1 /* drm_linux_list.h -- linux list functions for the BSDs.
2 * Created: Mon Apr 7 14:30:16 1999 by anholt@FreeBSD.org
3 */
4 /*-
5 * Copyright 2003 Eric Anholt
6 * All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the next
16 * paragraph) shall be included in all copies or substantial portions of the
17 * Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * Authors:
28 * Eric Anholt <anholt@FreeBSD.org>
29 *
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/6.4/sys/dev/drm/drm_linux_list.h 153401 2005-12-14 00:52:59Z anholt $");
34
35 struct list_head {
36 struct list_head *next, *prev;
37 };
38
39 /* Cheat, assume the list_head is at the start of the struct */
40 #define list_entry(entry, type, member) (type *)(entry)
41
42 static __inline__ void
43 INIT_LIST_HEAD(struct list_head *head) {
44 (head)->next = head;
45 (head)->prev = head;
46 }
47
48 static __inline__ int
49 list_empty(struct list_head *head) {
50 return (head)->next == head;
51 }
52
53 static __inline__ void
54 list_add_tail(struct list_head *entry, struct list_head *head) {
55 (entry)->prev = (head)->prev;
56 (entry)->next = head;
57 (head)->prev->next = entry;
58 (head)->prev = entry;
59 }
60
61 static __inline__ void
62 list_del(struct list_head *entry) {
63 (entry)->next->prev = (entry)->prev;
64 (entry)->prev->next = (entry)->next;
65 }
66
67 #define list_for_each(entry, head) \
68 for (entry = (head)->next; entry != head; entry = (entry)->next)
69
70 #define list_for_each_safe(entry, temp, head) \
71 for (entry = (head)->next, temp = (entry)->next; \
72 temp != head; \
73 entry = temp, temp = temp->next)
74
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