element 515 libdb/queue.h struct quehead *element = a, *head = b; element 517 libdb/queue.h element->qh_link = head->qh_link; element 518 libdb/queue.h element->qh_rlink = head; element 519 libdb/queue.h head->qh_link = element; element 520 libdb/queue.h element->qh_link->qh_rlink = element; element 526 libdb/queue.h struct quehead *element = a; element 528 libdb/queue.h element->qh_link->qh_rlink = element->qh_rlink; element 529 libdb/queue.h element->qh_rlink->qh_link = element->qh_link; element 530 libdb/queue.h element->qh_rlink = 0;