void server_sync(Server *s);
void server_vacuum(Server *s);
void server_rotate(Server *s);
-int server_schedule_sync(Server *s);
+int server_schedule_sync(Server *s, int priority);
int server_flush_to_var(Server *s);
int process_event(Server *s, struct epoll_event *ev);
void server_maybe_append_tags(Server *s);