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.
6 * Copyright (C) 2009 Pierre-Marc Fournier
7 * Conversion to RCU list.
8 * Copyright (C) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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.
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.
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
25 #ifndef _URCU_RCULIST_H
26 #define _URCU_RCULIST_H
28 #include <urcu/list.h>
29 #include <urcu/arch.h>
30 #include <urcu-pointer.h>
32 /* Add new element at the head of the list. */
34 void cds_list_add_rcu(struct cds_list_head
*newp
, struct cds_list_head
*head
)
36 newp
->next
= head
->next
;
39 head
->next
->prev
= newp
;
44 * Replace an old entry atomically with respect to concurrent RCU
45 * traversal. Mutual exclusion against concurrent updates is required
49 void cds_list_replace_rcu(struct cds_list_head
*old
, struct cds_list_head
*_new
)
51 _new
->next
= old
->next
;
52 _new
->prev
= old
->prev
;
53 rcu_assign_pointer(_new
->prev
->next
, _new
);
54 _new
->next
->prev
= _new
;
57 /* Remove element from list. */
59 void cds_list_del_rcu(struct cds_list_head
*elem
)
61 elem
->next
->prev
= elem
->prev
;
62 elem
->prev
->next
= elem
->next
;
66 * Iteration through all elements of the list must be done while rcu_read_lock()
70 /* Iterate forward over the elements of the list. */
71 #define cds_list_for_each_rcu(pos, head) \
72 for (pos = rcu_dereference((head)->next); pos != (head); \
73 pos = rcu_dereference(pos->next))
76 /* Iterate through elements of the list. */
77 #define cds_list_for_each_entry_rcu(pos, head, member) \
78 for (pos = cds_list_entry(rcu_dereference((head)->next), __typeof__(*pos), member); \
79 &pos->member != (head); \
80 pos = cds_list_entry(rcu_dereference(pos->member.next), __typeof__(*pos), member))
82 #endif /* _URCU_RCULIST_H */
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