lfstack: implement test
[urcu.git] / urcu / rcuhlist.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_RCUHLIST_H
26 #define _URCU_RCUHLIST_H
27
28 #include <urcu/hlist.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_hlist_add_head_rcu(struct cds_hlist_node *newp,
35 struct cds_hlist_head *head)
36 {
37 newp->next = head->next;
38 newp->prev = (struct cds_hlist_node *)head;
39 cmm_smp_wmb();
40 if (head->next)
41 head->next->prev = newp;
42 head->next = newp;
43 }
44
45 /* Remove element from list. */
46 static inline void cds_hlist_del_rcu(struct cds_hlist_node *elem)
47 {
48 if (elem->next)
49 elem->next->prev = elem->prev;
50 elem->prev->next = elem->next;
51 }
52
53
54 /* Iterate through elements of the list.
55 * This must be done while rcu_read_lock() is held.
56 */
57
58 #define cds_hlist_for_each_entry_rcu(entry, pos, head, member) \
59 for (pos = rcu_dereference((head)->next), \
60 entry = cds_hlist_entry(pos, __typeof__(*entry), member); \
61 pos != NULL; \
62 pos = rcu_dereference(pos->next), \
63 entry = cds_hlist_entry(pos, __typeof__(*entry), member))
64
65 #endif /* _URCU_RCUHLIST_H */
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