Fix: handle sys_futex() FUTEX_WAIT interrupted by signal
[urcu.git] / urcu / rculist.h
CommitLineData
a00718e7
MD
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
63ff4873
MD
25#ifndef _URCU_RCULIST_H
26#define _URCU_RCULIST_H
27
28#include <urcu/list.h>
3cd243cb
MD
29#include <urcu/arch.h>
30#include <urcu-pointer.h>
7a50dcf7 31
e6decba5
MD
32/* Add new element at the head of the list. */
33static inline
34void cds_list_add_rcu(struct cds_list_head *newp, struct cds_list_head *head)
7a50dcf7 35{
63ff4873
MD
36 newp->next = head->next;
37 newp->prev = head;
63ff4873 38 head->next->prev = newp;
db757a4e 39 rcu_assign_pointer(head->next, newp);
7a50dcf7
MD
40}
41
e2fcb2d3
MD
42/* Add new element at the tail of the list. */
43static inline
44void cds_list_add_tail_rcu(struct cds_list_head *newp,
45 struct cds_list_head *head)
46{
47 newp->next = head;
48 newp->prev = head->prev;
49 rcu_assign_pointer(head->prev->next, newp);
50 head->prev = newp;
51}
52
e6decba5
MD
53/*
54 * Replace an old entry atomically with respect to concurrent RCU
55 * traversal. Mutual exclusion against concurrent updates is required
56 * though.
5db941e8 57 */
e6decba5
MD
58static inline
59void cds_list_replace_rcu(struct cds_list_head *old, struct cds_list_head *_new)
5db941e8
MD
60{
61 _new->next = old->next;
62 _new->prev = old->prev;
63 rcu_assign_pointer(_new->prev->next, _new);
64 _new->next->prev = _new;
65}
7a50dcf7 66
63ff4873 67/* Remove element from list. */
e6decba5
MD
68static inline
69void cds_list_del_rcu(struct cds_list_head *elem)
7a50dcf7 70{
63ff4873 71 elem->next->prev = elem->prev;
db757a4e 72 CMM_STORE_SHARED(elem->prev->next, elem->next);
7a50dcf7
MD
73}
74
5db941e8
MD
75/*
76 * Iteration through all elements of the list must be done while rcu_read_lock()
77 * is held.
78 */
79
80/* Iterate forward over the elements of the list. */
16aa9ee8 81#define cds_list_for_each_rcu(pos, head) \
e6decba5
MD
82 for (pos = rcu_dereference((head)->next); pos != (head); \
83 pos = rcu_dereference(pos->next))
5db941e8 84
7a50dcf7 85
e6decba5
MD
86/* Iterate through elements of the list. */
87#define cds_list_for_each_entry_rcu(pos, head, member) \
88 for (pos = cds_list_entry(rcu_dereference((head)->next), __typeof__(*pos), member); \
89 &pos->member != (head); \
90 pos = cds_list_entry(rcu_dereference(pos->member.next), __typeof__(*pos), member))
7a50dcf7 91
63ff4873 92#endif /* _URCU_RCULIST_H */
This page took 0.047472 seconds and 4 git commands to generate.