RCU lfqueue: Now works without reference counting (API change)
[urcu.git] / urcu / rculist.h
1 /* Copyright (C) 2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
4
5 Copyright (C) 2009 Pierre-Marc Fournier
6 Conversion to RCU list.
7 Copyright (C) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8
9 The GNU C Library is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Lesser General Public
11 License as published by the Free Software Foundation; either
12 version 2.1 of the License, or (at your option) any later version.
13
14 The GNU C Library is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
18
19 You should have received a copy of the GNU Lesser General Public
20 License along with the GNU C Library; if not, write to the Free
21 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 02111-1307 USA. */
23
24 #ifndef _URCU_RCULIST_H
25 #define _URCU_RCULIST_H
26
27 #include <urcu/list.h>
28 #include <urcu/arch.h>
29 #include <urcu-pointer.h>
30
31 /* Add new element at the head of the list.
32 */
33 static inline void cds_list_add_rcu(struct cds_list_head *newp, struct cds_list_head *head)
34 {
35 newp->next = head->next;
36 newp->prev = head;
37 cmm_smp_wmb();
38 head->next->prev = newp;
39 head->next = newp;
40 }
41
42 /* replace an old entry atomically.
43 */
44 static inline void cds_list_replace_rcu(struct cds_list_head *old, struct cds_list_head *_new)
45 {
46 _new->next = old->next;
47 _new->prev = old->prev;
48 rcu_assign_pointer(_new->prev->next, _new);
49 _new->next->prev = _new;
50 }
51
52 /* Remove element from list. */
53 static inline void cds_list_del_rcu(struct cds_list_head *elem)
54 {
55 elem->next->prev = elem->prev;
56 elem->prev->next = elem->next;
57 }
58
59 /*
60 * Iteration through all elements of the list must be done while rcu_read_lock()
61 * is held.
62 */
63
64 /* Iterate forward over the elements of the list. */
65 #define cds_list_for_each_rcu(pos, head) \
66 for (pos = rcu_dereference((head)->next); pos != (head); \
67 pos = rcu_dereference(pos->next))
68
69
70 /* Iterate through elements of the list.
71 */
72 #define cds_list_for_each_entry_rcu(pos, head, member) \
73 for (pos = cds_list_entry(rcu_dereference((head)->next), typeof(*pos), member); \
74 &pos->member != (head); \
75 pos = cds_list_entry(rcu_dereference(pos->member.next), typeof(*pos), member))
76
77 #endif /* _URCU_RCULIST_H */
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