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#ifndef _LINUX_PRIO_TREE_H

#define _LINUX_PRIO_TREE_H

/*

 * K&R 2nd ed. A8.3 somewhat obliquely hints that initial sequences of struct

 * fields with identical types should end up at the same location. We'll use

 * this until we can scrap struct raw_prio_tree_node.

 *

 * Note: all this could be done more elegantly by using unnamed union/struct

 * fields. However, gcc 2.95.3 and apparently also gcc 3.0.4 don't support this

 * language extension.

 */

struct raw_prio_tree_node {

        struct prio_tree_node   *left;

        struct prio_tree_node   *right;

        struct prio_tree_node   *parent;

};

struct prio_tree_node {

        struct prio_tree_node   *left;

        struct prio_tree_node   *right;

        struct prio_tree_node   *parent;

        unsigned long           start;

        unsigned long           last;   /* last location _in_ interval */

};

struct prio_tree_root {

        struct prio_tree_node   *prio_tree_node;

        unsigned short          index_bits;

        unsigned short          raw;

                /*

                 * 0: nodes are of type struct prio_tree_node

                 * 1: nodes are of type raw_prio_tree_node

                 */

};

struct prio_tree_iter {

        struct prio_tree_node   *cur;

        unsigned long           mask;

        unsigned long           value;

        int                     size_level;

        struct prio_tree_root   *root;

        pgoff_t                 r_index;

        pgoff_t                 h_index;

};

static inline void prio_tree_iter_init(struct prio_tree_iter *iter,

                struct prio_tree_root *root, pgoff_t r_index, pgoff_t h_index)

{

        iter->root = root;

        iter->r_index = r_index;

        iter->h_index = h_index;

        iter->cur = NULL;

}

#define __INIT_PRIO_TREE_ROOT(ptr, _raw)        \

do {                                    \

        (ptr)->prio_tree_node = NULL;   \

        (ptr)->index_bits = 1;          \

        (ptr)->raw = (_raw);            \

} while (0)

#define INIT_PRIO_TREE_ROOT(ptr)        __INIT_PRIO_TREE_ROOT(ptr, 0)

#define INIT_RAW_PRIO_TREE_ROOT(ptr)    __INIT_PRIO_TREE_ROOT(ptr, 1)

#define INIT_PRIO_TREE_NODE(ptr)                                \

do {                                                            \

        (ptr)->left = (ptr)->right = (ptr)->parent = (ptr);     \

} while (0)

#define INIT_PRIO_TREE_ITER(ptr)        \

do {                                    \

        (ptr)->cur = NULL;              \

        (ptr)->mask = 0UL;              \

        (ptr)->value = 0UL;             \

        (ptr)->size_level = 0;           \

} while (0)

#define prio_tree_entry(ptr, type, member) \

       ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))

static inline int prio_tree_empty(const struct prio_tree_root *root)

{

        return root->prio_tree_node == NULL;

}

static inline int prio_tree_root(const struct prio_tree_node *node)

{

        return node->parent == node;

}

static inline int prio_tree_left_empty(const struct prio_tree_node *node)

{

        return node->left == node;

}

static inline int prio_tree_right_empty(const struct prio_tree_node *node)

{

        return node->right == node;

}

struct prio_tree_node *prio_tree_replace(struct prio_tree_root *root,

                struct prio_tree_node *old, struct prio_tree_node *node);

struct prio_tree_node *prio_tree_insert(struct prio_tree_root *root,

                struct prio_tree_node *node);

void prio_tree_remove(struct prio_tree_root *root, struct prio_tree_node *node);

struct prio_tree_node *prio_tree_next(struct prio_tree_iter *iter);

#define raw_prio_tree_replace(root, old, node) \

        prio_tree_replace(root, (struct prio_tree_node *) (old), \

            (struct prio_tree_node *) (node))

#define raw_prio_tree_insert(root, node) \

        prio_tree_insert(root, (struct prio_tree_node *) (node))

#define raw_prio_tree_remove(root, node) \

        prio_tree_remove(root, (struct prio_tree_node *) (node))

#endif /* _LINUX_PRIO_TREE_H */