| 1 | // SPDX-FileCopyrightText: 2002 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 | |
| 7 | /* |
| 8 | * (originally part of the GNU C Library) |
| 9 | * Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. |
| 10 | */ |
| 11 | |
| 12 | #ifndef _URCU_RCUHLIST_H |
| 13 | #define _URCU_RCUHLIST_H |
| 14 | |
| 15 | #include <urcu/hlist.h> |
| 16 | #include <urcu/arch.h> |
| 17 | #include <urcu-pointer.h> |
| 18 | |
| 19 | /* Add new element at the head of the list. */ |
| 20 | static inline |
| 21 | void cds_hlist_add_head_rcu(struct cds_hlist_node *newp, |
| 22 | struct cds_hlist_head *head) |
| 23 | { |
| 24 | newp->next = head->next; |
| 25 | newp->prev = (struct cds_hlist_node *)head; |
| 26 | if (head->next) |
| 27 | head->next->prev = newp; |
| 28 | rcu_assign_pointer(head->next, newp); |
| 29 | } |
| 30 | |
| 31 | /* Remove element from list. */ |
| 32 | static inline |
| 33 | void cds_hlist_del_rcu(struct cds_hlist_node *elem) |
| 34 | { |
| 35 | if (elem->next) |
| 36 | elem->next->prev = elem->prev; |
| 37 | CMM_STORE_SHARED(elem->prev->next, elem->next); |
| 38 | } |
| 39 | |
| 40 | /* |
| 41 | * Iterate through elements of the list. |
| 42 | * This must be done while rcu_read_lock() is held. |
| 43 | */ |
| 44 | #define cds_hlist_for_each_rcu(pos, head) \ |
| 45 | for (pos = rcu_dereference((head)->next); (pos) != NULL; \ |
| 46 | pos = rcu_dereference((pos)->next)) |
| 47 | |
| 48 | /* |
| 49 | * cds_hlist_for_each_entry_rcu takes 4 arguments, while the Linux |
| 50 | * kernel API only takes 3. |
| 51 | * We implement cds_hlist_for_each_entry_rcu_2() to follow the Linux |
| 52 | * kernel APIs. |
| 53 | */ |
| 54 | #define cds_hlist_for_each_entry_rcu(entry, pos, head, member) \ |
| 55 | for (pos = rcu_dereference((head)->next), \ |
| 56 | entry = cds_hlist_entry(pos, __typeof__(*(entry)), member); \ |
| 57 | (pos) != NULL; \ |
| 58 | pos = rcu_dereference((pos)->next), \ |
| 59 | entry = cds_hlist_entry(pos, __typeof__(*(entry)), member)) |
| 60 | |
| 61 | #define cds_hlist_for_each_entry_rcu_2(entry, head, member) \ |
| 62 | for (entry = cds_hlist_entry_safe(rcu_dereference((head)->next), \ |
| 63 | __typeof__(*(entry)), member); \ |
| 64 | (entry) != NULL; \ |
| 65 | entry = cds_hlist_entry_safe(rcu_dereference((entry)->member.next), \ |
| 66 | __typeof__(*(entry)), member)) |
| 67 | |
| 68 | #endif /* _URCU_RCUHLIST_H */ |