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+/* 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; either version 2 of the License, or
+ (at your option) any later version.
+
+ 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 */
+ unsigned int min_malloc;
+ unsigned int 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 droped in 'used' list)
+ */
+ unsigned int first_block_usage;
+
+ void (*error_handler)(void);
+} MEM_ROOT;
+#endif