kernel/core/spinlock.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include <system.h>
  21 #include <spinlock.h>
  22
  23 unsigned spinlock_lock (spinlock_t *spinlock)
  24 {
  25         if (spinlock->locked)
  26                 return 0;
  27
  28         spinlock->locked = 1;
  29
  30         return 1;
  31 }
  32
  33 unsigned spinlock_unlock (spinlock_t *spinlock)
  34 {
  35         if (!spinlock->locked)
  36                 return 0;
  37
  38         spinlock->locked = 0;
  39
  40         return 1;
  41 }
  42
  43 unsigned spinlock_init (spinlock_t *spinlock)
  44 {
  45         spinlock->locked = 0;
  46 }