_rw_init
_rw_init(rw, (uintptr_t)__builtin_return_address(0));
_rw_init(&ro->ro_lock, (uintptr_t)__builtin_return_address(0));
_rw_init(&ro->ro_lock, (uintptr_t)__builtin_return_address(0));
_rw_init(rw, (uintptr_t)__builtin_return_address(0));
void _rw_init(krwlock_t *, uintptr_t);