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.
5 Copyright (C) 2009 Pierre-Marc Fournier
6 Conversion to RCU list.
7 Copyright (C) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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.
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.
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
24 #ifndef _URCU_RCULIST_H
25 #define _URCU_RCULIST_H
27 #include <urcu/list.h>
28 #include <urcu/arch.h>
29 #include <urcu-pointer.h>
31 /* Add new element at the head of the list.
33 static inline void cds_list_add_rcu(struct cds_list_head
*newp
, struct cds_list_head
*head
)
35 newp
->next
= head
->next
;
38 head
->next
->prev
= newp
;
42 /* replace an old entry atomically.
44 static inline void cds_list_replace_rcu(struct cds_list_head
*old
, struct cds_list_head
*_new
)
46 _new
->next
= old
->next
;
47 _new
->prev
= old
->prev
;
48 rcu_assign_pointer(_new
->prev
->next
, _new
);
49 _new
->next
->prev
= _new
;
52 /* Remove element from list. */
53 static inline void cds_list_del_rcu(struct cds_list_head
*elem
)
55 elem
->next
->prev
= elem
->prev
;
56 elem
->prev
->next
= elem
->next
;
60 * Iteration through all elements of the list must be done while rcu_read_lock()
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))
70 /* Iterate through elements of the list.
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))
77 #endif /* _URCU_RCULIST_H */
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