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Jens Axboeb65c7ec2012-03-21 17:17:45 +01001#ifndef _LINUX_PRIO_TREE_H
2#define _LINUX_PRIO_TREE_H
3
4#include <inttypes.h>
5#include "../hash.h"
6
7struct prio_tree_node {
8 struct prio_tree_node *left;
9 struct prio_tree_node *right;
10 struct prio_tree_node *parent;
11 uint64_t start;
12 uint64_t last; /* last location _in_ interval */
13};
14
15struct prio_tree_root {
16 struct prio_tree_node *prio_tree_node;
17 unsigned short index_bits;
18};
19
20struct prio_tree_iter {
21 struct prio_tree_node *cur;
22 unsigned long mask;
23 unsigned long value;
24 int size_level;
25
26 struct prio_tree_root *root;
27 uint64_t r_index;
28 uint64_t h_index;
29};
30
31static inline void prio_tree_iter_init(struct prio_tree_iter *iter,
32 struct prio_tree_root *root, uint64_t r_index, uint64_t h_index)
33{
34 iter->root = root;
35 iter->r_index = r_index;
36 iter->h_index = h_index;
37 iter->cur = NULL;
38}
39
40#define INIT_PRIO_TREE_ROOT(ptr) \
41do { \
42 (ptr)->prio_tree_node = NULL; \
43 (ptr)->index_bits = 1; \
44} while (0)
45
46#define INIT_PRIO_TREE_NODE(ptr) \
47do { \
48 (ptr)->left = (ptr)->right = (ptr)->parent = (ptr); \
49} while (0)
50
51#define INIT_PRIO_TREE_ITER(ptr) \
52do { \
53 (ptr)->cur = NULL; \
54 (ptr)->mask = 0UL; \
55 (ptr)->value = 0UL; \
56 (ptr)->size_level = 0; \
57} while (0)
58
59#define prio_tree_entry(ptr, type, member) \
60 ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
61
62static inline int prio_tree_empty(const struct prio_tree_root *root)
63{
64 return root->prio_tree_node == NULL;
65}
66
67static inline int prio_tree_root(const struct prio_tree_node *node)
68{
69 return node->parent == node;
70}
71
72static inline int prio_tree_left_empty(const struct prio_tree_node *node)
73{
74 return node->left == node;
75}
76
77static inline int prio_tree_right_empty(const struct prio_tree_node *node)
78{
79 return node->right == node;
80}
81
82
83struct prio_tree_node *prio_tree_replace(struct prio_tree_root *root,
84 struct prio_tree_node *old, struct prio_tree_node *node);
85struct prio_tree_node *prio_tree_insert(struct prio_tree_root *root,
86 struct prio_tree_node *node);
87void prio_tree_remove(struct prio_tree_root *root, struct prio_tree_node *node);
88struct prio_tree_node *prio_tree_next(struct prio_tree_iter *iter);
89
90#endif /* _LINUX_PRIO_TREE_H */