44 int _blockcount_sleep(blockcount_t *bc, struct lock_object *, const char *wmesg,
46 void _blockcount_wakeup(blockcount_t *bc, u_int old);
49 blockcount_init(blockcount_t *bc)  in blockcount_init()  argument
51 	atomic_store_int(&bc->__count, 0);  in blockcount_init()
55 blockcount_acquire(blockcount_t *bc, u_int n)  in blockcount_acquire()  argument
60 	old = atomic_fetchadd_int(&bc->__count, n);  in blockcount_acquire()
61 	KASSERT(old + n > old, ("%s: counter overflow %p", __func__, bc));  in blockcount_acquire()
63 	atomic_add_int(&bc->__count, n);  in blockcount_acquire()
68 blockcount_release(blockcount_t *bc, u_int n)  in blockcount_release()  argument
73 	old = atomic_fetchadd_int(&bc->__count, -n);  in blockcount_release()
74 	KASSERT(old >= n, ("%s: counter underflow %p", __func__, bc));  in blockcount_release()
76 		_blockcount_wakeup(bc, old);  in blockcount_release()
80 _blockcount_wait(blockcount_t *bc, struct lock_object *lo, const char *wmesg,  in _blockcount_wait()  argument
85 	while (_blockcount_sleep(bc, lo, wmesg, prio) == EAGAIN)  in _blockcount_wait()
89 #define	blockcount_sleep(bc, lo, wmesg, prio)	\  argument
90 	_blockcount_sleep((bc), (struct lock_object *)(lo), (wmesg), (prio))
91 #define	blockcount_wait(bc, lo, wmesg, prio)	\  argument
92 	_blockcount_wait((bc), (struct lock_object *)(lo), (wmesg), (prio))