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TOMOYO Linux Cross Reference
Linux/include/linux/refcount.h

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  1 #ifndef _LINUX_REFCOUNT_H
  2 #define _LINUX_REFCOUNT_H
  3 
  4 #include <linux/atomic.h>
  5 #include <linux/mutex.h>
  6 #include <linux/spinlock.h>
  7 #include <linux/kernel.h>
  8 
  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 
 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);
 27 
 28 extern __must_check bool refcount_inc_not_zero(refcount_t *r);
 29 extern void refcount_inc(refcount_t *r);
 30 
 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);
 33 
 34 extern __must_check bool refcount_dec_and_test(refcount_t *r);
 35 extern void refcount_dec(refcount_t *r);
 36 
 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);
 41 
 42 #endif /* _LINUX_REFCOUNT_H */
 43 

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