WebSVN - shark - Blame - Rev 502 - /shark/branches/xen/kernel/activate.c

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	* (see the web pages for full authors list)
		11	*
		12	* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
		13	*
		14	* http://www.sssup.it
		15	* http://retis.sssup.it
		16	* http://shark.sssup.it
		17	*/
		18
		19	/**
		20	------------
502	giacomo	21	CVS : $Id: activate.c,v 1.7 2004-03-10 14:51:42 giacomo Exp $
2	pj	22
		23	File: $File$
502	giacomo	24	Revision: $Revision: 1.7 $
		25	Last update: $Date: 2004-03-10 14:51:42 $
2	pj	26	------------
		27
		28	task_activate & group_activate
		29
		30	**/
		31
		32	/*
		33	* Copyright (C) 2000 Paolo Gai
		34	*
		35	* This program is free software; you can redistribute it and/or modify
		36	* it under the terms of the GNU General Public License as published by
		37	* the Free Software Foundation; either version 2 of the License, or
		38	* (at your option) any later version.
		39	*
		40	* This program is distributed in the hope that it will be useful,
		41	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		42	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		43	* GNU General Public License for more details.
		44	*
		45	* You should have received a copy of the GNU General Public License
		46	* along with this program; if not, write to the Free Software
		47	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		48	*
		49	*/
		50
		51	#include <stdarg.h>
		52	#include <ll/ll.h>
		53	#include <ll/stdlib.h>
		54	#include <ll/stdio.h>
		55	#include <ll/string.h>
		56	#include <kernel/config.h>
		57	#include <kernel/model.h>
		58	#include <kernel/const.h>
		59	#include <sys/types.h>
		60	#include <kernel/types.h>
		61	#include <kernel/descr.h>
		62	#include <errno.h>
		63	#include <kernel/var.h>
		64	#include <kernel/func.h>
353	giacomo	65	#include <tracer.h>
2	pj	66
		67	/*+
		68	Activates a single task
		69	+*/
		70	int task_activate(PID p)
		71	{
		72	LEVEL l; /* the level of the task p */
		73
		74	/* some controls on the task p */
		75	if (p<0 \|\| p>=MAX_PROC) {
14	pj	76	errno = EINVALID_TASK_ID;
2	pj	77	return -1;
		78	}
		79	if (proc_table[p].status == FREE) {
14	pj	80	errno = EINVALID_TASK_ID;
2	pj	81	return -1;
		82	}
		83
		84	/*+ if we are calling the runlevel functions the system is
		85	into the global_context... we only have to call
		86	the task_activate of the level +*/
		87	if (calling_runlevel_func) {
		88	SYS_FLAGS f;
		89	f=kern_fsave();
		90	if (proc_table[p].control & FREEZE_ACTIVATION)
		91	proc_table[p].frozen_activations++;
		92	else {
		93	l = proc_table[p].task_level;
38	pj	94	level_table[l]->public_activate(l,p);
2	pj	95	}
		96	kern_frestore(f);
		97	return 0;
		98	}
		99
		100
		101	/* Begin activate */
		102	if (ll_ActiveInt()) {
		103	SYS_FLAGS f;
		104	f = kern_fsave();
		105	if (proc_table[p].control & FREEZE_ACTIVATION)
		106	proc_table[p].frozen_activations++;
		107	else {
		108	l = proc_table[p].task_level;
38	pj	109	level_table[l]->public_activate(l,p);
2	pj	110	event_need_reschedule();
		111	}
		112	kern_frestore(f);
		113	}
		114	else {
		115	proc_table[exec_shadow].context = kern_context_save();
		116
		117	if (proc_table[p].control & FREEZE_ACTIVATION)
		118	proc_table[p].frozen_activations++;
		119	else {
		120	/* tracer stuff */
502	giacomo	121	TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[p].context,0);
2	pj	122	l = proc_table[p].task_level;
38	pj	123	level_table[l]->public_activate(l,p);
2	pj	124
		125	/* Preempt if necessary */
		126	scheduler();
		127	}
		128	kern_context_load(proc_table[exec_shadow].context);
		129	}
		130
		131	return 0;
		132	}
		133
		134
		135	/*+
		136	Activate a group of tasks, identified by the group g
		137	It returns -1 if the group is not valid
		138	+*/
		139	int group_activate(WORD g)
		140	{
		141	PID i; /* a counter */
		142	register LEVEL l; /* a level value */
		143
		144	if (g == 0) {
14	pj	145	errno = EINVALID_GROUP;
2	pj	146	return -1;
		147	}
		148
		149	/*+ if we are calling the runlevel functions the system is
		150	into the global_context... we only have to call
		151	the task_activate of the level +*/
		152	if (calling_runlevel_func) {
		153	SYS_FLAGS f;
		154	f=kern_fsave();
		155
		156	for (i=0 ; i<MAX_PROC; i++)
		157	if (proc_table[i].group == g) {
		158	if (proc_table[i].control & FREEZE_ACTIVATION) {
		159	proc_table[i].frozen_activations++;
		160	continue;
		161	}
		162	/* tracer stuff */
502	giacomo	163	TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[i].context,0);
2	pj	164	l = proc_table[i].task_level;
38	pj	165	level_table[l]->public_activate(l,i);
2	pj	166	}
		167
		168	kern_frestore(f);
		169	return 0;
		170	}
		171
		172	if (ll_ActiveInt()) {
		173	SYS_FLAGS f;
		174	f=kern_fsave();
		175	for (i=0 ; i<MAX_PROC; i++)
		176	if (proc_table[i].group == g) {
		177	if (proc_table[i].control & FREEZE_ACTIVATION) {
		178	proc_table[i].frozen_activations++;
		179	continue;
		180	}
		181	/* tracer stuff */
502	giacomo	182	TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[i].context,0);
2	pj	183	l = proc_table[i].task_level;
38	pj	184	level_table[l]->public_activate(l,i);
318	giacomo	185	event_need_reschedule();
2	pj	186	}
		187	kern_frestore(f);
		188	}
		189	else {
		190	proc_table[exec_shadow].context = kern_context_save();
318	giacomo	191
2	pj	192	for (i=0 ; i<MAX_PROC; i++)
		193	if (proc_table[i].group == g) {
		194	if (proc_table[i].control & FREEZE_ACTIVATION) {
		195	proc_table[i].frozen_activations++;
		196	continue;
		197	}
		198	l = proc_table[i].task_level;
38	pj	199	level_table[l]->public_activate(l,i);
2	pj	200	/* tracer stuff */
502	giacomo	201	TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[i].context,0);
2	pj	202	}
		203
		204	scheduler();
		205	kern_context_load(proc_table[exec_shadow].context);
		206	}
		207	return 0;
		208	}

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