| /* Copyright (C) 2000 MySQL AB |
| |
| 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 |
| |
| typedef struct st_used_mem |
| { /* struct for once_alloc (block) */ |
| struct st_used_mem *next; /* Next block in use */ |
| unsigned int left; /* memory left in block */ |
| unsigned int 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 */ |
| 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); |
| } MEM_ROOT; |
| #endif |