91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
/* Copyright (c) 2000, 2022, Oracle and/or its affiliates.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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Without limiting anything contained in the foregoing, this file,
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which is part of C Driver for MySQL (Connector/C), is also subject to the
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Universal FOSS Exception, version 1.0, a copy of which can be found at
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http://oss.oracle.com/licenses/universal-foss-exception.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/*
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Data structures for mysys/my_alloc.c (root memory allocator)
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*/
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#ifndef _my_alloc_h
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#define _my_alloc_h
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#define ALLOC_MAX_BLOCK_TO_DROP 4096
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#define ALLOC_MAX_BLOCK_USAGE_BEFORE_DROP 10
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/* PSI_memory_key */
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#include "mysql/psi/psi_memory.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct st_used_mem
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{ /* struct for once_alloc (block) */
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struct st_used_mem *next; /* Next block in use */
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unsigned int left; /* memory left in block */
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unsigned int size; /* size of block */
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} USED_MEM;
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typedef struct st_mem_root
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{
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USED_MEM *free; /* blocks with free memory in it */
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USED_MEM *used; /* blocks almost without free memory */
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USED_MEM *pre_alloc; /* preallocated block */
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/* if block have less memory it will be put in 'used' list */
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size_t min_malloc;
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size_t block_size; /* initial block size */
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unsigned int block_num; /* allocated blocks counter */
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/*
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first free block in queue test counter (if it exceed
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MAX_BLOCK_USAGE_BEFORE_DROP block will be dropped in 'used' list)
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*/
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unsigned int first_block_usage;
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/*
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Maximum amount of memory this mem_root can hold. A value of 0
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implies there is no limit.
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*/
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size_t max_capacity;
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/* Allocated size for this mem_root */
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size_t allocated_size;
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/* Enable this for error reporting if capacity is exceeded */
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my_bool error_for_capacity_exceeded;
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void (*error_handler)(void);
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PSI_memory_key m_psi_key;
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} MEM_ROOT;
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#ifdef __cplusplus
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}
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#endif
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#endif
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