Map symbols to allow multiple RCU flavors to be used in one binary
[urcu.git] / urcu / hlist.h
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1#ifndef _KCOMPAT_HLIST_H
2#define _KCOMPAT_HLIST_H
3
4/*
5 * Kernel sourcecode compatible lightweight single pointer list head useful
6 * for implementing hash tables
7 *
8 * Copyright (C) 2009 Novell Inc.
9 *
10 * Author: Jan Blunck <jblunck@suse.de>
11 *
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12 * Copyright (C) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
13 *
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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.
17 */
18
16aa9ee8 19struct cds_hlist_head
63ff4873 20{
16aa9ee8 21 struct cds_hlist_node *next;
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22};
23
16aa9ee8 24struct cds_hlist_node
63ff4873 25{
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26 struct cds_hlist_node *next;
27 struct cds_hlist_node *prev;
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28};
29
30/* Initialize a new list head. */
16aa9ee8 31static inline void CDS_INIT_HLIST_HEAD(struct cds_hlist_head *ptr)
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32{
33 ptr->next = NULL;
34}
35
36/* Get typed element from list at a given position. */
16aa9ee8 37#define cds_hlist_entry(ptr, type, member) \
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38 ((type *) ((char *) (ptr) - (unsigned long) (&((type *) 0)->member)))
39
40/* Add new element at the head of the list. */
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41static inline void cds_hlist_add_head (struct cds_hlist_node *newp,
42 struct cds_hlist_head *head)
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43{
44 if (head->next)
45 head->next->prev = newp;
46
47 newp->next = head->next;
16aa9ee8 48 newp->prev = (struct cds_hlist_node *)head;
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49 head->next = newp;
50}
51
52/* Remove element from list. */
16aa9ee8 53static inline void cds_hlist_del (struct cds_hlist_node *elem)
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54{
55 if (elem->next)
56 elem->next->prev = elem->prev;
57
58 elem->prev->next = elem->next;
59}
60
16aa9ee8 61#define cds_hlist_for_each_entry(entry, pos, head, member) \
63ff4873 62 for (pos = (head)->next, \
16aa9ee8 63 entry = cds_hlist_entry(pos, typeof(*entry), member); \
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64 pos != NULL; \
65 pos = pos->next, \
16aa9ee8 66 entry = cds_hlist_entry(pos, typeof(*entry), member))
63ff4873 67
16aa9ee8 68#define cds_hlist_for_each_entry_safe(entry, pos, p, head, member) \
63ff4873 69 for (pos = (head)->next, \
16aa9ee8 70 entry = cds_hlist_entry(pos, typeof(*entry), member); \
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71 (pos != NULL) && ({ p = pos->next; 1;}); \
72 pos = p, \
16aa9ee8 73 entry = cds_hlist_entry(pos, typeof(*entry), member))
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74
75#endif /* _KCOMPAT_HLIST_H */
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