Viewing file: my_alloc.h (1.88 KB) -rw-rw-rw- Select action/file-type: (+) | (+) | (+) | Code (+) | Session (+) | (+) | SDB (+) | (+) | (+) | (+) | (+) | (+) |
/* 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 02110-1301 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 */ 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;
#ifdef __cplusplus } #endif
#endif
|