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[urcu.git] / urcu / rculist.h
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1/*
2 * Copyright (C) 2002 Free Software Foundation, Inc.
3 * (originally part of the GNU C Library)
4 * Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 *
6 * Copyright (C) 2009 Pierre-Marc Fournier
7 * Conversion to RCU list.
8 * Copyright (C) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 *
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with this library; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
7a50dcf7 24
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25#ifndef _URCU_RCULIST_H
26#define _URCU_RCULIST_H
27
28#include <urcu/list.h>
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29#include <urcu/arch.h>
30#include <urcu-pointer.h>
7a50dcf7 31
63ff4873 32/* Add new element at the head of the list.
7a50dcf7 33 */
34cfb3e3 34static inline void cds_list_add_rcu(struct cds_list_head *newp, struct cds_list_head *head)
7a50dcf7 35{
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36 newp->next = head->next;
37 newp->prev = head;
5481ddb3 38 cmm_smp_wmb();
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39 head->next->prev = newp;
40 head->next = newp;
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41}
42
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43/* replace an old entry atomically.
44 */
34cfb3e3 45static inline void cds_list_replace_rcu(struct cds_list_head *old, struct cds_list_head *_new)
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46{
47 _new->next = old->next;
48 _new->prev = old->prev;
49 rcu_assign_pointer(_new->prev->next, _new);
50 _new->next->prev = _new;
51}
7a50dcf7 52
63ff4873 53/* Remove element from list. */
34cfb3e3 54static inline void cds_list_del_rcu(struct cds_list_head *elem)
7a50dcf7 55{
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56 elem->next->prev = elem->prev;
57 elem->prev->next = elem->next;
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58}
59
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60/*
61 * Iteration through all elements of the list must be done while rcu_read_lock()
62 * is held.
63 */
64
65/* Iterate forward over the elements of the list. */
16aa9ee8 66#define cds_list_for_each_rcu(pos, head) \
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67 for (pos = rcu_dereference((head)->next); pos != (head); \
68 pos = rcu_dereference(pos->next))
69
7a50dcf7 70
63ff4873 71/* Iterate through elements of the list.
7a50dcf7 72 */
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73#define cds_list_for_each_entry_rcu(pos, head, member) \
74 for (pos = cds_list_entry(rcu_dereference((head)->next), typeof(*pos), member); \
63ff4873 75 &pos->member != (head); \
16aa9ee8 76 pos = cds_list_entry(rcu_dereference(pos->member.next), typeof(*pos), member))
7a50dcf7 77
63ff4873 78#endif /* _URCU_RCULIST_H */
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