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61 lines
2.2 KiB
C++
61 lines
2.2 KiB
C++
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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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 as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifdef __GNUC__
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#pragma interface /* gcc class implementation */
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#endif
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#ifndef _CACHE_MANAGER_H_
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#define _CACHE_MANAGER_H_
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#endif
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/*
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cache_manager.h
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-----------------------------------------------------------------------
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The cache_manager class manages a number of blocks (which are allocatable
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units of memory).
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-----------------------------------------------------------------------
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*/
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class cache_manager {
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void **abs_list; /* List holding block abstraction ptrs */
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typedef struct free_blks {
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struct free_blks *next, **prev;
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uint Size;
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} FREE_BLKS;
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FREE_BLKS *base_ptr; /* Pointer to newly allocated sys mem */
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/* list manipulation methods */
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void *link_into_abs(void *); /* Return an abstract pointer to blk */
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bool *unlink_from_abs(void *); /* Used to dealloc a blk */
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void *find_in_fblist(uint); /* */
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/* memory allocation methods */
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void defrag(void); /* Defragment the cache */
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bool *init_blk(void *); /* Return a pointer to new list */
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public:
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cache_manager(uint); /* Get allocation of size from system */
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~cache_manager(void); /* Destructor; return the cache */
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void *alloc(uint); /* Alloc size bytes from the cache */
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bool *dealloc(void *); /* Deallocate blocks (with *ptr_arg) */
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void clear(void); /* Clear the cache */
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};
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