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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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 */
#ifdef __GNUC__
#pragma interface /* gcc class implementation */
#endif
#ifndef _CACHE_MANAGER_H_
#define _CACHE_MANAGER_H_
#endif
/*
cache_manager.h
-----------------------------------------------------------------------
The cache_manager class manages a number of blocks (which are allocatable
units of memory).
-----------------------------------------------------------------------
*/
class cache_manager {
void **abs_list; /* List holding block abstraction ptrs */
typedef struct free_blks {
struct free_blks *next, **prev;
uint Size;
} FREE_BLKS;
FREE_BLKS *base_ptr; /* Pointer to newly allocated sys mem */
/* list manipulation methods */
void *link_into_abs(void *); /* Return an abstract pointer to blk */
bool *unlink_from_abs(void *); /* Used to dealloc a blk */
void *find_in_fblist(uint); /* */
/* memory allocation methods */
void defrag(void); /* Defragment the cache */
bool *init_blk(void *); /* Return a pointer to new list */
public:
cache_manager(uint); /* Get allocation of size from system */
~cache_manager(void); /* Destructor; return the cache */
void *alloc(uint); /* Alloc size bytes from the cache */
bool *dealloc(void *); /* Deallocate blocks (with *ptr_arg) */
void clear(void); /* Clear the cache */
};
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