| |
| /* |
| * Copyright (C) Igor Sysoev |
| * Copyright (C) Nginx, Inc. |
| */ |
| |
| |
| #ifndef _NGX_RBTREE_H_INCLUDED_ |
| #define _NGX_RBTREE_H_INCLUDED_ |
| |
| |
| #include <ngx_config.h> |
| #include <ngx_core.h> |
| |
| |
| typedef ngx_uint_t ngx_rbtree_key_t; |
| typedef ngx_int_t ngx_rbtree_key_int_t; |
| |
| |
| typedef struct ngx_rbtree_node_s ngx_rbtree_node_t; |
| |
| struct ngx_rbtree_node_s { |
| ngx_rbtree_key_t key; |
| ngx_rbtree_node_t *left; |
| ngx_rbtree_node_t *right; |
| ngx_rbtree_node_t *parent; |
| u_char color; |
| u_char data; |
| }; |
| |
| |
| typedef struct ngx_rbtree_s ngx_rbtree_t; |
| |
| typedef void (*ngx_rbtree_insert_pt) (ngx_rbtree_node_t *root, |
| ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); |
| |
| struct ngx_rbtree_s { |
| ngx_rbtree_node_t *root; |
| ngx_rbtree_node_t *sentinel; |
| ngx_rbtree_insert_pt insert; |
| }; |
| |
| |
| #define ngx_rbtree_init(tree, s, i) \ |
| ngx_rbtree_sentinel_init(s); \ |
| (tree)->root = s; \ |
| (tree)->sentinel = s; \ |
| (tree)->insert = i |
| |
| |
| void ngx_rbtree_insert(ngx_rbtree_t *tree, ngx_rbtree_node_t *node); |
| void ngx_rbtree_delete(ngx_rbtree_t *tree, ngx_rbtree_node_t *node); |
| void ngx_rbtree_insert_value(ngx_rbtree_node_t *root, ngx_rbtree_node_t *node, |
| ngx_rbtree_node_t *sentinel); |
| void ngx_rbtree_insert_timer_value(ngx_rbtree_node_t *root, |
| ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel); |
| |
| |
| #define ngx_rbt_red(node) ((node)->color = 1) |
| #define ngx_rbt_black(node) ((node)->color = 0) |
| #define ngx_rbt_is_red(node) ((node)->color) |
| #define ngx_rbt_is_black(node) (!ngx_rbt_is_red(node)) |
| #define ngx_rbt_copy_color(n1, n2) (n1->color = n2->color) |
| |
| |
| /* a sentinel must be black */ |
| |
| #define ngx_rbtree_sentinel_init(node) ngx_rbt_black(node) |
| |
| |
| static ngx_inline ngx_rbtree_node_t * |
| ngx_rbtree_min(ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
| { |
| while (node->left != sentinel) { |
| node = node->left; |
| } |
| |
| return node; |
| } |
| |
| |
| #endif /* _NGX_RBTREE_H_INCLUDED_ */ |