WebSVN - shark - Blame - Rev 803 - /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	------------
803	giacomo	21	CVS : $Id: activate.c,v 1.10 2004-09-02 13:48:08 giacomo Exp $
2	pj	22
		23	File: $File$
803	giacomo	24	Revision: $Revision: 1.10 $
		25	Last update: $Date: 2004-09-02 13:48:08 $
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;
803	giacomo	119	TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[p].context,0);
690	anton	120	level_table[l]->public_activate(l,p,t);
2	pj	121	event_need_reschedule();
		122	}
		123	kern_frestore(f);
		124	}
		125	else {
		126	proc_table[exec_shadow].context = kern_context_save();
		127
		128	if (proc_table[p].control & FREEZE_ACTIVATION)
		129	proc_table[p].frozen_activations++;
		130	else {
		131	/* tracer stuff */
502	giacomo	132	TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[p].context,0);
2	pj	133	l = proc_table[p].task_level;
690	anton	134	level_table[l]->public_activate(l,p,t);
2	pj	135
		136	/* Preempt if necessary */
		137	scheduler();
		138	}
		139	kern_context_load(proc_table[exec_shadow].context);
		140	}
		141
		142	return 0;
		143	}
		144
		145
		146	/*+
690	anton	147	Activate a group of tasks identified by the group g now.
2	pj	148	It returns -1 if the group is not valid
		149	+*/
		150	int group_activate(WORD g)
		151	{
690	anton	152	struct timespec t;
		153	kern_gettime(&t);
		154	return group_activate_at(g, &t);
		155	}
		156
		157	/*+
		158	Activate a group of tasks identified by the group g at time t.
		159	It returns -1 if the group is not valid
		160	+*/
		161	int group_activate_at(WORD g, struct timespec *t)
		162	{
2	pj	163	PID i; /* a counter */
		164	register LEVEL l; /* a level value */
		165
		166	if (g == 0) {
14	pj	167	errno = EINVALID_GROUP;
2	pj	168	return -1;
		169	}
		170
		171	/*+ if we are calling the runlevel functions the system is
		172	into the global_context... we only have to call
		173	the task_activate of the level +*/
		174	if (calling_runlevel_func) {
		175	SYS_FLAGS f;
		176	f=kern_fsave();
		177
		178	for (i=0 ; i<MAX_PROC; i++)
		179	if (proc_table[i].group == g) {
		180	if (proc_table[i].control & FREEZE_ACTIVATION) {
		181	proc_table[i].frozen_activations++;
		182	continue;
		183	}
		184	/* tracer stuff */
502	giacomo	185	TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[i].context,0);
2	pj	186	l = proc_table[i].task_level;
690	anton	187	level_table[l]->public_activate(l,i,t);
2	pj	188	}
		189
		190	kern_frestore(f);
		191	return 0;
		192	}
		193
		194	if (ll_ActiveInt()) {
		195	SYS_FLAGS f;
		196	f=kern_fsave();
		197	for (i=0 ; i<MAX_PROC; i++)
		198	if (proc_table[i].group == g) {
		199	if (proc_table[i].control & FREEZE_ACTIVATION) {
		200	proc_table[i].frozen_activations++;
		201	continue;
		202	}
		203	/* tracer stuff */
502	giacomo	204	TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[i].context,0);
2	pj	205	l = proc_table[i].task_level;
690	anton	206	level_table[l]->public_activate(l,i,t);
318	giacomo	207	event_need_reschedule();
2	pj	208	}
		209	kern_frestore(f);
		210	}
		211	else {
		212	proc_table[exec_shadow].context = kern_context_save();
318	giacomo	213
2	pj	214	for (i=0 ; i<MAX_PROC; i++)
		215	if (proc_table[i].group == g) {
		216	if (proc_table[i].control & FREEZE_ACTIVATION) {
		217	proc_table[i].frozen_activations++;
		218	continue;
		219	}
		220	l = proc_table[i].task_level;
690	anton	221	level_table[l]->public_activate(l,i,t);
2	pj	222	/* tracer stuff */
502	giacomo	223	TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[i].context,0);
2	pj	224	}
		225
		226	scheduler();
		227	kern_context_load(proc_table[exec_shadow].context);
		228	}
		229	return 0;
		230	}

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