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/*
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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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 *   Massimiliano Giorgi <massy@gandalf.sssup.it>
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 *   Luca Abeni          <luca@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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 ------------
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 CVS :        $Id: blkact.c,v 1.1.1.1 2002-03-29 14:12:51 pj Exp $
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 File:        $File$
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 Revision:    $Revision: 1.1.1.1 $
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 Last update: $Date: 2002-03-29 14:12:51 $
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 ------------
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 block_activations & co.
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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>
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/*+
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  It blocks all explicit activation of a task made with task_activate and
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  group_activate. These activations are registered in an internal counter,
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  returned by task_unblock_activation.
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  it returns 0 if all ok, or -1 otherwise. errno is set accordingly.
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+*/
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int task_block_activation(PID p)
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{
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    SYS_FLAGS f;
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    /* some controls on the task p */
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    if (p<0 || p>=MAX_PROC) {
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        errno = EUNVALID_TASK_ID;
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        return -1;
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    }
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    if (proc_table[p].status == FREE) {
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        errno = EUNVALID_TASK_ID;
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        return -1;
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    }
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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].control |= FREEZE_ACTIVATION;
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      proc_table[p].frozen_activations = 0;
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    }
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    kern_frestore(f);
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    return 0;
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}
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/*+
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  It unblocks all explicit activations of a task, and returns the number of
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  "frozen" activations. It not call the task_activate!!!!
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  it returns -1 if an error occurs. errno is set accordingly.
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+*/
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int task_unblock_activation(PID p)
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{
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    int result;
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    SYS_FLAGS f;
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    /* some controls on the task p */
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    if (p<0 || p>=MAX_PROC) {
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        errno = EUNVALID_TASK_ID;
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        return -1;
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    }
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    if (proc_table[p].status == FREE) {
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        errno = EUNVALID_TASK_ID;
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        return -1;
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    }
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    f = kern_fsave();
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    result = 0;
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    if (proc_table[p].control & FREEZE_ACTIVATION) {
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      proc_table[p].control &= ~FREEZE_ACTIVATION;
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      result = proc_table[p].frozen_activations;
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      proc_table[p].frozen_activations = 0;
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    }
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    kern_frestore(f);
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    return result;
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}