Add TLS detection m4 macro
[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
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19#include <stddef.h>
20
16aa9ee8 21struct cds_hlist_head
63ff4873 22{
16aa9ee8 23 struct cds_hlist_node *next;
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24};
25
16aa9ee8 26struct cds_hlist_node
63ff4873 27{
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28 struct cds_hlist_node *next;
29 struct cds_hlist_node *prev;
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30};
31
32/* Initialize a new list head. */
16aa9ee8 33static inline void CDS_INIT_HLIST_HEAD(struct cds_hlist_head *ptr)
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34{
35 ptr->next = NULL;
36}
37
38/* Get typed element from list at a given position. */
16aa9ee8 39#define cds_hlist_entry(ptr, type, member) \
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40 ((type *) ((char *) (ptr) - (unsigned long) (&((type *) 0)->member)))
41
42/* Add new element at the head of the list. */
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43static inline void cds_hlist_add_head (struct cds_hlist_node *newp,
44 struct cds_hlist_head *head)
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45{
46 if (head->next)
47 head->next->prev = newp;
48
49 newp->next = head->next;
16aa9ee8 50 newp->prev = (struct cds_hlist_node *)head;
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51 head->next = newp;
52}
53
54/* Remove element from list. */
16aa9ee8 55static inline void cds_hlist_del (struct cds_hlist_node *elem)
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56{
57 if (elem->next)
58 elem->next->prev = elem->prev;
59
60 elem->prev->next = elem->next;
61}
62
16aa9ee8 63#define cds_hlist_for_each_entry(entry, pos, head, member) \
63ff4873 64 for (pos = (head)->next, \
16aa9ee8 65 entry = cds_hlist_entry(pos, typeof(*entry), member); \
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66 pos != NULL; \
67 pos = pos->next, \
16aa9ee8 68 entry = cds_hlist_entry(pos, typeof(*entry), member))
63ff4873 69
16aa9ee8 70#define cds_hlist_for_each_entry_safe(entry, pos, p, head, member) \
63ff4873 71 for (pos = (head)->next, \
16aa9ee8 72 entry = cds_hlist_entry(pos, typeof(*entry), member); \
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73 (pos != NULL) && ({ p = pos->next; 1;}); \
74 pos = p, \
16aa9ee8 75 entry = cds_hlist_entry(pos, typeof(*entry), member))
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76
77#endif /* _KCOMPAT_HLIST_H */
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