36 #define INIT_LINK_TYPE(elt, link, type) \  argument
38 		(elt)->link.prev = (type *)(-1); \
39 		(elt)->link.next = (type *)(-1); \
41 #define INIT_LINK(elt, link) \  argument
42 	INIT_LINK_TYPE(elt, link, void)
43 #define LINKED(elt, link) ((void *)((elt)->link.prev) != (void *)(-1) && \  argument
44 			   (void *)((elt)->link.next) != (void *)(-1))
50 #define PREPEND(list, elt, link) \  argument
52 		INSIST(!LINKED(elt, link));\
54 			(list).head->link.prev = (elt); \
57 		(elt)->link.prev = NULL; \
58 		(elt)->link.next = (list).head; \
62 #define APPEND(list, elt, link) \  argument
64 		INSIST(!LINKED(elt, link));\
66 			(list).tail->link.next = (elt); \
69 		(elt)->link.prev = (list).tail; \
70 		(elt)->link.next = NULL; \
74 #define UNLINK_TYPE(list, elt, link, type) \  argument
76 		INSIST(LINKED(elt, link));\
77 		if ((elt)->link.next != NULL) \
78 			(elt)->link.next->link.prev = (elt)->link.prev; \
81 			(list).tail = (elt)->link.prev; \
83 		if ((elt)->link.prev != NULL) \
84 			(elt)->link.prev->link.next = (elt)->link.next; \
87 			(list).head = (elt)->link.next; \
89 		INIT_LINK_TYPE(elt, link, type); \
91 #define UNLINK(list, elt, link) \  argument
92 	UNLINK_TYPE(list, elt, link, void)
94 #define PREV(elt, link) ((elt)->link.prev)  argument
95 #define NEXT(elt, link) ((elt)->link.next)  argument
97 #define INSERT_BEFORE(list, before, elt, link) \  argument
99 		INSIST(!LINKED(elt, link));\
100 		if ((before)->link.prev == NULL) \
101 			PREPEND(list, elt, link); \
103 			(elt)->link.prev = (before)->link.prev; \
104 			(before)->link.prev = (elt); \
105 			(elt)->link.prev->link.next = (elt); \
106 			(elt)->link.next = (before); \
110 #define INSERT_AFTER(list, after, elt, link) \  argument
112 		INSIST(!LINKED(elt, link));\
113 		if ((after)->link.next == NULL) \
114 			APPEND(list, elt, link); \
116 			(elt)->link.next = (after)->link.next; \
117 			(after)->link.next = (elt); \
118 			(elt)->link.next->link.prev = (elt); \
119 			(elt)->link.prev = (after); \
123 #define ENQUEUE(list, elt, link) APPEND(list, elt, link)  argument
124 #define DEQUEUE(list, elt, link) UNLINK(list, elt, link)  argument