern int task_counter; /*+ Application task counter. It represent
the number of Application tasks in the
system. When all Application Tasks end,
also the system ends. +*/
extern int system_counter; /*+ System task counter. It represent
the number of System tasks in the
system with the NO_KILL flag reset.
When all Application Tasks end,
the system waits for the end of the
system tasks and then it ends. +*/
extern int mustexit; /*+ This variable is set by the system
call sys_end() or sys_abort().
When a sys_end() or sys_abort is called
into an event handler,
we don't have to change context in the
reschedule(). +*/
int calling_runlevel_func; /*+ this variable is set to 1 into
call_runlevel_func (look at init.c)
ad it is used because the task_activate
(look at activate.c) must work in a
different way when the system is in the
global_context +*/
#endif /* __VAR_H__ */