22 	posix_tnode *back, *curr, **front;  in tdestroy()  local
29 	back = rootp;  in tdestroy()
30 	front = &back;  in tdestroy()
34 		 * The sequence of nodes from back to just before *front linked  in tdestroy()
50 		if (back == NULL)  in tdestroy()
55 		 * the rlink of the back node the new *front, the llink of the  in tdestroy()
56 		 * back node the new back, and free the old back node.  in tdestroy()
58 		curr = back;  in tdestroy()
59 		back = curr->llink;  in tdestroy()
60 		if (back == NULL)  in tdestroy()
61 			front = &back;  in tdestroy()