114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
/* vi: set sw=4 ts=4: */
|
|
#ifndef _LINUX_LIST_H
|
|
#define _LINUX_LIST_H
|
|
|
|
/*
|
|
* Simple doubly linked list implementation.
|
|
*
|
|
* Some of the internal functions ("__xxx") are useful when
|
|
* manipulating whole lists rather than single entries, as
|
|
* sometimes we already know the next/prev entries and we can
|
|
* generate better code by using them directly rather than
|
|
* using the generic single-entry routines.
|
|
*/
|
|
|
|
struct list_head {
|
|
struct list_head *next, *prev;
|
|
};
|
|
|
|
#define LIST_HEAD_INIT(name) { &(name), &(name) }
|
|
|
|
#define LIST_HEAD(name) \
|
|
struct list_head name = { &name, &name }
|
|
|
|
#define INIT_LIST_HEAD(ptr) do { \
|
|
(ptr)->next = (ptr); (ptr)->prev = (ptr); \
|
|
} while (0)
|
|
|
|
#if (!defined(__GNUC__) && !defined(__WATCOMC__))
|
|
#define __inline__
|
|
#endif
|
|
|
|
/*
|
|
* Insert a new entry between two known consecutive entries.
|
|
*
|
|
* This is only for internal list manipulation where we know
|
|
* the prev/next entries already!
|
|
*/
|
|
static __inline__ void __list_add(struct list_head * new,
|
|
struct list_head * prev,
|
|
struct list_head * next)
|
|
{
|
|
next->prev = new;
|
|
new->next = next;
|
|
new->prev = prev;
|
|
prev->next = new;
|
|
}
|
|
|
|
/*
|
|
* Insert a new entry after the specified head..
|
|
*/
|
|
static __inline__ void list_add(struct list_head *new, struct list_head *head)
|
|
{
|
|
__list_add(new, head, head->next);
|
|
}
|
|
|
|
/*
|
|
* Insert a new entry at the tail
|
|
*/
|
|
static __inline__ void list_add_tail(struct list_head *new, struct list_head *head)
|
|
{
|
|
__list_add(new, head->prev, head);
|
|
}
|
|
|
|
/*
|
|
* Delete a list entry by making the prev/next entries
|
|
* point to each other.
|
|
*
|
|
* This is only for internal list manipulation where we know
|
|
* the prev/next entries already!
|
|
*/
|
|
static __inline__ void __list_del(struct list_head * prev,
|
|
struct list_head * next)
|
|
{
|
|
next->prev = prev;
|
|
prev->next = next;
|
|
}
|
|
|
|
static __inline__ void list_del(struct list_head *entry)
|
|
{
|
|
__list_del(entry->prev, entry->next);
|
|
}
|
|
|
|
static __inline__ int list_empty(struct list_head *head)
|
|
{
|
|
return head->next == head;
|
|
}
|
|
|
|
/*
|
|
* Splice in "list" into "head"
|
|
*/
|
|
static __inline__ void list_splice(struct list_head *list, struct list_head *head)
|
|
{
|
|
struct list_head *first = list->next;
|
|
|
|
if (first != list) {
|
|
struct list_head *last = list->prev;
|
|
struct list_head *at = head->next;
|
|
|
|
first->prev = head;
|
|
head->next = first;
|
|
|
|
last->next = at;
|
|
at->prev = last;
|
|
}
|
|
}
|
|
|
|
#define list_entry(ptr, type, member) \
|
|
((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
|
|
|
|
#define list_for_each(pos, head) \
|
|
for (pos = (head)->next; pos != (head); pos = pos->next)
|
|
|
|
#endif
|