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/*
* Copyright (C) 2010 University of Szeged
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
* All rights reserved.
*
* 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 UNIVERSITY OF SZEGED ``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 UNIVERSITY OF SZEGED OR
* 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.
*/
#include "MappedMemoryPool.h"
#include "CleanupHandler.h"
#include "StdLibExtras.h"
#include <QDir>
#include <QIODevice>
#include <QTemporaryFile>
namespace WebKit {
MappedMemoryPool* MappedMemoryPool::theInstance = 0;
MappedMemoryPool* MappedMemoryPool::instance()
{
if (!theInstance) {
theInstance = new MappedMemoryPool;
// Do not leave mapping files on the disk.
CleanupHandler::instance()->markForCleanup(theInstance);
}
return theInstance;
}
MappedMemoryPool::~MappedMemoryPool()
{
CleanupHandler::instance()->unmark(theInstance);
for (unsigned n = 0; n < m_pool.size(); ++n) {
MappedMemory& current = m_pool.at(n);
if (!current.file)
continue;
current.file->remove();
delete current.file;
}
m_pool.clear();
}
MappedMemory* MappedMemoryPool::mapMemory(size_t size)
{
for (unsigned n = 0; n < m_pool.size(); ++n) {
MappedMemory& current = m_pool.at(n);
if (current.dataSize >= size && current.isFree()) {
current.markUsed();
return ¤t;
}
}
MappedMemory newMap;
newMap.dataSize = size;
newMap.file = new QTemporaryFile(QDir::tempPath() + "/WebKit2UpdateChunk");
newMap.file->open(QIODevice::ReadWrite);
newMap.fileName = newMap.file->fileName();
newMap.file->resize(newMap.mapSize());
newMap.mappedBytes = newMap.file->map(0, newMap.mapSize());
newMap.file->close();
newMap.markUsed();
m_pool.append(newMap);
return &m_pool.last();
}
MappedMemory* MappedMemoryPool::mapFile(QString fileName, size_t size)
{
for (unsigned n = 0; n < m_pool.size(); ++n) {
MappedMemory& current = m_pool.at(n);
if (current.fileName == fileName) {
ASSERT(!current.isFree());
return ¤t;
}
}
MappedMemory newMap;
newMap.file = new QFile(fileName);
newMap.fileName = fileName;
newMap.dataSize = size;
ASSERT(newMap.file->exists());
ASSERT(newMap.file->size() >= newMap.mapSize());
newMap.file->open(QIODevice::ReadWrite);
newMap.mappedBytes = newMap.file->map(0, newMap.mapSize());
ASSERT(newMap.mappedBytes);
ASSERT(!newMap.isFree());
newMap.file->close();
m_pool.append(newMap);
return &m_pool.last();
}
} // namespace WebKit
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