rt_time
loop_rts.rts_time = rt->rt_time;
loop_rts.rts_time = rt->rt_time;
rt->rt_time = now.tv_sec;
if (now_stale <= RT->rt_time)
if (now_garbage > RT->rt_time) {
if (now.tv_sec - RT->rt_time > EXPIRE_TIME) {
(rt->rt_time != new->rts_time