engines/sword1/memman.h

   1 /* ScummVM - Graphic Adventure Engine
   2  *
   3  * ScummVM is the legal property of its developers, whose names
   4  * are too numerous to list here. Please refer to the COPYRIGHT
   5  * file distributed with this source distribution.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version 2
  10  * of the License, or (at your option) any later version.
  11
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  20  *
  21  * $URL$
  22  * $Id$
  23  *
  24  */
  25
  26 #ifndef SWORD1_MEMMAN_H
  27 #define SWORD1_MEMMAN_H
  28
  29 #include "common/scummsys.h"
  30
  31 namespace Sword1 {
  32
  33 struct MemHandle {
  34         void *data;
  35         uint32 size;
  36         uint32 refCount;
  37         uint16 cond;
  38         MemHandle *next, *prev;
  39 };
  40 // mem conditions:
  41 #define MEM_FREED               0
  42 #define MEM_CAN_FREE    1
  43 #define MEM_DONT_FREE   2
  44
  45 #ifdef PALMOS_MODE
  46 #define MAX_ALLOC (3*1024*1024) // max amount of mem we want to alloc().
  47 #else
  48 #define MAX_ALLOC (6*1024*1024) // max amount of mem we want to alloc().
  49 #endif
  50
  51 class MemMan {
  52 public:
  53         MemMan(void);
  54         ~MemMan(void);
  55         void alloc(MemHandle *bsMem, uint32 pSize, uint16 pCond = MEM_DONT_FREE);
  56         void setCondition(MemHandle *bsMem, uint16 pCond);
  57         void freeNow(MemHandle *bsMem);
  58         void initHandle(MemHandle *bsMem);
  59         void flush(void);
  60 private:
  61         void addToFreeList(MemHandle *bsMem);
  62         void removeFromFreeList(MemHandle *bsMem);
  63         void checkMemoryUsage(void);
  64         uint32 _alloced;  //currently allocated memory
  65         MemHandle *_memListFree;
  66         MemHandle *_memListFreeEnd;
  67 };
  68
  69 } // End of namespace Sword1
  70
  71 #endif //MEMMAN_H