gmSpinLock.h

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/************************************************************************
**
** Copyright (C) 2014 by Carlos Augusto Teixera Mendes
** All rights reserved.
**
** This file is part of the "GeMA" software. It's use should respect
** the terms in the license agreement that can be found together
** with this source code.
** It is provided AS IS, with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE.
**
************************************************************************/

#ifndef _GEMA_SPIN_LOCK_H_
#define _GEMA_SPIN_LOCK_H_

#include <QAtomicInteger>

class GmSpinLock : public QAtomicInt
{
public:
        GmSpinLock() : QAtomicInt(0) {}
    
        void lock() { while(!testAndSetAcquire(0, 1)); }

        bool tryLock() { return testAndSetAcquire(0, 1); }

        void unlock() { storeRelease(0); }
};

class GmSpinLocker
{
public:
  GmSpinLocker(GmSpinLock& lock) : _lock(lock) { _lock.lock(); }

  ~GmSpinLocker() { _lock.unlock(); }

private:
  GmSpinLock& _lock; 
};

#endif