include/asm-v850/semaphore.h

   1 #ifndef __V850_SEMAPHORE_H__
   2 #define __V850_SEMAPHORE_H__
   3
   4 #include <linux/linkage.h>
   5 #include <linux/spinlock.h>
   6 #include <linux/wait.h>
   7 #include <linux/rwsem.h>
   8
   9 #include <asm/atomic.h>
  10
  11 struct semaphore {
  12         atomic_t count;
  13         int sleepers;
  14         wait_queue_head_t wait;
  15 };
  16
  17 #define __SEMAPHORE_INITIALIZER(name,count)                                   \
  18         { ATOMIC_INIT (count), 0,                                             \
  19           __WAIT_QUEUE_HEAD_INITIALIZER ((name).wait) }
  20
  21 #define __DECLARE_SEMAPHORE_GENERIC(name,count) \
  22         struct semaphore name = __SEMAPHORE_INITIALIZER (name,count)
  23
  24 #define DECLARE_MUTEX(name)             __DECLARE_SEMAPHORE_GENERIC (name,1)
  25
  26 static inline void sema_init (struct semaphore *sem, int val)
  27 {
  28         *sem = (struct semaphore)__SEMAPHORE_INITIALIZER((*sem),val);
  29 }
  30
  31 static inline void init_MUTEX (struct semaphore *sem)
  32 {
  33         sema_init (sem, 1);
  34 }
  35
  36 static inline void init_MUTEX_LOCKED (struct semaphore *sem)
  37 {
  38         sema_init (sem, 0);
  39 }
  40
  41 /*
  42  * special register calling convention
  43  */
  44 asmlinkage void __down_failed (void);
  45 asmlinkage int  __down_interruptible_failed (void);
  46 asmlinkage int  __down_trylock_failed (void);
  47 asmlinkage void __up_wakeup (void);
  48
  49 extern void __down (struct semaphore * sem);
  50 extern int  __down_interruptible (struct semaphore * sem);
  51 extern int  __down_trylock (struct semaphore * sem);
  52 extern void __up (struct semaphore * sem);
  53
  54 static inline void down (struct semaphore * sem)
  55 {
  56         might_sleep();
  57         if (atomic_dec_return (&sem->count) < 0)
  58                 __down (sem);
  59 }
  60
  61 static inline int down_interruptible (struct semaphore * sem)
  62 {
  63         int ret = 0;
  64         might_sleep();
  65         if (atomic_dec_return (&sem->count) < 0)
  66                 ret = __down_interruptible (sem);
  67         return ret;
  68 }
  69
  70 static inline int down_trylock (struct semaphore *sem)
  71 {
  72         int ret = 0;
  73         if (atomic_dec_return (&sem->count) < 0)
  74                 ret = __down_trylock (sem);
  75         return ret;
  76 }
  77
  78 static inline void up (struct semaphore * sem)
  79 {
  80         if (atomic_inc_return (&sem->count) <= 0)
  81                 __up (sem);
  82 }
  83
  84 #endif /* __V850_SEMAPHORE_H__ */