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/* Copyright (c) 2000, 2010, 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 */ /* Data structures for mysys/my_alloc.c (root memory allocator) */ #ifndef _my_alloc_h #define _my_alloc_h #define ALLOC_MAX_BLOCK_TO_DROP 4096 #define ALLOC_MAX_BLOCK_USAGE_BEFORE_DROP 10 #ifdef __cplusplus extern "C" { #endif typedef struct st_used_mem { /* struct for once_alloc (block) */ struct st_used_mem *next; /* Next block in use */ size_t left; /* memory left in block */ size_t size; /* size of block */ } USED_MEM; typedef struct st_mem_root { USED_MEM *free; /* blocks with free memory in it */ USED_MEM *used; /* blocks almost without free memory */ USED_MEM *pre_alloc; /* preallocated block */ /* if block have less memory it will be put in 'used' list */ size_t min_malloc; size_t block_size; /* initial block size */ size_t total_alloc; unsigned int block_num; /* allocated blocks counter */ /* first free block in queue test counter (if it exceed MAX_BLOCK_USAGE_BEFORE_DROP block will be dropped in 'used' list) */ unsigned int first_block_usage; void (*error_handler)(void); const char *name; } MEM_ROOT; #ifdef __cplusplus } #endif #endif