Current File : //usr/include/mysql/server/private/my_tree.h
/* Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
#ifndef _tree_h
#define _tree_h
#ifdef __cplusplus
extern "C" {
#endif
#include "my_base.h" /* get 'enum ha_rkey_function' */
#include "my_alloc.h" /* MEM_ROOT */
/* Worst case tree is half full. This gives use 2^(MAX_TREE_HEIGHT/2) leafs */
#define MAX_TREE_HEIGHT 64
#define ELEMENT_KEY(tree,element)\
(tree->offset_to_key ? (void*)((uchar*) element+tree->offset_to_key) :\
*((void**) (element+1)))
#define tree_set_pointer(element,ptr) *((uchar **) (element+1))=((uchar*) (ptr))
/*
A tree with its flag set to TREE_ONLY_DUPS behaves differently on inserting
an element that is not in the tree:
the element is not added at all, but instead tree_insert() returns a special
address TREE_ELEMENT_UNIQUE as an indication that the function has not failed
due to lack of memory.
*/
#define TREE_ELEMENT_UNIQUE ((TREE_ELEMENT *) 1)
#define TREE_NO_DUPS 1
#define TREE_ONLY_DUPS 2
typedef enum { left_root_right, right_root_left } TREE_WALK;
typedef uint32 element_count;
typedef int (*tree_walk_action)(void *,element_count,void *);
typedef enum { free_init, free_free, free_end } TREE_FREE;
typedef int (*tree_element_free)(void*, TREE_FREE, void *);
typedef struct st_tree_element {
struct st_tree_element *left,*right;
uint32 count:31,
colour:1; /* black is marked as 1 */
} TREE_ELEMENT;
#define ELEMENT_CHILD(element, offs) (*(TREE_ELEMENT**)((char*)element + offs))
typedef struct st_tree {
TREE_ELEMENT *root;
TREE_ELEMENT **parents[MAX_TREE_HEIGHT];
uint offset_to_key,elements_in_tree,size_of_element;
size_t memory_limit, allocated;
qsort_cmp2 compare;
void *custom_arg;
MEM_ROOT mem_root;
my_bool with_delete;
tree_element_free free;
myf my_flags;
uint flag;
} TREE;
/* Functions on whole tree */
void init_tree(TREE *tree, size_t default_alloc_size, size_t memory_limit,
int size, qsort_cmp2 compare,
tree_element_free free_element, void *custom_arg,
myf my_flags);
int delete_tree(TREE*, my_bool abort);
int reset_tree(TREE*);
/* similar to delete tree, except we do not my_free() blocks in mem_root */
#define is_tree_inited(tree) ((tree)->root != 0)
/* Functions on leafs */
TREE_ELEMENT *tree_insert(TREE *tree,void *key, uint key_size,
void *custom_arg);
void *tree_search(TREE *tree, void *key, void *custom_arg);
int tree_walk(TREE *tree,tree_walk_action action,
void *argument, TREE_WALK visit);
int tree_delete(TREE *tree, void *key, uint key_size, void *custom_arg);
void *tree_search_key(TREE *tree, const void *key,
TREE_ELEMENT **parents, TREE_ELEMENT ***last_pos,
enum ha_rkey_function flag, void *custom_arg);
void *tree_search_edge(TREE *tree, TREE_ELEMENT **parents,
TREE_ELEMENT ***last_pos, int child_offs);
void *tree_search_next(TREE *tree, TREE_ELEMENT ***last_pos, int l_offs,
int r_offs);
ha_rows tree_record_pos(TREE *tree, const void *key,
enum ha_rkey_function search_flag, void *custom_arg);
#define reset_free_element(tree) (tree)->free= 0
#define TREE_ELEMENT_EXTRA_SIZE (sizeof(TREE_ELEMENT) + sizeof(void*))
#ifdef __cplusplus
}
#endif
#endif
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