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1 | #ifndef _LINUX_REFCOUNT_H |
2 | #define _LINUX_REFCOUNT_H | |
3 | ||
f405df5d | 4 | #include <linux/atomic.h> |
f405df5d PZ |
5 | #include <linux/mutex.h> |
6 | #include <linux/spinlock.h> | |
318b1ded | 7 | #include <linux/kernel.h> |
f405df5d | 8 | |
f405df5d PZ |
9 | typedef struct refcount_struct { |
10 | atomic_t refs; | |
11 | } refcount_t; | |
12 | ||
13 | #define REFCOUNT_INIT(n) { .refs = ATOMIC_INIT(n), } | |
14 | ||
15 | static inline void refcount_set(refcount_t *r, unsigned int n) | |
16 | { | |
17 | atomic_set(&r->refs, n); | |
18 | } | |
19 | ||
20 | static inline unsigned int refcount_read(const refcount_t *r) | |
21 | { | |
22 | return atomic_read(&r->refs); | |
23 | } | |
24 | ||
29dee3c0 PZ |
25 | extern __must_check bool refcount_add_not_zero(unsigned int i, refcount_t *r); |
26 | extern void refcount_add(unsigned int i, refcount_t *r); | |
f405df5d | 27 | |
29dee3c0 PZ |
28 | extern __must_check bool refcount_inc_not_zero(refcount_t *r); |
29 | extern void refcount_inc(refcount_t *r); | |
f405df5d | 30 | |
29dee3c0 PZ |
31 | extern __must_check bool refcount_sub_and_test(unsigned int i, refcount_t *r); |
32 | extern void refcount_sub(unsigned int i, refcount_t *r); | |
f405df5d | 33 | |
29dee3c0 PZ |
34 | extern __must_check bool refcount_dec_and_test(refcount_t *r); |
35 | extern void refcount_dec(refcount_t *r); | |
f405df5d | 36 | |
29dee3c0 PZ |
37 | extern __must_check bool refcount_dec_if_one(refcount_t *r); |
38 | extern __must_check bool refcount_dec_not_one(refcount_t *r); | |
39 | extern __must_check bool refcount_dec_and_mutex_lock(refcount_t *r, struct mutex *lock); | |
40 | extern __must_check bool refcount_dec_and_lock(refcount_t *r, spinlock_t *lock); | |
f405df5d PZ |
41 | |
42 | #endif /* _LINUX_REFCOUNT_H */ |