Reference count

include/types/refcount.h

• static inline void refcount_init(refcount_t *rc,unsigned int val)
• static inline bool refcount_inc(refcount_t *rc)
• static inline bool refcount_inc_not_zero(refcount_t *rc)
• static inline uint32_t refcount_read(refcount_t *rc)
• static inline bool refcount_dec_and_test(refcount_t *rc)