bool user_check_gc(User *u, bool drop_not_started);
void user_add_to_gc_queue(User *u);
int user_start(User *u);
-int user_stop(User *u);
+int user_stop(User *u, bool force);
int user_finalize(User *u);
UserState user_get_state(User *u);
int user_get_idle_hint(User *u, dual_timestamp *t);