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include/linux/prio_tree.h
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Linux-2.6.12-rc2
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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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