[ALSA] Merge ad1816a-lib module to ad1816a
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / asm-v850 / semaphore.h
blob735baaf3a16e8fe7478f8307a10be49f1c6a7a09
1 #ifndef __V850_SEMAPHORE_H__
2 #define __V850_SEMAPHORE_H__
4 #include <linux/linkage.h>
5 #include <linux/spinlock.h>
6 #include <linux/wait.h>
7 #include <linux/rwsem.h>
9 #include <asm/atomic.h>
11 struct semaphore {
12 atomic_t count;
13 int sleepers;
14 wait_queue_head_t wait;
17 #define __SEMAPHORE_INITIALIZER(name,count) \
18 { ATOMIC_INIT (count), 0, \
19 __WAIT_QUEUE_HEAD_INITIALIZER ((name).wait) }
21 #define __DECLARE_SEMAPHORE_GENERIC(name,count) \
22 struct semaphore name = __SEMAPHORE_INITIALIZER (name,count)
24 #define DECLARE_MUTEX(name) __DECLARE_SEMAPHORE_GENERIC (name,1)
25 #define DECLARE_MUTEX_LOCKED(name) __DECLARE_SEMAPHORE_GENERIC (name,0)
27 static inline void sema_init (struct semaphore *sem, int val)
29 *sem = (struct semaphore)__SEMAPHORE_INITIALIZER((*sem),val);
32 static inline void init_MUTEX (struct semaphore *sem)
34 sema_init (sem, 1);
37 static inline void init_MUTEX_LOCKED (struct semaphore *sem)
39 sema_init (sem, 0);
43 * special register calling convention
45 asmlinkage void __down_failed (void);
46 asmlinkage int __down_interruptible_failed (void);
47 asmlinkage int __down_trylock_failed (void);
48 asmlinkage void __up_wakeup (void);
50 extern void __down (struct semaphore * sem);
51 extern int __down_interruptible (struct semaphore * sem);
52 extern int __down_trylock (struct semaphore * sem);
53 extern void __up (struct semaphore * sem);
55 static inline void down (struct semaphore * sem)
57 might_sleep();
58 if (atomic_dec_return (&sem->count) < 0)
59 __down (sem);
62 static inline int down_interruptible (struct semaphore * sem)
64 int ret = 0;
65 might_sleep();
66 if (atomic_dec_return (&sem->count) < 0)
67 ret = __down_interruptible (sem);
68 return ret;
71 static inline int down_trylock (struct semaphore *sem)
73 int ret = 0;
74 if (atomic_dec_return (&sem->count) < 0)
75 ret = __down_trylock (sem);
76 return ret;
79 static inline void up (struct semaphore * sem)
81 if (atomic_inc_return (&sem->count) <= 0)
82 __up (sem);
85 #endif /* __V850_SEMAPHORE_H__ */