ngx_event_timer_sentinel   18 event/ngx_event_timer.c static ngx_rbtree_node_t          ngx_event_timer_sentinel;
ngx_event_timer_sentinel   29 event/ngx_event_timer.c     ngx_rbtree_init(&ngx_event_timer_rbtree, &ngx_event_timer_sentinel,
ngx_event_timer_sentinel   56 event/ngx_event_timer.c     if (ngx_event_timer_rbtree.root == &ngx_event_timer_sentinel) {