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//
// VMime library (http://www.vmime.org)
// Copyright (C) 2002-2006 Vincent Richard <vincent@vincent-richard.net>
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of
// the License, or (at your option) any later version.
//
// This program 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
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// Linking this library statically or dynamically with other modules is making
// a combined work based on this library. Thus, the terms and conditions of
// the GNU General Public License cover the whole combination.
//
#include "vmime/object.hpp"
#include "vmime/utility/smartPtr.hpp"
namespace vmime {
namespace utility {
// refManager
refManager::refManager(object* obj)
: m_object(obj), m_strongCount(1), m_weakCount(1)
{
}
refManager::~refManager()
{
}
const bool refManager::addStrong()
{
if (m_strongCount <= 0)
return false;
m_strongCount.increment();
m_weakCount.increment();
return true;
}
void refManager::releaseStrong()
{
m_strongCount.decrement();
if (m_strongCount.compareExchange(0, -424242) == 0) // prevent from adding strong refs later
deleteObject();
releaseWeak();
}
void refManager::addWeak()
{
m_weakCount.increment();
}
void refManager::releaseWeak()
{
if (m_weakCount.decrement() == 0)
deleteManager();
}
object* refManager::getObject()
{
return m_object;
}
void refManager::deleteManager()
{
delete this;
}
void refManager::deleteObject()
{
try
{
m_object->setRefManager(0);
delete m_object;
}
catch (...)
{
// Exception in destructor
}
m_object = 0;
}
const long refManager::getStrongRefCount() const
{
return m_strongCount;
}
const long refManager::getWeakRefCount() const
{
return m_weakCount;
}
// refCounter
refCounter::refCounter(const long initialValue)
: m_value(initialValue)
{
}
refCounter::~refCounter()
{
}
const long refCounter::increment()
{
return ++m_value;
}
const long refCounter::decrement()
{
return --m_value;
}
const long refCounter::compareExchange(const long compare, const long exchangeWith)
{
const int prev = m_value;
if (m_value == compare)
m_value = exchangeWith;
return prev;
}
refCounter::operator long() const
{
return m_value;
}
} // utility
} // vmime
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