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110 lines
4.2 KiB
C++
110 lines
4.2 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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* This file contains the handle based Memory Manager defines
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*/
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#ifndef TINSEL_HEAPMEM_H
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#define TINSEL_HEAPMEM_H
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#include "tinsel/dw.h" // new data types
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namespace Tinsel {
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#define NUM_MNODES 192 // the number of memory management nodes (was 128, then 192)
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struct MEM_NODE {
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MEM_NODE *pNext; // link to the next node in the list
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MEM_NODE *pPrev; // link to the previous node in the list
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uint8 *pBaseAddr; // base address of the memory object
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long size; // size of the memory object
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uint32 lruTime; // time when memory object was last accessed
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int flags; // allocation attributes
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};
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// allocation flags for the MemoryAlloc function
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#define DWM_FIXED 0x0001 // allocates fixed memory
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#define DWM_MOVEABLE 0x0002 // allocates movable memory
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#define DWM_DISCARDABLE 0x0004 // allocates discardable memory
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#define DWM_NOALLOC 0x0008 // when used with discardable memory - allocates a discarded block
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#define DWM_NOCOMPACT 0x0010 // does not discard memory to satisfy the allocation request
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#define DWM_ZEROINIT 0x0020 // initialises memory contents to zero
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#define DWM_SOUND 0x0040 // allocate from the sound pool
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#define DWM_GRAPHIC 0x0080 // allocate from the graphics pool
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// return value from the MemoryFlags function
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#define DWM_DISCARDED 0x0100 // the objects memory block has been discarded
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// internal allocation flags
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#define DWM_LOCKED 0x0200 // the objects memory block is locked
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#define DWM_SENTINEL 0x0400 // the objects memory block is a sentinel
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/*----------------------------------------------------------------------*\
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|* Memory Function Prototypes *|
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\*----------------------------------------------------------------------*/
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void MemoryInit(void); // initialises the memory manager
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#ifdef DEBUG
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void MemoryStats(void); // Shows the maximum number of mnodes used at once
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#endif
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MEM_NODE *MemoryAlloc( // allocates the specified number of bytes from the heap
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int flags, // allocation attributes
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long size); // number of bytes to allocate
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void MemoryDiscard( // discards the specified memory object
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MEM_NODE *pMemNode); // node of the memory object
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int MemoryFlags( // returns information about the specified memory object
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MEM_NODE *pMemNode); // node of the memory object
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void MemoryFree( // frees the specified memory object and invalidates its node
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MEM_NODE *pMemNode); // node of the memory object
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MEM_NODE *MemoryHandle( // Retrieves the mnode associated with the specified pointer to a memory object
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void *pMem); // address of memory object
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void *MemoryLock( // locks a memory object and returns a pointer to the first byte of the objects memory block
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MEM_NODE *pMemNode); // node of the memory object
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MEM_NODE *MemoryReAlloc( // changes the size or attributes of a specified memory object
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MEM_NODE *pMemNode, // node of the memory object
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long size, // new size of block
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int flags); // how to reallocate the object
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long MemorySize( // returns the size, in bytes, of the specified memory object
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MEM_NODE *pMemNode); // node of the memory object
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void MemoryUnlock( // unlocks a memory object
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MEM_NODE *pMemNode); // node of the memory object
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bool HeapCompact( // Allocates the specified number of bytes from the specified heap
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long size, // number of bytes to free up
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bool bDiscard); // when set - will discard blocks to fullfill the request
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} // end of namespace Tinsel
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#endif
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