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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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7
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8 #ifndef _NGX_RBTREE_H_INCLUDED_
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9 #define _NGX_RBTREE_H_INCLUDED_
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10
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11
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12 #include <ngx_config.h>
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13 #include <ngx_core.h>
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14
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15
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106
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16 typedef ngx_uint_t ngx_rbtree_key_t;
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17 typedef ngx_int_t ngx_rbtree_key_int_t;
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18
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19
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108
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20 typedef struct ngx_rbtree_node_s ngx_rbtree_node_t;
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0
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21
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108
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22 struct ngx_rbtree_node_s {
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23 ngx_rbtree_key_t key;
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24 ngx_rbtree_node_t *left;
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25 ngx_rbtree_node_t *right;
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26 ngx_rbtree_node_t *parent;
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258
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27 u_char color;
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28 u_char data;
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0
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29 };
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30
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31
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108
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32 typedef struct ngx_rbtree_s ngx_rbtree_t;
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33
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258
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34 typedef void (*ngx_rbtree_insert_pt) (ngx_rbtree_node_t *root,
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108
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35 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
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36
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37 struct ngx_rbtree_s {
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38 ngx_rbtree_node_t *root;
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39 ngx_rbtree_node_t *sentinel;
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258
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40 ngx_rbtree_insert_pt insert;
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108
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41 };
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0
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42
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43
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354
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44 #define ngx_rbtree_init(tree, s, i) \
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45 ngx_rbtree_sentinel_init(s); \
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46 (tree)->root = s; \
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47 (tree)->sentinel = s; \
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48 (tree)->insert = i
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49
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50
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108
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51 void ngx_rbtree_insert(ngx_thread_volatile ngx_rbtree_t *tree,
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52 ngx_rbtree_node_t *node);
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53 void ngx_rbtree_delete(ngx_thread_volatile ngx_rbtree_t *tree,
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54 ngx_rbtree_node_t *node);
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258
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55 void ngx_rbtree_insert_value(ngx_rbtree_node_t *root, ngx_rbtree_node_t *node,
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56 ngx_rbtree_node_t *sentinel);
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57 void ngx_rbtree_insert_timer_value(ngx_rbtree_node_t *root,
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58 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
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108
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59
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60
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274
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61 #define ngx_rbt_red(node) ((node)->color = 1)
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62 #define ngx_rbt_black(node) ((node)->color = 0)
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63 #define ngx_rbt_is_red(node) ((node)->color)
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64 #define ngx_rbt_is_black(node) (!ngx_rbt_is_red(node))
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65 #define ngx_rbt_copy_color(n1, n2) (n1->color = n2->color)
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66
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67
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272
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68 /* a sentinel must be black */
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69
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274
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70 #define ngx_rbtree_sentinel_init(node) ngx_rbt_black(node)
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272
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71
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72
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108
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73 static ngx_inline ngx_rbtree_node_t *
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74 ngx_rbtree_min(ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
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0
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75 {
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106
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76 while (node->left != sentinel) {
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77 node = node->left;
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78 }
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0
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79
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106
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80 return node;
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0
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81 }
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82
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83
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84 #endif /* _NGX_RBTREE_H_INCLUDED_ */
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