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 __MUTEX_INITIALIZER(name)                                             \
  22         __SEMAPHORE_INITIALIZER (name,1)
  23
  24 #define __DECLARE_SEMAPHORE_GENERIC(name,count) \
  25         struct semaphore name = __SEMAPHORE_INITIALIZER (name,count)
  26
  27 #define DECLARE_MUTEX(name)             __DECLARE_SEMAPHORE_GENERIC (name,1)
  28 #define DECLARE_MUTEX_LOCKED(name)      __DECLARE_SEMAPHORE_GENERIC (name,0)
  29
  30 extern inline void sema_init (struct semaphore *sem, int val)
  31 {
  32         *sem = (struct semaphore)__SEMAPHORE_INITIALIZER((*sem),val);
  33 }
  34
  35 static inline void init_MUTEX (struct semaphore *sem)
  36 {
  37         sema_init (sem, 1);
  38 }
  39
  40 static inline void init_MUTEX_LOCKED (struct semaphore *sem)
  41 {
  42         sema_init (sem, 0);
  43 }
  44
  45 /*
  46  * special register calling convention
  47  */
  48 asmlinkage void __down_failed (void);
  49 asmlinkage int  __down_interruptible_failed (void);
  50 asmlinkage int  __down_trylock_failed (void);
  51 asmlinkage void __up_wakeup (void);
  52
  53 extern void __down (struct semaphore * sem);
  54 extern int  __down_interruptible (struct semaphore * sem);
  55 extern int  __down_trylock (struct semaphore * sem);
  56 extern void __up (struct semaphore * sem);
  57
  58 extern inline void down (struct semaphore * sem)
  59 {
  60         might_sleep();
  61         if (atomic_dec_return (&sem->count) < 0)
  62                 __down (sem);
  63 }
  64
  65 extern inline int down_interruptible (struct semaphore * sem)
  66 {
  67         int ret = 0;
  68         might_sleep();
  69         if (atomic_dec_return (&sem->count) < 0)
  70                 ret = __down_interruptible (sem);
  71         return ret;
  72 }
  73
  74 extern inline int down_trylock (struct semaphore *sem)
  75 {
  76         int ret = 0;
  77         if (atomic_dec_return (&sem->count) < 0)
  78                 ret = __down_trylock (sem);
  79         return ret;
  80 }
  81
  82 extern inline void up (struct semaphore * sem)
  83 {
  84         if (atomic_inc_return (&sem->count) <= 0)
  85                 __up (sem);
  86 }
  87
  88 #endif /* __V850_SEMAPHORE_H__ */