void active_list_add(struct active_list *head, struct active_list *node);
struct active_list *active_list_move_node(struct active_list *old_head, struct active_list *new_head, struct active_list *node);
+struct active_list * active_list_sort(struct active_list *head, int (*compare_fcn_t)(const void *, const void *));
+
struct active_list * active_list_next(struct active_list *head, struct active_list *ptr);
struct active_list * active_list_prev(struct active_list *head, struct active_list *ptr);