include/linux/rwlock.h

18   extern void __rwlock_init(rwlock_t *lock, const char *name,
20 # define rwlock_init(lock)					\
24 	__rwlock_init((lock), #lock, &__key);			\
27 # define rwlock_init(lock)					\
28 	do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0)
32  extern void do_raw_read_lock(rwlock_t *lock) __acquires(lock);
33  extern int do_raw_read_trylock(rwlock_t *lock);
34  extern void do_raw_read_unlock(rwlock_t *lock) __releases(lock);
35  extern void do_raw_write_lock(rwlock_t *lock) __acquires(lock);
36  extern int do_raw_write_trylock(rwlock_t *lock);
37  extern void do_raw_write_unlock(rwlock_t *lock) __releases(lock);
39 # define do_raw_read_lock(rwlock)	do {__acquire(lock); arch_read_lock(&(rwlock)->raw_lock); } while (0)
41 # define do_raw_read_unlock(rwlock)	do {arch_read_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)
42 # define do_raw_write_lock(rwlock)	do {__acquire(lock); arch_write_lock(&(rwlock)->raw_lock); } while (0)
44 # define do_raw_write_unlock(rwlock)	do {arch_write_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)
52 #define read_trylock(lock)	__cond_lock(lock, _raw_read_trylock(lock))
53 #define write_trylock(lock)	__cond_lock(lock, _raw_write_trylock(lock))
55 #define write_lock(lock)	_raw_write_lock(lock)
56 #define read_lock(lock)		_raw_read_lock(lock)
59 #define write_lock_nested(lock, subclass)	_raw_write_lock_nested(lock, subclass)
61 #define write_lock_nested(lock, subclass)	_raw_write_lock(lock)
66 #define read_lock_irqsave(lock, flags)			\
69 		flags = _raw_read_lock_irqsave(lock);	\
71 #define write_lock_irqsave(lock, flags)			\
74 		flags = _raw_write_lock_irqsave(lock);	\
79 #define read_lock_irqsave(lock, flags)			\
82 		_raw_read_lock_irqsave(lock, flags);	\
84 #define write_lock_irqsave(lock, flags)			\
87 		_raw_write_lock_irqsave(lock, flags);	\
92 #define read_lock_irq(lock)		_raw_read_lock_irq(lock)
93 #define read_lock_bh(lock)		_raw_read_lock_bh(lock)
94 #define write_lock_irq(lock)		_raw_write_lock_irq(lock)
95 #define write_lock_bh(lock)		_raw_write_lock_bh(lock)
96 #define read_unlock(lock)		_raw_read_unlock(lock)
97 #define write_unlock(lock)		_raw_write_unlock(lock)
98 #define read_unlock_irq(lock)		_raw_read_unlock_irq(lock)
99 #define write_unlock_irq(lock)		_raw_write_unlock_irq(lock)
101 #define read_unlock_irqrestore(lock, flags)			\
104 		_raw_read_unlock_irqrestore(lock, flags);	\
106 #define read_unlock_bh(lock)		_raw_read_unlock_bh(lock)
108 #define write_unlock_irqrestore(lock, flags)		\
111 		_raw_write_unlock_irqrestore(lock, flags);	\
113 #define write_unlock_bh(lock)		_raw_write_unlock_bh(lock)
115 #define write_trylock_irqsave(lock, flags) \
118 	write_trylock(lock) ? \
123 #define rwlock_is_contended(lock) \
124 	 arch_rwlock_is_contended(&(lock)->raw_lock)
126 #define rwlock_is_contended(lock)	((void)(lock), 0)