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/*
* Copyright (C) 2010 Apple Inc. All rights reserved.
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2010 University of Szeged
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef MappedMemoryPool_h
#define MappedMemoryPool_h
#include <QFile>
#include <QObject>
#include <wtf/StdLibExtras.h>
#include <wtf/Vector.h>
namespace WebKit {
class MappedMemoryPool;
struct MappedMemory {
QString mappedFileName() const
{
ASSERT(file);
ASSERT(mappedBytes);
return fileName;
}
void markFree()
{
ASSERT(mappedBytes);
dataPtr->isFree = true;
}
uchar* data() const
{
ASSERT(mappedBytes);
return dataPtr->bytes;
}
private:
friend class MappedMemoryPool;
MappedMemory()
: file(0)
, mappedBytes(0)
, dataSize(0)
{
}
void markUsed() { dataPtr->isFree = false; }
size_t mapSize() const { return dataSize + sizeof(Data); }
bool isFree() const { return dataPtr->isFree; }
struct Data {
uint32_t isFree; // keep bytes aligned
uchar bytes[];
};
QFile* file;
QString fileName;
union {
uchar* mappedBytes;
Data* dataPtr;
};
size_t dataSize;
};
class MappedMemoryPool : QObject {
Q_OBJECT
public:
static MappedMemoryPool* instance();
MappedMemory* mapMemory(size_t size);
MappedMemory* mapFile(QString fileName, size_t size);
private:
MappedMemoryPool() { }
~MappedMemoryPool();
static MappedMemoryPool* theInstance;
Vector<MappedMemory> m_pool;
};
} // namespace WebKit
#endif // MappedMemoryPool_h
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