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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtSystems module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qvaluespacemanager_p.h"
#include "gconflayer_p.h"
#include "registrylayer_win_p.h"
#include <QtCore/qmutex.h>
#include <QtCore/qthread.h>
#include <QtCore/private/qcoreapplication_p.h>
QT_BEGIN_NAMESPACE
static QBasicAtomicPointer<QValueSpaceManager> valueSpaceManager_ptr;
QValueSpaceManager *QValueSpaceManager::instance()
{
QValueSpaceManager *ptr = valueSpaceManager_ptr.loadAcquire();
if (!ptr) {
static QBasicMutex valueSpaceManager_mutex;
QMutexLocker locker(&valueSpaceManager_mutex);
if (!(ptr = valueSpaceManager_ptr.loadAcquire())) {
ptr = new QValueSpaceManager;
// make sure layers are installed in the priority order from high to low
#if defined(Q_OS_LINUX)
#if !defined(QT_NO_GCONFLAYER)
ptr->layers.append(GConfLayer::instance());
#endif
#elif defined(Q_OS_WIN)
ptr->layers.append(NonVolatileRegistryLayer::instance());
ptr->layers.append(VolatileRegistryLayer::instance());
#endif
// move all layers to a worker thread
if (ptr->layers.size() > 0) {
QThread *valueSpaceThread = new QThread();
valueSpaceThread->setObjectName(QStringLiteral("valueSpaceThread"));
valueSpaceThread->moveToThread(QCoreApplicationPrivate::mainThread());
for (int i = 0; i < ptr->layers.size(); ++i)
ptr->layers[i]->moveToThread(valueSpaceThread);
valueSpaceThread->start();
}
valueSpaceManager_ptr.storeRelease(ptr);
}
}
return ptr;
}
QValueSpaceManager::QValueSpaceManager()
{
}
QList<QAbstractValueSpaceLayer *> const &QValueSpaceManager::getLayers()
{
return layers;
}
QT_END_NAMESPACE
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