WebSVN - shark - Blame - Rev 38 - /shark/trunk/include/kernel/var.h

Rev	Author	Line No.	Line
2	pj	1	/*
		2	* Project: S.Ha.R.K.
		3	*
		4	* Coordinators:
		5	* Giorgio Buttazzo <giorgio@sssup.it>
		6	* Paolo Gai <pj@gandalf.sssup.it>
		7	*
		8	* Authors :
		9	* Paolo Gai <pj@gandalf.sssup.it>
		10	* Massimiliano Giorgi <massy@gandalf.sssup.it>
		11	* Luca Abeni <luca@gandalf.sssup.it>
		12	* (see the web pages for full authors list)
		13	*
		14	* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
		15	*
		16	* http://www.sssup.it
		17	* http://retis.sssup.it
		18	* http://shark.sssup.it
		19	*/
		20
		21
		22	/**
		23	------------
38	pj	24	CVS : $Id: var.h,v 1.3 2003-01-07 17:12:19 pj Exp $
2	pj	25
		26	File: $File$
38	pj	27	Revision: $Revision: 1.3 $
		28	Last update: $Date: 2003-01-07 17:12:19 $
2	pj	29	------------
		30
		31	Kernel global variables
		32
		33	**/
		34
		35	/*
		36	* Copyright (C) 2000 Paolo Gai
		37	*
		38	* This program is free software; you can redistribute it and/or modify
		39	* it under the terms of the GNU General Public License as published by
		40	* the Free Software Foundation; either version 2 of the License, or
		41	* (at your option) any later version.
		42	*
		43	* This program is distributed in the hope that it will be useful,
		44	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		45	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		46	* GNU General Public License for more details.
		47	*
		48	* You should have received a copy of the GNU General Public License
		49	* along with this program; if not, write to the Free Software
		50	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		51	*
		52	*/
		53
		54	#ifndef __KERNEL_VAR_H__
		55	#define __KERNEL_VAR_H__
		56
		57	#include <ll/ll.h>
		58	#include <sys/types.h>
		59	#include <kernel/descr.h>
		60
		61	/---------------------------------------------------------------------/
		62	/* Kernel global variables: system queues & clock counters ... */
		63	/---------------------------------------------------------------------/
		64
		65	extern proc_des proc_table[]; /+ Process descriptor table +/
38	pj	66
2	pj	67	extern level_des level_table[]; /+ Level descriptor table +*/
38	pj	68	/* for a description of the following fields, look in kernel/kern.c */
		69	extern size_t level_size[];
		70	extern int level_used[];
		71	extern int level_first;
		72	extern int level_last;
		73	extern int level_free;
		74	extern int level_next[];
		75	extern int level_prev[];
		76
2	pj	77	extern resource_des resource_table[]; /+ Resource descriptor table +*/
		78
		79
		80	extern PID exec; /+ task suggested by the scheduler +/
		81	extern PID exec_shadow; /+ task really executed +/
		82
29	pj	83	extern IQUEUE freedesc; /+ Free descriptor handled as a queue +/
2	pj	84
		85	extern TIME sys_tick; /+ System tick (in usec) +/
		86	extern struct timespec schedule_time;
		87	/*+ Time at witch the last scheduler()
		88	was called +*/
		89
		90	extern int cap_timer; /*+ the capacity event posted when the
		91	task starts +*/
		92	extern struct timespec cap_lasttime;
		93	/*+ the time at whitch the capacity
		94	event is posted. Normally, it is
		95	equal to schedule_time +*/
		96
		97	extern DWORD res_levels; /+ Resource levels active in the system +/
		98
		99	extern int task_counter; /*+ Application task counter. It represent
		100	the number of Application tasks in the
		101	system. When all Application Tasks end,
		102	also the system ends. +*/
		103
		104	extern int system_counter; /*+ System task counter. It represent
		105	the number of System tasks in the
		106	system with the NO_KILL flag reset.
		107	When all Application Tasks end,
		108	the system waits for the end of the
		109	system tasks and then it ends. +*/
		110
		111
		112	extern int mustexit; /*+ This variable is set by the system
		113	call sys_end() or sys_abort().
		114	When a sys_end() or sys_abort is called
		115	into an event handler,
		116	we don't have to change context in the
		117	reschedule(). +*/
		118
		119	int calling_runlevel_func; /*+ this variable is set to 1 into
		120	call_runlevel_func (look at init.c)
		121	ad it is used because the task_activate
		122	(look at activate.c) must work in a
		123	different way when the system is in the
		124	global_context +*/
		125
		126	#endif /* __VAR_H__ */

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