kernel/include/mutex.h

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2008  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 #ifndef _MUTEX_H
  21 #define _MUTEX_H
  22
  23 #include <task.h>
  24
  25 typedef struct mutex {
  26         volatile int locked;
  27 } mutex_t;
  28
  29 #define MUTEX_CREATE(name) mutex_t name = { .locked = 0 }
  30
  31 /* externs */
  32 extern unsigned mutex_lock (mutex_t *mutex);
  33 extern unsigned mutex_unlock (mutex_t *mutex);
  34 extern unsigned mutex_init (mutex_t *mutex);
  35
  36 #endif