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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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 *   (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: cancel.c,v 1.4 2005-01-08 14:44:06 pj Exp $
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 File:        $File$
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 Revision:    $Revision: 1.4 $
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 Last update: $Date: 2005-01-08 14:44:06 $
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 ------------
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 This file contains:
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 - the cancellation point function
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 - the setcancelstate and setcanceltype functions
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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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  This primitive creates a cancellation point in the calling task
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+*/
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void task_testcancel(void)
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{
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  SYS_FLAGS f;  // testcancel may be called from primitives, i.e. task_join
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  f = kern_fsave();
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  if (proc_table[exec_shadow].control & KILL_ENABLED &&
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      proc_table[exec_shadow].control & KILL_REQUEST ) {
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    task_makefree(TASK_CANCELED);
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    scheduler();
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    ll_context_to(proc_table[exec_shadow].context);
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  }
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  kern_frestore(f);
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}
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/*+ This primitive set the cancellation state of the task +*/
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int task_setcancelstate(int state, int *oldstate)
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{
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  SYS_FLAGS f;
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  f = kern_fsave();
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  if (state != TASK_CANCEL_ENABLE &&
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      state != TASK_CANCEL_DISABLE) {
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    kern_frestore(f);
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    return -1;
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  }
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  *oldstate = (proc_table[exec_shadow].control & KILL_ENABLED) != 0;
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  proc_table[exec_shadow].control &= ~KILL_ENABLED;
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  proc_table[exec_shadow].control |= state;
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  kern_frestore(f);
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  return 0;
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}
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/*+ This primitive set the cancellation type of the task +*/
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int task_setcanceltype(int type, int *oldtype)
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{
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  SYS_FLAGS f;
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  f = kern_fsave();
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  if (type != TASK_CANCEL_DEFERRED &&
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      type != TASK_CANCEL_ASYNCHRONOUS) {
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    kern_frestore(f);
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    return -1;
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  }
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  *oldtype = (proc_table[exec_shadow].control & KILL_DEFERRED) != 0;
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  proc_table[exec_shadow].control &= ~KILL_DEFERRED;
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  proc_table[exec_shadow].control |= type;
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  kern_frestore(f);
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  return 0;
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}