1 | /* vi: set sw=4 ts=4: */
|
---|
2 | #ifndef LINUX_LIST_H
|
---|
3 | #define LINUX_LIST_H 1
|
---|
4 |
|
---|
5 | /*
|
---|
6 | * Simple doubly linked list implementation.
|
---|
7 | *
|
---|
8 | * Some of the internal functions ("__xxx") are useful when
|
---|
9 | * manipulating whole lists rather than single entries, as
|
---|
10 | * sometimes we already know the next/prev entries and we can
|
---|
11 | * generate better code by using them directly rather than
|
---|
12 | * using the generic single-entry routines.
|
---|
13 | */
|
---|
14 |
|
---|
15 | struct list_head {
|
---|
16 | struct list_head *next, *prev;
|
---|
17 | };
|
---|
18 |
|
---|
19 | #define LIST_HEAD_INIT(name) { &(name), &(name) }
|
---|
20 |
|
---|
21 | #define LIST_HEAD(name) \
|
---|
22 | struct list_head name = { &name, &name }
|
---|
23 |
|
---|
24 | #define INIT_LIST_HEAD(ptr) do { \
|
---|
25 | (ptr)->next = (ptr); (ptr)->prev = (ptr); \
|
---|
26 | } while (0)
|
---|
27 |
|
---|
28 | #if (!defined(__GNUC__) && !defined(__WATCOMC__))
|
---|
29 | #define __inline__
|
---|
30 | #endif
|
---|
31 |
|
---|
32 | /*
|
---|
33 | * Insert a new entry between two known consecutive entries.
|
---|
34 | *
|
---|
35 | * This is only for internal list manipulation where we know
|
---|
36 | * the prev/next entries already!
|
---|
37 | */
|
---|
38 | static __inline__ void __list_add(struct list_head * new,
|
---|
39 | struct list_head * prev,
|
---|
40 | struct list_head * next)
|
---|
41 | {
|
---|
42 | next->prev = new;
|
---|
43 | new->next = next;
|
---|
44 | new->prev = prev;
|
---|
45 | prev->next = new;
|
---|
46 | }
|
---|
47 |
|
---|
48 | /*
|
---|
49 | * Insert a new entry after the specified head..
|
---|
50 | */
|
---|
51 | static __inline__ void list_add(struct list_head *new, struct list_head *head)
|
---|
52 | {
|
---|
53 | __list_add(new, head, head->next);
|
---|
54 | }
|
---|
55 |
|
---|
56 | /*
|
---|
57 | * Insert a new entry at the tail
|
---|
58 | */
|
---|
59 | static __inline__ void list_add_tail(struct list_head *new, struct list_head *head)
|
---|
60 | {
|
---|
61 | __list_add(new, head->prev, head);
|
---|
62 | }
|
---|
63 |
|
---|
64 | /*
|
---|
65 | * Delete a list entry by making the prev/next entries
|
---|
66 | * point to each other.
|
---|
67 | *
|
---|
68 | * This is only for internal list manipulation where we know
|
---|
69 | * the prev/next entries already!
|
---|
70 | */
|
---|
71 | static __inline__ void __list_del(struct list_head * prev,
|
---|
72 | struct list_head * next)
|
---|
73 | {
|
---|
74 | next->prev = prev;
|
---|
75 | prev->next = next;
|
---|
76 | }
|
---|
77 |
|
---|
78 | static __inline__ void list_del(struct list_head *entry)
|
---|
79 | {
|
---|
80 | __list_del(entry->prev, entry->next);
|
---|
81 | }
|
---|
82 |
|
---|
83 | static __inline__ int list_empty(struct list_head *head)
|
---|
84 | {
|
---|
85 | return head->next == head;
|
---|
86 | }
|
---|
87 |
|
---|
88 | /*
|
---|
89 | * Splice in "list" into "head"
|
---|
90 | */
|
---|
91 | static __inline__ void list_splice(struct list_head *list, struct list_head *head)
|
---|
92 | {
|
---|
93 | struct list_head *first = list->next;
|
---|
94 |
|
---|
95 | if (first != list) {
|
---|
96 | struct list_head *last = list->prev;
|
---|
97 | struct list_head *at = head->next;
|
---|
98 |
|
---|
99 | first->prev = head;
|
---|
100 | head->next = first;
|
---|
101 |
|
---|
102 | last->next = at;
|
---|
103 | at->prev = last;
|
---|
104 | }
|
---|
105 | }
|
---|
106 |
|
---|
107 | #define list_entry(ptr, type, member) \
|
---|
108 | ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
|
---|
109 |
|
---|
110 | #define list_for_each(pos, head) \
|
---|
111 | for (pos = (head)->next; pos != (head); pos = pos->next)
|
---|
112 |
|
---|
113 | #endif
|
---|