| 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 | static inline |
| 34 | 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 | if (head->next) |
| 40 | head->next->prev = newp; |
| 41 | rcu_assign_pointer(head->next, newp); |
| 42 | } |
| 43 | |
| 44 | /* Remove element from list. */ |
| 45 | static inline |
| 46 | void cds_hlist_del_rcu(struct cds_hlist_node *elem) |
| 47 | { |
| 48 | if (elem->next) |
| 49 | elem->next->prev = elem->prev; |
| 50 | CMM_STORE_SHARED(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 | #define cds_hlist_for_each_rcu(pos, head) \ |
| 58 | for (pos = rcu_dereference((head)->next); pos != NULL; \ |
| 59 | pos = rcu_dereference(pos->next)) |
| 60 | |
| 61 | /* |
| 62 | * cds_hlist_for_each_entry_rcu takes 4 arguments, while the Linux |
| 63 | * kernel API only takes 3. |
| 64 | * We implement cds_hlist_for_each_entry_rcu_2() to follow the Linux |
| 65 | * kernel APIs. |
| 66 | */ |
| 67 | #define cds_hlist_for_each_entry_rcu(entry, pos, head, member) \ |
| 68 | for (pos = rcu_dereference((head)->next), \ |
| 69 | entry = cds_hlist_entry(pos, __typeof__(*entry), member); \ |
| 70 | pos != NULL; \ |
| 71 | pos = rcu_dereference(pos->next), \ |
| 72 | entry = cds_hlist_entry(pos, __typeof__(*entry), member)) |
| 73 | |
| 74 | #define cds_hlist_for_each_entry_rcu_2(entry, head, member) \ |
| 75 | for (entry = cds_hlist_entry(rcu_dereference((head)->next), \ |
| 76 | __typeof__(*entry), member); \ |
| 77 | &entry->member != NULL; \ |
| 78 | entry = cds_hlist_entry(rcu_dereference(entry->member.next), \ |
| 79 | __typeof__(*entry), member)) |
| 80 | |
| 81 | #endif /* _URCU_RCUHLIST_H */ |