list.h

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#ifndef __LIST_H
#define __LIST_H
/* from Linux kernel */
 
/* This file is from Linux Kernel (include/linux/list.h)
 * and modified by simply removing hardware prefetching of list items.
 * Here by copyright, credits attributed to wherever they belong.
 * Kulesh Shanmugasundaram (kulesh [squiggly] isis.poly.edu)
 */
 
/*
 * 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 = 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!
 */
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;
}
 
static inline void list_add(struct list_head *new, struct list_head *head)
{
        __list_add(new, head, head->next);
}
 
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);
        entry->next = (void *) 0x1010;
        entry->prev = (void *) 0x1010;
}
 
static inline void list_del_init(struct list_head *entry)
{
        __list_del(entry->prev, entry->next);
        INIT_LIST_HEAD(entry);
}
 
static inline void list_move(struct list_head *list, struct list_head *head)
{
        __list_del(list->prev, list->next);
        list_add(list, head);
}
 
static inline void list_move_tail(struct list_head *list,
                                  struct list_head *head)
{
        __list_del(list->prev, list->next);
        list_add_tail(list, head);
}
 
static inline int list_empty(struct list_head *head)
{
        return head->next == head;
}
 
static inline void __list_splice(struct list_head *list,
                                 struct list_head *head)
{
        struct list_head *first = list->next;
        struct list_head *last = list->prev;
        struct list_head *at = head->next;
 
        first->prev = head;
        head->next = first;
 
        last->next = at;
        at->prev = last;
}
 
static inline void list_splice(struct list_head *list, struct list_head *head)
{
        if (!list_empty(list))
                __list_splice(list, head);
}
 
static inline void list_splice_init(struct list_head *list,
                                    struct list_head *head)
{
        if (!list_empty(list)) {
                __list_splice(list, head);
                INIT_LIST_HEAD(list);
        }
}
 
#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)
 
#define list_for_each_prev(pos, head) \
        for (pos = (head)->prev; pos != (head); \
                pos = pos->prev)
 
#define list_for_each_safe(pos, n, head) \
        for (pos = (head)->next, n = pos->next; pos != (head); \
                pos = n, n = pos->next)
 
#define list_for_each_entry(pos, head, member)              \
        for (pos = list_entry((head)->next, typeof(*pos), member);  \
             &pos->member != (head);                                    \
             pos = list_entry(pos->member.next, typeof(*pos), member))
 
#define list_for_each_entry_safe(pos, n, head, member)          \
        for (pos = list_entry((head)->next, typeof(*pos), member),  \
                n = list_entry(pos->member.next, typeof(*pos), member); \
             &pos->member != (head);                                    \
             pos = n, n = list_entry(n->member.next, typeof(*n), member))
 
 
#endif