NAME
    AddHead -- insert node at the head of a list

SYNOPSIS
    AddHead(list, node)
            A0    A1

    void AddHead(struct List *, struct Node *)

FUNCTION
    Add a node to the head of a doubly linked list. Assembly
    programmers may prefer to use the ADDHEAD macro from
    "exec/lists.i".

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 at head

SEE ALSO
    AddTail, Enqueue, Insert, Remove, RemHead, RemTail