From 354bb40e75d94466e91fe6960523612c9d17ccfb Mon Sep 17 00:00:00 2001 From: Karen Arutyunov Date: Thu, 2 Nov 2017 23:11:29 +0300 Subject: Add implementation --- mysql/my_alloc.h | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 mysql/my_alloc.h (limited to 'mysql/my_alloc.h') diff --git a/mysql/my_alloc.h b/mysql/my_alloc.h new file mode 100644 index 0000000..d236c93 --- /dev/null +++ b/mysql/my_alloc.h @@ -0,0 +1,78 @@ +/* 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 02110-1301 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 + +/* PSI_memory_key */ +#include "mysql/psi/psi_memory.h" + +#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; + + /* + Maximum amount of memory this mem_root can hold. A value of 0 + implies there is no limit. + */ + size_t max_capacity; + + /* Allocated size for this mem_root */ + + size_t allocated_size; + + /* Enable this for error reporting if capacity is exceeded */ + my_bool error_for_capacity_exceeded; + + void (*error_handler)(void); + + PSI_memory_key m_psi_key; +} MEM_ROOT; + +#ifdef __cplusplus +} +#endif + +#endif -- cgit v1.1