WebSVN - shark - Blame - Rev 690 - /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	------------
690	anton	21	CVS : $Id: activate.c,v 1.9 2004-05-26 15:33:46 anton Exp $
2	pj	22
		23	File: $File$
690	anton	24	Revision: $Revision: 1.9 $
		25	Last update: $Date: 2004-05-26 15:33:46 $
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	/*+
690	anton	68	Activates a single task now
2	pj	69	+*/
		70	int task_activate(PID p)
		71	{
690	anton	72	struct timespec t;
		73	kern_gettime(&t);
		74	return task_activate_at(p, &t);
		75	}
		76
		77	/*+
		78	Activates a single task at time t
		79	+*/
		80	int task_activate_at(PID p, struct timespec *t)
		81	{
2	pj	82	LEVEL l; /* the level of the task p */
		83
		84	/* some controls on the task p */
		85	if (p<0 \|\| p>=MAX_PROC) {
14	pj	86	errno = EINVALID_TASK_ID;
2	pj	87	return -1;
		88	}
		89	if (proc_table[p].status == FREE) {
14	pj	90	errno = EINVALID_TASK_ID;
2	pj	91	return -1;
		92	}
		93
		94	/*+ if we are calling the runlevel functions the system is
		95	into the global_context... we only have to call
		96	the task_activate of the level +*/
		97	if (calling_runlevel_func) {
		98	SYS_FLAGS f;
		99	f=kern_fsave();
		100	if (proc_table[p].control & FREEZE_ACTIVATION)
		101	proc_table[p].frozen_activations++;
		102	else {
		103	l = proc_table[p].task_level;
690	anton	104	level_table[l]->public_activate(l,p,t);
2	pj	105	}
		106	kern_frestore(f);
		107	return 0;
		108	}
		109
		110
		111	/* Begin activate */
		112	if (ll_ActiveInt()) {
		113	SYS_FLAGS f;
		114	f = kern_fsave();
		115	if (proc_table[p].control & FREEZE_ACTIVATION)
		116	proc_table[p].frozen_activations++;
		117	else {
		118	l = proc_table[p].task_level;
690	anton	119	level_table[l]->public_activate(l,p,t);
2	pj	120	event_need_reschedule();
		121	}
		122	kern_frestore(f);
		123	}
		124	else {
		125	proc_table[exec_shadow].context = kern_context_save();
		126
		127	if (proc_table[p].control & FREEZE_ACTIVATION)
		128	proc_table[p].frozen_activations++;
		129	else {
		130	/* tracer stuff */
502	giacomo	131	TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[p].context,0);
2	pj	132	l = proc_table[p].task_level;
690	anton	133	level_table[l]->public_activate(l,p,t);
2	pj	134
		135	/* Preempt if necessary */
		136	scheduler();
		137	}
		138	kern_context_load(proc_table[exec_shadow].context);
		139	}
		140
		141	return 0;
		142	}
		143
		144
		145	/*+
690	anton	146	Activate a group of tasks identified by the group g now.
2	pj	147	It returns -1 if the group is not valid
		148	+*/
		149	int group_activate(WORD g)
		150	{
690	anton	151	struct timespec t;
		152	kern_gettime(&t);
		153	return group_activate_at(g, &t);
		154	}
		155
		156	/*+
		157	Activate a group of tasks identified by the group g at time t.
		158	It returns -1 if the group is not valid
		159	+*/
		160	int group_activate_at(WORD g, struct timespec *t)
		161	{
2	pj	162	PID i; /* a counter */
		163	register LEVEL l; /* a level value */
		164
		165	if (g == 0) {
14	pj	166	errno = EINVALID_GROUP;
2	pj	167	return -1;
		168	}
		169
		170	/*+ if we are calling the runlevel functions the system is
		171	into the global_context... we only have to call
		172	the task_activate of the level +*/
		173	if (calling_runlevel_func) {
		174	SYS_FLAGS f;
		175	f=kern_fsave();
		176
		177	for (i=0 ; i<MAX_PROC; i++)
		178	if (proc_table[i].group == g) {
		179	if (proc_table[i].control & FREEZE_ACTIVATION) {
		180	proc_table[i].frozen_activations++;
		181	continue;
		182	}
		183	/* tracer stuff */
502	giacomo	184	TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[i].context,0);
2	pj	185	l = proc_table[i].task_level;
690	anton	186	level_table[l]->public_activate(l,i,t);
2	pj	187	}
		188
		189	kern_frestore(f);
		190	return 0;
		191	}
		192
		193	if (ll_ActiveInt()) {
		194	SYS_FLAGS f;
		195	f=kern_fsave();
		196	for (i=0 ; i<MAX_PROC; i++)
		197	if (proc_table[i].group == g) {
		198	if (proc_table[i].control & FREEZE_ACTIVATION) {
		199	proc_table[i].frozen_activations++;
		200	continue;
		201	}
		202	/* tracer stuff */
502	giacomo	203	TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[i].context,0);
2	pj	204	l = proc_table[i].task_level;
690	anton	205	level_table[l]->public_activate(l,i,t);
318	giacomo	206	event_need_reschedule();
2	pj	207	}
		208	kern_frestore(f);
		209	}
		210	else {
		211	proc_table[exec_shadow].context = kern_context_save();
318	giacomo	212
2	pj	213	for (i=0 ; i<MAX_PROC; i++)
		214	if (proc_table[i].group == g) {
		215	if (proc_table[i].control & FREEZE_ACTIVATION) {
		216	proc_table[i].frozen_activations++;
		217	continue;
		218	}
		219	l = proc_table[i].task_level;
690	anton	220	level_table[l]->public_activate(l,i,t);
2	pj	221	/* tracer stuff */
502	giacomo	222	TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[i].context,0);
2	pj	223	}
		224
		225	scheduler();
		226	kern_context_load(proc_table[exec_shadow].context);
		227	}
		228	return 0;
		229	}

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