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src/core/ngx_rbtree.h - nginx-1.7.10

Data types defined

Functions defined

Macros defined

Source code


  2. /*
  3. * Copyright (C) Igor Sysoev
  4. * Copyright (C) Nginx, Inc.
  5. */


  8. #ifndef _NGX_RBTREE_H_INCLUDED_
  9. ‌#define _NGX_RBTREE_H_INCLUDED_


  12. #include <ngx_config.h>
  13. #include <ngx_core.h>


  16. ‌typedef ngx_uint_t  ngx_rbtree_key_t;
  17. ‌typedef ngx_int_t   ngx_rbtree_key_int_t;


  20. ‌typedef struct ngx_rbtree_node_s  ngx_rbtree_node_t;

  22. ‌struct ngx_rbtree_node_s {
  23.     ngx_rbtree_key_t       key;
  24.     ngx_rbtree_node_t     *left;
  25.     ngx_rbtree_node_t     *right;
  26.     ngx_rbtree_node_t     *parent;
  27.     u_char                 color;
  28.     u_char                 data;
  29. };


  32. ‌typedef struct ngx_rbtree_s  ngx_rbtree_t;

  34. ‌typedef void (*ngx_rbtree_insert_pt) (ngx_rbtree_node_t *root,
  35.     ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);

  37. ‌struct ngx_rbtree_s {
  38.     ngx_rbtree_node_t     *root;
  39.     ngx_rbtree_node_t     *sentinel;
  40.     ngx_rbtree_insert_pt   insert;
  41. };


  44. ‌#define ngx_rbtree_init(tree, s, i)                                           \
  45.     ngx_rbtree_sentinel_init(s);                                              \
  46.     (tree)->root = s;                                                         \
  47.     (tree)->sentinel = s;                                                     \
  48.     (tree)->insert = i


  51. void ngx_rbtree_insert(ngx_rbtree_t *tree, ngx_rbtree_node_t *node);
  52. void ngx_rbtree_delete(ngx_rbtree_t *tree, ngx_rbtree_node_t *node);
  53. void ngx_rbtree_insert_value(ngx_rbtree_node_t *root, ngx_rbtree_node_t *node,
  54.     ngx_rbtree_node_t *sentinel);
  55. void ngx_rbtree_insert_timer_value(ngx_rbtree_node_t *root,
  56.     ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);


  59. ‌#define ngx_rbt_red(node)               ((node)->color = 1)
  60. ‌#define ngx_rbt_black(node)             ((node)->color = 0)
  61. ‌#define ngx_rbt_is_red(node)            ((node)->color)
  62. ‌#define ngx_rbt_is_black(node)          (!ngx_rbt_is_red(node))
  63. ‌#define ngx_rbt_copy_color(n1, n2)      (n1->color = n2->color)


  66. /* a sentinel must be black */

  68. ‌#define ngx_rbtree_sentinel_init(node)  ngx_rbt_black(node)


  71. static ngx_inline ngx_rbtree_node_t *
  72. ‌ngx_rbtree_min(ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
  73. {
  74.     while (node->left != sentinel) {
  75.         node = node->left;
  76.     }

  78.     return node;
  79. }


  82. #endif /* _NGX_RBTREE_H_INCLUDED_ */

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