25 #define INIT_LIST(list) \  argument
39 #define HEAD(list) ((list).head)  argument
40 #define TAIL(list) ((list).tail)  argument
41 #define EMPTY(list) ((list).head == NULL)  argument
43 #define PREPEND(list, elt, link) \  argument
55 #define APPEND(list, elt, link) \  argument
67 #define UNLINK_TYPE(list, elt, link, type) \  argument
84 #define UNLINK(list, elt, link) \  argument
90 #define INSERT_BEFORE(list, before, elt, link) \  argument
103 #define INSERT_AFTER(list, after, elt, link) \  argument
116 #define ENQUEUE(list, elt, link) APPEND(list, elt, link)  argument
117 #define DEQUEUE(list, elt, link) UNLINK(list, elt, link)  argument