Documentation: rculfhash: cds_lfht_resize not within read-side C.S.
[urcu.git] / urcu / rculist.h
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 */
24
25 #ifndef _URCU_RCULIST_H
26 #define _URCU_RCULIST_H
27
28 #include <urcu/list.h>
29 #include <urcu/arch.h>
30 #include <urcu-pointer.h>
31
32 /* Add new element at the head of the list.
33 */
34 static inline void cds_list_add_rcu(struct cds_list_head *newp, struct cds_list_head *head)
35 {
36 newp->next = head->next;
37 newp->prev = head;
38 cmm_smp_wmb();
39 head->next->prev = newp;
40 head->next = newp;
41 }
42
43 /* replace an old entry atomically.
44 */
45 static inline void cds_list_replace_rcu(struct cds_list_head *old, struct cds_list_head *_new)
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 }
52
53 /* Remove element from list. */
54 static inline void cds_list_del_rcu(struct cds_list_head *elem)
55 {
56 elem->next->prev = elem->prev;
57 elem->prev->next = elem->next;
58 }
59
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. */
66 #define cds_list_for_each_rcu(pos, head) \
67 for (pos = rcu_dereference((head)->next); pos != (head); \
68 pos = rcu_dereference(pos->next))
69
70
71 /* Iterate through elements of the list.
72 */
73 #define cds_list_for_each_entry_rcu(pos, head, member) \
74 for (pos = cds_list_entry(rcu_dereference((head)->next), __typeof__(*pos), member); \
75 &pos->member != (head); \
76 pos = cds_list_entry(rcu_dereference(pos->member.next), __typeof__(*pos), member))
77
78 #endif /* _URCU_RCULIST_H */
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