prio_tree.h
上传用户:szlgq88
上传日期:2009-04-28
资源大小:48287k
文件大小:3k
- #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 */