V_rtables_lock
#define RTABLES_LOCK() sx_xlock(&V_rtables_lock)
#define RTABLES_UNLOCK() sx_xunlock(&V_rtables_lock)
#define RTABLES_LOCK_INIT() sx_init(&V_rtables_lock, "rtables lock")
#define RTABLES_LOCK_ASSERT() sx_assert(&V_rtables_lock, SA_LOCKED)