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/*
Copyright 2009 David Nolden <david.nolden.kdevelop@art-master.de>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef KDEVPLATFORM_KSHAREDOBJECT_H
#define KDEVPLATFORM_KSHAREDOBJECT_H
#include <QSharedData>
#include <QObject>
namespace KDevelop {
struct FakeAtomic
{
inline FakeAtomic(QObject& object, QSharedData& real) : m_object(object)
, m_real(real)
{
}
inline operator int() const
{
const int value = m_real.ref.loadAcquire();
if (value == 0)
return 1; //Always return true, because we handle the deleting by ourself using deleteLater
return value;
}
inline bool ref()
{
return m_real.ref.ref();
}
inline bool deref()
{
bool ret = m_real.ref.deref();
if (!ret)
m_object.deleteLater();
return true; //Always return true, because we handle the deleting by ourself
}
#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
inline int loadRelaxed() const
{
return m_real.ref.loadRelaxed();
}
#else
inline int load() const
{
return m_real.ref.load();
}
#endif
QObject& m_object;
QSharedData& m_real;
};
/**
* Wrapper around QSharedData for use with KSharedPtr when the object is based on QObject as well.
* Instead of deleting the object once the reference-count reaches zero, QObject::deleteLater() is called.
* This prevents a possible crash when the reference-count reaches zero during event-processing while the queue
* contains events to be delivered to that object.
*
* Notice however that the object will not be deleted immediately, which may lead to unintended behavior.
*/
struct KSharedObject : public QSharedData
{
inline explicit KSharedObject(QObject& object) : ref(object, *this)
{
}
mutable FakeAtomic ref;
};
}
#endif
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