1 /* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. 2 3 This program is free software; you can redistribute it and/or modify 4 it under the terms of the GNU General Public License, version 2.0, 5 as published by the Free Software Foundation. 6 7 This program is also distributed with certain software (including 8 but not limited to OpenSSL) that is licensed under separate terms, 9 as designated in a particular file or component or in included license 10 documentation. The authors of MySQL hereby grant you an additional 11 permission to link the program and your derivative works with the 12 separately licensed software that they have included with MySQL. 13 14 Without limiting anything contained in the foregoing, this file, 15 which is part of C Driver for MySQL (Connector/C), is also subject to the 16 Universal FOSS Exception, version 1.0, a copy of which can be found at 17 http://oss.oracle.com/licenses/universal-foss-exception. 18 19 This program is distributed in the hope that it will be useful, 20 but WITHOUT ANY WARRANTY; without even the implied warranty of 21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 GNU General Public License, version 2.0, for more details. 23 24 You should have received a copy of the GNU General Public License 25 along with this program; if not, write to the Free Software 26 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ 27 28 /* 29 Data structures for mysys/my_alloc.c (root memory allocator) 30 */ 31 32 #ifndef _my_alloc_h 33 #define _my_alloc_h 34 35 #define ALLOC_MAX_BLOCK_TO_DROP 4096 36 #define ALLOC_MAX_BLOCK_USAGE_BEFORE_DROP 10 37 38 #ifdef __cplusplus 39 extern "C" { 40 #endif 41 42 typedef struct st_used_mem 43 { /* struct for once_alloc (block) */ 44 struct st_used_mem *next; /* Next block in use */ 45 unsigned int left; /* memory left in block */ 46 unsigned int size; /* size of block */ 47 } USED_MEM; 48 49 50 typedef struct st_mem_root 51 { 52 USED_MEM *free; /* blocks with free memory in it */ 53 USED_MEM *used; /* blocks almost without free memory */ 54 USED_MEM *pre_alloc; /* preallocated block */ 55 /* if block have less memory it will be put in 'used' list */ 56 size_t min_malloc; 57 size_t block_size; /* initial block size */ 58 unsigned int block_num; /* allocated blocks counter */ 59 /* 60 first free block in queue test counter (if it exceed 61 MAX_BLOCK_USAGE_BEFORE_DROP block will be dropped in 'used' list) 62 */ 63 unsigned int first_block_usage; 64 65 void (*error_handler)(void); 66 } MEM_ROOT; 67 68 #ifdef __cplusplus 69 } 70 #endif 71 72 #endif 73