1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #ifndef _NGX_RBTREE_H_INCLUDED_
8 #define _NGX_RBTREE_H_INCLUDED_
9
10
11 #include <ngx_config.h>
12 #include <ngx_core.h>
13
14
15 typedef ngx_uint_t ngx_rbtree_key_t;
16 typedef ngx_int_t ngx_rbtree_key_int_t;
17
18
19 typedef struct ngx_rbtree_node_s ngx_rbtree_node_t;
20
21 struct ngx_rbtree_node_s {
22 ngx_rbtree_key_t key;
23 ngx_rbtree_node_t *left;
24 ngx_rbtree_node_t *right;
25 ngx_rbtree_node_t *parent;
26 u_char color;
27 u_char data;
28 };
29
30
31 typedef struct ngx_rbtree_s ngx_rbtree_t;
32
33 typedef void (*ngx_rbtree_insert_pt) (ngx_rbtree_node_t *root,
34 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
35
36 struct ngx_rbtree_s {
37 ngx_rbtree_node_t *root;
38 ngx_rbtree_node_t *sentinel;
39 ngx_rbtree_insert_pt insert;
40 };
41
42
43 #define ngx_rbtree_init(tree, s, i) \
44 ngx_rbtree_sentinel_init(s); \
45 (tree)->root = s; \
46 (tree)->sentinel = s; \
47 (tree)->insert = i
48
49
50 void ngx_rbtree_insert(ngx_thread_volatile ngx_rbtree_t *tree,
51 ngx_rbtree_node_t *node);
52 void ngx_rbtree_delete(ngx_thread_volatile ngx_rbtree_t *tree,
53 ngx_rbtree_node_t *node);
54 void ngx_rbtree_insert_value(ngx_rbtree_node_t *root, ngx_rbtree_node_t *node,
55 ngx_rbtree_node_t *sentinel);
56 void ngx_rbtree_insert_timer_value(ngx_rbtree_node_t *root,
57 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
58
59
60 #define ngx_rbt_red(node) ((node)->color = 1)
61 #define ngx_rbt_black(node) ((node)->color = 0)
62 #define ngx_rbt_is_red(node) ((node)->color)
63 #define ngx_rbt_is_black(node) (!ngx_rbt_is_red(node))
64 #define ngx_rbt_copy_color(n1, n2) (n1->color = n2->color)
65
66
67 /* a sentinel must be black */
68
69 #define ngx_rbtree_sentinel_init(node) ngx_rbt_black(node)
70
71
72 static ngx_inline ngx_rbtree_node_t *
73 ngx_rbtree_min(ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
74 {
75 while (node->left != sentinel) {
76 node = node->left;
77 }
78
79 return node;
80 }
81
82
83 #endif /* _NGX_RBTREE_H_INCLUDED_ */
84
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