diff options
Diffstat (limited to 'app/nginx/src/core/ngx_rbtree.h')
-rw-r--r-- | app/nginx/src/core/ngx_rbtree.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/app/nginx/src/core/ngx_rbtree.h b/app/nginx/src/core/ngx_rbtree.h new file mode 100644 index 0000000..97f0e3e --- /dev/null +++ b/app/nginx/src/core/ngx_rbtree.h @@ -0,0 +1,84 @@ + +/* + * 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); +ngx_rbtree_node_t *ngx_rbtree_next(ngx_rbtree_t *tree, + ngx_rbtree_node_t *node); + + +#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_ */ |