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/*
* Copyright (C) 2009 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* This program 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;
* version 2.1 of the License (not later!)
*
* This program 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 program; if not, see <http://www.gnu.org/licenses>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#ifndef __LIST_H
#define __LIST_H
#define offset_of(type, field) (long)(&((type *)0)->field)
#define container_of(p, type, field) (type *)((long)p - offset_of(type, field))
struct list_head {
struct list_head *next;
struct list_head *prev;
};
static inline void list_head_init(struct list_head *list)
{
list->next = list;
list->prev = list;
}
static inline void list_add(struct list_head *p, struct list_head *head)
{
struct list_head *next = head->next;
p->prev = head;
p->next = next;
next->prev = p;
head->next = p;
}
static inline void list_add_tail(struct list_head *p, struct list_head *head)
{
struct list_head *prev = head->prev;
p->prev = prev;
p->next = head;
prev->next = p;
head->prev = p;
}
static inline void list_del(struct list_head *p)
{
struct list_head *next = p->next;
struct list_head *prev = p->prev;
next->prev = prev;
prev->next = next;
}
static inline int list_empty(struct list_head *list)
{
return list->next == list;
}
#define list_for_each_entry(p, list, field) \
for (p = container_of((list)->next, typeof(*p), field); \
&(p)->field != list; \
p = container_of((p)->field.next, typeof(*p), field))
#define list_for_each_entry_safe(p, n, list, field) \
for (p = container_of((list)->next, typeof(*p), field), \
n = container_of((p)->field.next, typeof(*p), field); \
&(p)->field != list; \
p = n, n = container_of((p)->field.next, typeof(*p), field))
#endif /* __LIST_H */
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