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/****************************************************************************
**
** Copyright (C) 1993-2009 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#pragma once
//==============================================================================
// Includes
//==============================================================================
#include "Qt3DSMemoryProbe.h"
//==============================================================================
// Namespace
//==============================================================================
namespace Q3DStudio {
//==============================================================================
/**
* Managed memory allocation using fixed-size chunks.
*
* The pool class implements a generic algorithm that favors reusing recently
* used memory chunks instead of returning memory continously. Yet, a fresh
* pool will always return chunks positioned side by side.
*
* If a chunk is freed it will be the first to be returned next time a fresh
* chunk is new'ed. This makes the cache lines happier. Deleted chunks are
* maintained by linking to each other instead of being stored in a separate
* memory consuming array.
*/
class CMemoryPool
{
//==============================================================================
// Fields
//==============================================================================
protected:
INT32 m_ChunkSize; ///< size in bytes of each chunk
INT32 m_ChunkCount; ///< number of chunks in pool
INT8 *m_Ceiling; ///< ceiling memory pointer
INT8 *m_Memory; ///< base memory pointer, INT8 for easy pointer arithemtic
INT8 *m_Top; ///< edge of free continous memory
void *m_Hole; ///< first dis-continous memory chunk if any
CMemoryProbe m_Probe; ///< call and byte data on pool usage
CHAR m_Description[32]; ///< short description of this pool
//==============================================================================
// Methods
//==============================================================================
public: // Construction
CMemoryPool();
~CMemoryPool();
public: // Initialization
void Initialize(const CHAR *inName, const INT32 inChunkSize, const INT32 inChunkCount);
void Release();
public: // Allocation and Deallocation
void *Allocate();
void Free(void *inChunk);
BOOL IsFull() const;
BOOL OwnsChunk(const void *inChunk) const;
protected: // Implementation
void *UseTop();
void PushHole(void *inChunk);
void *PopHole();
public: // Statistics and reports
INT32 GetFreeHoles() const;
INT32 GetFreeTops() const;
INT32 GetFreeChunks() const;
INT32 GetChunkSize() const { return m_ChunkSize; }
INT32 GetChunkCount() const { return m_ChunkCount; }
CMemoryProbe &GetProbe() { return m_Probe; }
};
} // namespace Q3DStudio
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