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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 */
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