/* * (c) 2001 Gerd Knorr <kraxel@bytesex.org> *	Modified by:	PengJieJun,2003.7.11 * */#ifndef _LIST_H#define _LIST_H 1/* * Simple doubly linked list implementation. *	-- shameless stolen from the linux kernel sources * * 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 = LIST_HEAD_INIT(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! *///penjiejun 2003.07.11//對g++編譯器,將變量new修改為new_ptrstatic __inline__ void __list_add(struct list_head * new_ptr,	struct list_head * prev,	struct list_head * next){	next->prev = new_ptr;	new_ptr->next = next;	new_ptr->prev = prev;	prev->next = new_ptr;}/** * list_add - add a new entry * @new: new entry to be added * @head: list head to add it after * * Insert a new entry after the specified head. * This is good for implementing stacks. */static __inline__ void list_add(struct list_head *new_ptr, struct list_head *head){	__list_add(new_ptr, head, head->next);}/** * list_add_tail - add a new entry * @new: new entry to be added * @head: list head to add it before * * Insert a new entry before the specified head. * This is useful for implementing queues. */static __inline__ void list_add_tail(struct list_head *new_ptr, struct list_head *head){	__list_add(new_ptr, 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;}/** * list_del - deletes entry from list. * @entry: the element to delete from the list. * Note: list_empty on entry does not return true after this, the entry is in an undefined state. */static __inline__ void list_del(struct list_head *entry){	__list_del(entry->prev, entry->next);}/** * list_del_init - deletes entry from list and reinitialize it. * @entry: the element to delete from the list. */static __inline__ void list_del_init(struct list_head *entry){	__list_del(entry->prev, entry->next);	INIT_LIST_HEAD(entry); }/** * list_empty - tests whether a list is empty * @head: the list to test. */static __inline__ int list_empty(struct list_head *head){	return head->next == head;}/** * list_splice - join two lists * @list: the new list to add. * @head: the place to add it in the first list. */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;	}}/** * list_entry - get the struct for this entry * @ptr:	the &struct list_head pointer. * @type:	the type of the struct this is embedded in. * @member:	the name of the list_struct within the struct. */#define list_entry(ptr, type, member) \	((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))/** * list_for_each	-	iterate over a list * @pos:	the &struct list_head to use as a loop counter. * @head:	the head for your list. */#define list_for_each(pos, head) \	for (pos = (head)->next; pos != (head); pos = pos->next)        	/** * list_for_each_safe	-	iterate over a list safe against removal of list entry * @pos:	the &struct list_head to use as a loop counter. * @n:		another &struct list_head to use as temporary storage * @head:	the head for your list. */#define list_for_each_safe(pos, n, head) \	for (pos = (head)->next, n = pos->next; pos != (head); \		pos = n, n = pos->next)/** * list_for_each_prev	-	iterate over a list in reverse order * @pos:	the &struct list_head to use as a loop counter. * @head:	the head for your list. */#define list_for_each_prev(pos, head) \	for (pos = (head)->prev; pos != (head); pos = pos->prev)#endif /* _LIST_H */