NAME
    Insert -- insert a node into a list

SYNOPSIS
    Insert(list, node, listNode)
           A0    A1    A2

    void Insert(struct list *, struct node *, struct node *);

FUNCTION
    Insert a node into a doubly linked list AFTER a given node
    position.  Insertion at the head of a list is possible by passing a
    zero value for listNode, though the addhead function is slightly
    faster for that special case.

WARNING
    This function does not arbitrate for access to the list.  The
    calling task must be the owner of the involved list.

INPUTS
    list - a pointer to the target list header
    node - the node to insert
    listNode - the node after which to insert

SEE ALSO
    addhead, addtail, enqueue, remhead, remove, remtail