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2 pj 1
/*
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 * Project: S.Ha.R.K.
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 *
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 * Coordinators:
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 *   Giorgio Buttazzo    <giorgio@sssup.it>
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *
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 * Authors     :
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *   (see the web pages for full authors list)
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 *
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 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
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 *
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 * http://www.sssup.it
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 * http://retis.sssup.it
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 * http://shark.sssup.it
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 */
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/**
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 ------------
1045 tullio 21
 CVS :        $Id: activate.c,v 1.11 2006-06-27 08:56:57 tullio Exp $
2 pj 22
 
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 File:        $File$
1045 tullio 24
 Revision:    $Revision: 1.11 $
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 Last update: $Date: 2006-06-27 08:56:57 $
2 pj 26
 ------------
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 task_activate & group_activate
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**/
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/*
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 * Copyright (C) 2000 Paolo Gai
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 */
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#include <stdarg.h>
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#include <ll/ll.h>
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#include <ll/stdlib.h>
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#include <ll/stdio.h>
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#include <ll/string.h>
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#include <kernel/config.h>
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#include <kernel/model.h>
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#include <kernel/const.h>
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#include <sys/types.h>
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#include <kernel/types.h>
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#include <kernel/descr.h>
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#include <errno.h>
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#include <kernel/var.h>
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#include <kernel/func.h>
353 giacomo 65
#include <tracer.h>
2 pj 66
 
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/*+
690 anton 68
  Activates a single task now
2 pj 69
+*/
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int task_activate(PID p)
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{
690 anton 72
  struct timespec t;
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  kern_gettime(&t);
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  return task_activate_at(p, &t);
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}
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/*+
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  Activates a single task at time t
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+*/
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int task_activate_at(PID p, struct timespec *t)
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{
2 pj 82
    LEVEL l;  /* the level of the task p */
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84
    /* some controls on the task p */
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    if (p<0 || p>=MAX_PROC) {
14 pj 86
        errno = EINVALID_TASK_ID;
2 pj 87
        return -1;
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    }
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    if (proc_table[p].status == FREE) {
14 pj 90
        errno = EINVALID_TASK_ID;
2 pj 91
        return -1;
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    }
93
 
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    /*+ if we are calling the runlevel functions the system is
95
        into the global_context... we only have to call
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        the task_activate of the level +*/
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    if (calling_runlevel_func) {
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        SYS_FLAGS f;
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        f=kern_fsave();
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        if (proc_table[p].control & FREEZE_ACTIVATION)
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          proc_table[p].frozen_activations++;
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        else {
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          l = proc_table[p].task_level;
690 anton 104
          level_table[l]->public_activate(l,p,t);
2 pj 105
        }
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        kern_frestore(f);
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        return 0;
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    }
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110
 
111
    /* Begin activate */
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    if (ll_ActiveInt()) {
113
      SYS_FLAGS f;
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      f = kern_fsave();
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      if (proc_table[p].control & FREEZE_ACTIVATION)
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        proc_table[p].frozen_activations++;
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      else {
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        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();
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      }
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      kern_frestore(f);
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    }
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    else {
126
      proc_table[exec_shadow].context = kern_context_save();
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128
      if (proc_table[p].control & FREEZE_ACTIVATION)
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        proc_table[p].frozen_activations++;
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      else {
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        /* 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
 
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        /* Preempt if necessary */
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        scheduler();
138
      }
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      kern_context_load(proc_table[exec_shadow].context);
140
    }
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142
    return 0;
143
}
144
 
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/*+
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
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+*/
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int group_activate_at(WORD g, struct timespec *t)
162
{
1045 tullio 163
  PID i;              /* a counter */
164
  register LEVEL l;   /* a level value */
2 pj 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) {
1045 tullio 175
    SYS_FLAGS f;
176
    f = kern_fsave();
2 pj 177
 
1045 tullio 178
    for (i = 0; i < MAX_PROC; i++) {
179
      if (proc_table[i].status != FREE) {
2 pj 180
        if (proc_table[i].group == g) {
181
          if (proc_table[i].control & FREEZE_ACTIVATION) {
182
            proc_table[i].frozen_activations++;
183
            continue;
184
          }
185
          /* tracer stuff */
1045 tullio 186
          TRACER_LOGEVENT(FTrace_EVT_task_activate, (unsigned short int)proc_table[i].context, 0);        
2 pj 187
          l = proc_table[i].task_level;
690 anton 188
          level_table[l]->public_activate(l,i,t);
2 pj 189
        }
1045 tullio 190
      }
191
    }
2 pj 192
 
1045 tullio 193
    kern_frestore(f);
194
    return 0;
2 pj 195
  }
196
 
197
  if (ll_ActiveInt()) {
198
    SYS_FLAGS f;
1045 tullio 199
    f = kern_fsave();
200
    for (i = 0; i < MAX_PROC; i++) {
201
      if (proc_table[i].status != FREE) {
202
        if (proc_table[i].group == g) {
203
          if (proc_table[i].control & FREEZE_ACTIVATION) {
204
            proc_table[i].frozen_activations++;
205
            continue;
206
          }
207
          /* tracer stuff */
208
          TRACER_LOGEVENT(FTrace_EVT_task_activate, (unsigned short int)proc_table[i].context, 0);        
209
          l = proc_table[i].task_level;
210
          level_table[l]->public_activate(l,i,t);
211
          event_need_reschedule();
2 pj 212
        }
213
      }
1045 tullio 214
    }
2 pj 215
    kern_frestore(f);
216
  }
217
  else {
218
    proc_table[exec_shadow].context = kern_context_save();
318 giacomo 219
 
1045 tullio 220
    for (i = 0 ; i < MAX_PROC; i++) {
221
      if (proc_table[i].status != FREE) {
222
        if (proc_table[i].group == g) {
223
          if (proc_table[i].control & FREEZE_ACTIVATION) {
224
            proc_table[i].frozen_activations++;
225
            continue;
226
          }
227
          l = proc_table[i].task_level;
228
          level_table[l]->public_activate(l,i,t);
229
          /* tracer stuff */
230
          TRACER_LOGEVENT(FTrace_EVT_task_activate,(unsigned short int)proc_table[i].context,0);
2 pj 231
        }
232
      }
1045 tullio 233
    }
2 pj 234
 
235
    scheduler();
236
    kern_context_load(proc_table[exec_shadow].context);
237
  }
238
  return 0;
239
}