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104 lines
2.0 KiB
C++
104 lines
2.0 KiB
C++
/*
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* atomic_int.h - fallback AtomicInt class when Qt is too old
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*
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* Copyright (c) 2009 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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*
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* This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef _ATOMIC_INT_H
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#define _ATOMIC_INT_H
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#include <QtCore/QMutex>
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#if QT_VERSION >= 0x040400
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typedef QAtomicInt AtomicInt;
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#else
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// implement our own (slow) QAtomicInt class when on old Qt
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class AtomicInt
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{
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public:
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inline AtomicInt( int _value = 0 ) :
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m_value( _value ),
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m_lock()
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{
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}
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inline AtomicInt( const AtomicInt & _copy ) :
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m_value( _copy.m_value ),
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m_lock()
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{
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}
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inline int fetchAndStoreOrdered( int _newVal )
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{
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m_lock.lock();
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const int oldVal = m_value;
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m_value = _newVal;
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m_lock.unlock();
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return oldVal;
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}
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inline int fetchAndAddOrdered( int _add )
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{
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m_lock.lock();
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const int oldVal = m_value;
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m_value += _add;
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m_lock.unlock();
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return oldVal;
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}
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inline AtomicInt & operator=( const AtomicInt & _copy )
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{
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m_lock.lock();
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m_value = _copy.m_value;
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m_lock.unlock();
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return *this;
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}
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inline AtomicInt & operator=( int _value )
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{
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m_lock.lock();
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m_value = _value;
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m_lock.unlock();
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return *this;
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}
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inline operator int() const
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{
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return m_value;
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}
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private:
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volatile int m_value;
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QMutex m_lock;
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} ;
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#endif
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#endif
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