| #ifndef _LINUX_REFCOUNT_H |
| #define _LINUX_REFCOUNT_H |
| |
| #include <linux/atomic.h> |
| #include <linux/mutex.h> |
| #include <linux/spinlock.h> |
| #include <linux/kernel.h> |
| |
| typedef struct refcount_struct { |
| atomic_t refs; |
| } refcount_t; |
| |
| #define REFCOUNT_INIT(n) { .refs = ATOMIC_INIT(n), } |
| |
| static inline void refcount_set(refcount_t *r, unsigned int n) |
| { |
| atomic_set(&r->refs, n); |
| } |
| |
| static inline unsigned int refcount_read(const refcount_t *r) |
| { |
| return atomic_read(&r->refs); |
| } |
| |
| extern __must_check bool refcount_add_not_zero(unsigned int i, refcount_t *r); |
| extern void refcount_add(unsigned int i, refcount_t *r); |
| |
| extern __must_check bool refcount_inc_not_zero(refcount_t *r); |
| extern void refcount_inc(refcount_t *r); |
| |
| extern __must_check bool refcount_sub_and_test(unsigned int i, refcount_t *r); |
| extern void refcount_sub(unsigned int i, refcount_t *r); |
| |
| extern __must_check bool refcount_dec_and_test(refcount_t *r); |
| extern void refcount_dec(refcount_t *r); |
| |
| extern __must_check bool refcount_dec_if_one(refcount_t *r); |
| extern __must_check bool refcount_dec_not_one(refcount_t *r); |
| extern __must_check bool refcount_dec_and_mutex_lock(refcount_t *r, struct mutex *lock); |
| extern __must_check bool refcount_dec_and_lock(refcount_t *r, spinlock_t *lock); |
| |
| #endif /* _LINUX_REFCOUNT_H */ |