--- /dev/null
+/*
+ * Copyright (C) 2002 Free Software Foundation, Inc.
+ * (originally part of the GNU C Library)
+ * Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+ *
+ * Copyright (C) 2009 Pierre-Marc Fournier
+ * Conversion to RCU list.
+ * Copyright (C) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef _CDS_LIST_H
+#define _CDS_LIST_H 1
+
+/*
+ * The definitions of this file are adopted from those which can be
+ * found in the Linux kernel headers to enable people familiar with the
+ * latter find their way in these sources as well.
+ */
+
+/* Basic type for the double-link list. */
+struct cds_list_head {
+ struct cds_list_head *next, *prev;
+};
+
+/* Define a variable with the head and tail of the list. */
+#define CDS_LIST_HEAD(name) \
+ struct cds_list_head name = { &(name), &(name) }
+
+/* Initialize a new list head. */
+#define CDS_INIT_LIST_HEAD(ptr) \
+ (ptr)->next = (ptr)->prev = (ptr)
+
+#define CDS_LIST_HEAD_INIT(name) { .prev = &(name), .next = &(name) }
+
+/* Add new element at the head of the list. */
+static inline
+void cds_list_add(struct cds_list_head *newp, struct cds_list_head *head)
+{
+ head->next->prev = newp;
+ newp->next = head->next;
+ newp->prev = head;
+ head->next = newp;
+}
+
+/* Add new element at the tail of the list. */
+static inline
+void cds_list_add_tail(struct cds_list_head *newp, struct cds_list_head *head)
+{
+ head->prev->next = newp;
+ newp->next = head;
+ newp->prev = head->prev;
+ head->prev = newp;
+}
+
+/* Remove element from list. */
+static inline
+void __cds_list_del(struct cds_list_head *prev, struct cds_list_head *next)
+{
+ next->prev = prev;
+ prev->next = next;
+}
+
+/* Remove element from list. */
+static inline
+void cds_list_del(struct cds_list_head *elem)
+{
+ __cds_list_del(elem->prev, elem->next);
+}
+
+/* Remove element from list, initializing the element's list pointers. */
+static inline
+void cds_list_del_init(struct cds_list_head *elem)
+{
+ cds_list_del(elem);
+ CDS_INIT_LIST_HEAD(elem);
+}
+
+/* Delete from list, add to another list as head. */
+static inline
+void cds_list_move(struct cds_list_head *elem, struct cds_list_head *head)
+{
+ __cds_list_del(elem->prev, elem->next);
+ cds_list_add(elem, head);
+}
+
+/* Replace an old entry. */
+static inline
+void cds_list_replace(struct cds_list_head *old, struct cds_list_head *_new)
+{
+ _new->next = old->next;
+ _new->prev = old->prev;
+ _new->prev->next = _new;
+ _new->next->prev = _new;
+}
+
+/* Join two lists. */
+static inline
+void cds_list_splice(struct cds_list_head *add, struct cds_list_head *head)
+{
+ /* Do nothing if the list which gets added is empty. */
+ if (add != add->next) {
+ add->next->prev = head;
+ add->prev->next = head->next;
+ head->next->prev = add->prev;
+ head->next = add->next;
+ }
+}
+
+/* Get typed element from list at a given position. */
+#define cds_list_entry(ptr, type, member) \
+ ((type *) ((char *) (ptr) - (unsigned long) (&((type *) 0)->member)))
+
+
+/* Get first entry from a list. */
+#define cds_list_first_entry(ptr, type, member) \
+ cds_list_entry((ptr)->next, type, member)
+
+/* Iterate forward over the elements of the list. */
+#define cds_list_for_each(pos, head) \
+ for (pos = (head)->next; pos != (head); pos = pos->next)
+
+/*
+ * Iterate forward over the elements list. The list elements can be
+ * removed from the list while doing this.
+ */
+#define cds_list_for_each_safe(pos, p, head) \
+ for (pos = (head)->next, p = pos->next; \
+ pos != (head); \
+ pos = p, p = pos->next)
+
+/* Iterate backward over the elements of the list. */
+#define cds_list_for_each_prev(pos, head) \
+ for (pos = (head)->prev; pos != (head); pos = pos->prev)
+
+/*
+ * Iterate backwards over the elements list. The list elements can be
+ * removed from the list while doing this.
+ */
+#define cds_list_for_each_prev_safe(pos, p, head) \
+ for (pos = (head)->prev, p = pos->prev; \
+ pos != (head); \
+ pos = p, p = pos->prev)
+
+#define cds_list_for_each_entry(pos, head, member) \
+ for (pos = cds_list_entry((head)->next, __typeof__(*pos), member); \
+ &pos->member != (head); \
+ pos = cds_list_entry(pos->member.next, __typeof__(*pos), member))
+
+#define cds_list_for_each_entry_reverse(pos, head, member) \
+ for (pos = cds_list_entry((head)->prev, __typeof__(*pos), member); \
+ &pos->member != (head); \
+ pos = cds_list_entry(pos->member.prev, __typeof__(*pos), member))
+
+#define cds_list_for_each_entry_safe(pos, p, head, member) \
+ for (pos = cds_list_entry((head)->next, __typeof__(*pos), member), \
+ p = cds_list_entry(pos->member.next, __typeof__(*pos), member); \
+ &pos->member != (head); \
+ pos = p, p = cds_list_entry(pos->member.next, __typeof__(*pos), member))
+
+/*
+ * Same as cds_list_for_each_entry_safe, but starts from "pos" which should
+ * point to an entry within the list.
+ */
+#define cds_list_for_each_entry_safe_from(pos, p, head, member) \
+ for (p = cds_list_entry(pos->member.next, __typeof__(*pos), member); \
+ &pos->member != (head); \
+ pos = p, p = cds_list_entry(pos->member.next, __typeof__(*pos), member))
+
+static inline
+int cds_list_empty(struct cds_list_head *head)
+{
+ return head == head->next;
+}
+
+static inline
+void cds_list_replace_init(struct cds_list_head *old,
+ struct cds_list_head *_new)
+{
+ struct cds_list_head *head = old->next;
+
+ cds_list_del(old);
+ cds_list_add_tail(_new, head);
+ CDS_INIT_LIST_HEAD(old);
+}
+
+#endif /* _CDS_LIST_H */
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