Hi, Why should LISTs only be forward traversable? The following piece of code make lists backward traversable:
/sys/sys/queue.h: +#define LIST_PREV(head,elm,field) \ + (((elm) == LIST_FIRST(head)) ? ((__typeof(elm))0) : \ + ((__typeof(elm))(((uint8_t *)((elm)->field.le_prev)) - \ + ((uint8_t *)&LIST_NEXT((__typeof(elm))0,field))))) Any comments? --HPS _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
