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d3d3857f MJ |
1 | // SPDX-FileCopyrightText: Free Software Foundation, Inc. |
2 | // SPDX-FileCopyrightText: 2009 Pierre-Marc Fournier | |
3 | // SPDX-FileCopyrightText: 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
4 | // | |
5 | // SPDX-License-Identifier: LGPL-2.1-or-later | |
6 | ||
a00718e7 | 7 | /* |
a00718e7 MD |
8 | * (originally part of the GNU C Library) |
9 | * Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
a00718e7 | 10 | */ |
7a50dcf7 | 11 | |
63ff4873 MD |
12 | #ifndef _URCU_RCULIST_H |
13 | #define _URCU_RCULIST_H | |
14 | ||
15 | #include <urcu/list.h> | |
3cd243cb MD |
16 | #include <urcu/arch.h> |
17 | #include <urcu-pointer.h> | |
7a50dcf7 | 18 | |
e6decba5 MD |
19 | /* Add new element at the head of the list. */ |
20 | static inline | |
21 | void cds_list_add_rcu(struct cds_list_head *newp, struct cds_list_head *head) | |
7a50dcf7 | 22 | { |
63ff4873 MD |
23 | newp->next = head->next; |
24 | newp->prev = head; | |
63ff4873 | 25 | head->next->prev = newp; |
db757a4e | 26 | rcu_assign_pointer(head->next, newp); |
7a50dcf7 MD |
27 | } |
28 | ||
e2fcb2d3 MD |
29 | /* Add new element at the tail of the list. */ |
30 | static inline | |
31 | void cds_list_add_tail_rcu(struct cds_list_head *newp, | |
32 | struct cds_list_head *head) | |
33 | { | |
34 | newp->next = head; | |
35 | newp->prev = head->prev; | |
36 | rcu_assign_pointer(head->prev->next, newp); | |
37 | head->prev = newp; | |
38 | } | |
39 | ||
e6decba5 MD |
40 | /* |
41 | * Replace an old entry atomically with respect to concurrent RCU | |
42 | * traversal. Mutual exclusion against concurrent updates is required | |
43 | * though. | |
5db941e8 | 44 | */ |
e6decba5 MD |
45 | static inline |
46 | void cds_list_replace_rcu(struct cds_list_head *old, struct cds_list_head *_new) | |
5db941e8 MD |
47 | { |
48 | _new->next = old->next; | |
49 | _new->prev = old->prev; | |
50 | rcu_assign_pointer(_new->prev->next, _new); | |
51 | _new->next->prev = _new; | |
52 | } | |
7a50dcf7 | 53 | |
63ff4873 | 54 | /* Remove element from list. */ |
e6decba5 MD |
55 | static inline |
56 | void cds_list_del_rcu(struct cds_list_head *elem) | |
7a50dcf7 | 57 | { |
63ff4873 | 58 | elem->next->prev = elem->prev; |
db757a4e | 59 | CMM_STORE_SHARED(elem->prev->next, elem->next); |
7a50dcf7 MD |
60 | } |
61 | ||
5db941e8 MD |
62 | /* |
63 | * Iteration through all elements of the list must be done while rcu_read_lock() | |
64 | * is held. | |
65 | */ | |
66 | ||
67 | /* Iterate forward over the elements of the list. */ | |
16aa9ee8 | 68 | #define cds_list_for_each_rcu(pos, head) \ |
5e1b7c84 MD |
69 | for (pos = rcu_dereference((head)->next); (pos) != (head); \ |
70 | pos = rcu_dereference((pos)->next)) | |
7a50dcf7 | 71 | |
e6decba5 MD |
72 | /* Iterate through elements of the list. */ |
73 | #define cds_list_for_each_entry_rcu(pos, head, member) \ | |
5e1b7c84 MD |
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)) | |
7a50dcf7 | 77 | |
63ff4873 | 78 | #endif /* _URCU_RCULIST_H */ |