list.h

国家ASIC工程中心使用的嵌入式操作系统

#ifndef _FS_LIST_H
#define _FS_LIST_H

#define __inline__

/*
 * 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.
 */

typedef struct list_head {
	struct list_head *next, *prev;
}DLIST_S;

#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)

/*
 * 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)

/*
 * While node will be deleted from list during circle-search the list
 */
#define special_list_for_each(pos, head) \
        for (pos = (head)->next; pos != (head); pos = (head)->next)

/*add by Julias*/
#define list_move_to_head(pos, head) do { \
		(pos)->prev->next = (pos)->next;\
		(pos)->next->prev = (pos)->prev;\
		(head)->next->prev = (pos);\
		(pos)->next = (head)->next;\
		(head)->next = (pos);\
		(pos)->prev = (head);\
}while(0)

//#define list_only_one( head )\
//	(head)->prev == (head)->next ? 1 : 0

#endif /*_FS_LIST_H*/