Lines Matching refs:sem
47 extern struct rw_semaphore *rwsem_down_read_failed(struct rw_semaphore *sem);
48 extern struct rw_semaphore *rwsem_down_write_failed(struct rw_semaphore *sem);
49 extern struct rw_semaphore *rwsem_wake(struct rw_semaphore *sem);
50 extern struct rw_semaphore *rwsem_downgrade_wake(struct rw_semaphore *sem);
52 extern void __init_rwsem(struct rw_semaphore *sem, const char *name,
55 #define init_rwsem(sem) \
59 __init_rwsem((sem), #sem, &__key); \
62 static inline void init_rwsem(struct rw_semaphore *sem)
64 sem->count = RWSEM_UNLOCKED_VALUE;
65 spin_lock_init(&sem->wait_lock);
66 INIT_LIST_HEAD(&sem->wait_list);
72 static inline void __down_read(struct rw_semaphore *sem)
74 if (atomic_inc_return((atomic_t *)(&sem->count)) > 0)
77 rwsem_down_read_failed(sem);
80 static inline int __down_read_trylock(struct rw_semaphore *sem)
84 while ((tmp = sem->count) >= 0) {
85 if (tmp == cmpxchg(&sem->count, tmp,
97 static inline void __down_write(struct rw_semaphore *sem)
102 (atomic_t *)(&sem->count));
106 rwsem_down_write_failed(sem);
109 static inline int __down_write_trylock(struct rw_semaphore *sem)
113 tmp = cmpxchg(&sem->count, RWSEM_UNLOCKED_VALUE,
122 static inline void __up_read(struct rw_semaphore *sem)
127 tmp = atomic_dec_return((atomic_t *)(&sem->count));
129 rwsem_wake(sem);
135 static inline void __up_write(struct rw_semaphore *sem)
139 (atomic_t *)(&sem->count)) < 0)
140 rwsem_wake(sem);
146 static inline void rwsem_atomic_add(int delta, struct rw_semaphore *sem)
148 atomic_add(delta, (atomic_t *)(&sem->count));
154 static inline void __downgrade_write(struct rw_semaphore *sem)
159 tmp = atomic_add_return(-RWSEM_WAITING_BIAS, (atomic_t *)(&sem->count));
161 rwsem_downgrade_wake(sem);
164 static inline void __down_write_nested(struct rw_semaphore *sem, int subclass)
166 __down_write(sem);
172 static inline int rwsem_atomic_update(int delta, struct rw_semaphore *sem)
175 return atomic_add_return(delta, (atomic_t *)(&sem->count));
178 static inline int rwsem_is_locked(struct rw_semaphore *sem)
180 return (sem->count != 0);