1 #ifndef _KCOMPAT_HLIST_H
2 #define _KCOMPAT_HLIST_H
5 * Kernel sourcecode compatible lightweight single pointer list head useful
6 * for implementing hash tables
8 * Copyright (C) 2009 Novell Inc.
10 * Author: Jan Blunck <jblunck@suse.de>
12 * Copyright (C) 2010-2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU Lesser General Public License version 2.1 as
16 * published by the Free Software Foundation.
20 #include <urcu/compiler.h>
22 struct cds_hlist_head
{
23 struct cds_hlist_node
*next
;
26 struct cds_hlist_node
{
27 struct cds_hlist_node
*next
, *prev
;
30 /* Initialize a new list head. */
32 void CDS_INIT_HLIST_HEAD(struct cds_hlist_head
*ptr
)
37 #define CDS_HLIST_HEAD(name) \
38 struct cds_hlist_head name = { NULL }
40 #define CDS_HLIST_HEAD_INIT(name) \
43 /* Get typed element from list at a given position. */
44 #define cds_hlist_entry(ptr, type, member) caa_container_of(ptr, type, member)
46 /* Get typed element from list at a given position, keeping NULL pointers. */
47 #define cds_hlist_entry_safe(ptr, type, member) \
49 __typeof__(ptr) ____ret = (ptr); \
50 ____ret ? cds_hlist_entry(____ret, type, member) : NULL; \
53 /* Add new element at the head of the list. */
55 void cds_hlist_add_head(struct cds_hlist_node
*newp
,
56 struct cds_hlist_head
*head
)
59 head
->next
->prev
= newp
;
60 newp
->next
= head
->next
;
61 newp
->prev
= (struct cds_hlist_node
*) head
;
65 /* Remove element from list. */
67 void cds_hlist_del(struct cds_hlist_node
*elem
)
70 elem
->next
->prev
= elem
->prev
;
71 elem
->prev
->next
= elem
->next
;
74 #define cds_hlist_for_each(pos, head) \
75 for (pos = (head)->next; (pos) != NULL; pos = (pos)->next)
77 #define cds_hlist_for_each_safe(pos, p, head) \
78 for (pos = (head)->next; \
79 ((pos) != NULL) && (p = (pos)->next, 1); \
83 * cds_hlist_for_each_entry and cds_hlist_for_each_entry_safe take
84 * respectively 4 and 5 arguments, while the Linux kernel APIs take 3,
85 * and 4. We implement cds_hlist_for_each_entry_2() and
86 * cds_hlist_for_each_entry_safe_2() to follow the Linux kernel APIs.
88 #define cds_hlist_for_each_entry(entry, pos, head, member) \
89 for (pos = (head)->next, \
90 entry = cds_hlist_entry(pos, __typeof__(*(entry)), member); \
93 entry = cds_hlist_entry(pos, __typeof__(*(entry)), member))
95 #define cds_hlist_for_each_entry_safe(entry, pos, p, head, member) \
96 for (pos = (head)->next, \
97 entry = cds_hlist_entry(pos, __typeof__(*(entry)), member); \
98 ((pos) != NULL) && (p = (pos)->next, 1); \
100 entry = cds_hlist_entry(pos, __typeof__(*entry), member))
102 #define cds_hlist_for_each_entry_2(entry, head, member) \
103 for (entry = cds_hlist_entry_safe((head)->next, __typeof__(*(entry)), member); \
105 entry = cds_hlist_entry_safe((entry)->member.next, __typeof__(*(entry)), member))
107 #define cds_hlist_for_each_entry_safe_2(entry, e, head, member) \
108 for (entry = cds_hlist_entry_safe((head)->next, __typeof__(*(entry)), member); \
109 ((entry) != NULL) && (e = (cds_hlist_entry_safe((entry)->member.next, \
110 __typeof__(*(entry)), member)), 1); \
113 #endif /* _KCOMPAT_HLIST_H */
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