| 0,0 → 1,110 |
|---|
| /* |
| * Copyright (c) 2004 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** @addtogroup genericadt |
| * @{ |
| */ |
| |
| /** |
| * @file listrcu.c |
| * @brief Functions completing doubly linked circular list protected by RCU implementation. |
| * |
| * This file contains some of the functions implementing doubly linked circular lists. |
| * Note that the implementation doesn't differ much as when traversing the list we use only next pointers. So changes can be considered atomic. |
| * However, this ADT is mostly implemented in @ref list.h and @ref listrcu.h. |
| */ |
| |
| #include <adt/list.h> |
| #include <adt/listrcu.h> |
| #include <synch/rcu.h> |
| |
| /** Check for membership |
| * |
| * Check whether link is contained in the list head. |
| * The membership is defined as pointer equivalence. |
| * |
| * @param link Item to look for. |
| * @param head List to look in. |
| * |
| * @return true if link is contained in head, false otherwise. |
| * |
| */ |
| bool list_member_rcu(const link_t *link, const link_t *head) |
| { |
| bool found = false; |
| rcu_read_lock(); |
| link_t *hlp = rcu_dereference_pointer(head).next; |
| |
| while (hlp != head) { |
| if (hlp == link) { |
| found = true; |
| break; |
| } |
| hlp = rcu_dereference_pointer(hlp).next; |
| } |
| rcu_read_lock(); |
| |
| return found; |
| } |
| |
| |
| /** Concatenate two lists |
| * |
| * Concatenate lists head1 and head2, producing a single |
| * list head1 containing items from both (in head1, head2 |
| * order) and empty list head2. |
| * |
| * @param head1 First list and concatenated output |
| * @param head2 Second list and empty output. |
| * |
| */ |
| void list_concat_rcu(link_t *head1, link_t *head2) |
| { |
| if (list_empty(head2)) |
| return; |
| |
| head2->next->prev = head1->prev; |
| rcu_assign_pointer(head2->prev->next, head1); |
| rcu_assign_pointer(head1->prev->next, head2->next); |
| head1->prev = head2->prev; |
| list_initialize(head2); |
| } |
| |
| /** Copy the link structure */ |
| void copy_link_rcu(link_t * src, link_t* dest) |
| { |
| dest->next = src->next; |
| if (dest->next) |
| dest->next->prev = dest; |
| dest->prev = src->prev; |
| if (dest->prev) |
| dest->prev->next = dest; |
| } |
| |
| /** @} |
| */ |