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proc
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root
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proc
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usr
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include
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mysql
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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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