Function blockcount_acquire

freebsd/sys/blockcount.h:54–65

}

static __inline void
blockcount_acquire(blockcount_t *bc, u_int n)
{
#ifdef INVARIANTS
	u_int old;

	old = atomic_fetchadd_int(&bc->__count, n);
	KASSERT(old + n > old, ("%s: counter overflow %p", __func__, bc));
#else
	atomic_add_int(&bc->__count, n);
#endif
}

static __inline void
blockcount_release(blockcount_t *bc, u_int n)