include/sem.h

   1 #ifndef _SEM_H_
   2 #define _SEM_H_
   3
   4 #include <sched.h>
   5 #include <lock.h>
   6
   7 struct sem {
   8         volatile int count;
   9         struct list tasks; /* tasks waiting on semaphore */
  10         struct lock lock;
  11 };
  12
  13 #define SEM_DECLARE_INIT(sname, scount)            \
  14         struct sem sname = {                       \
  15                 .count = scount,                   \
  16                 .tasks = LIST_INIT(sname.tasks),   \
  17                 .lock = LOCK_INIT,                 \
  18         }
  19
  20 void sem_init(struct sem *sem, int count);
  21 __attribute__ ((warn_unused_result)) int down(struct sem *sem, u32 timeout);
  22 void up(struct sem *sem);
  23
  24
  25 struct mutex {
  26         volatile int locked;
  27         struct list tasks; /* tasks waiting on mutexaphore */
  28         struct lock lock;
  29 };
  30
  31 void mutex_init(struct mutex *mutex, int count);
  32 __attribute__ ((warn_unused_result)) int mutex_down(struct mutex *mutex, u32 timeout);
  33 __attribute__ ((warn_unused_result)) int mutex_downtry(struct mutex *mutex);
  34 void mutex_up(struct mutex *mutex);
  35
  36 #endif