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qatomic_parisc.h

/****************************************************************************
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#ifndef PARISC_QATOMIC_H
#define PARISC_QATOMIC_H

#include <QtCore/qglobal.h>

QT_BEGIN_HEADER

extern "C" {
    Q_CORE_EXPORT void q_atomic_lock(int *lock);
    Q_CORE_EXPORT void q_atomic_unlock(int *lock);
    Q_CORE_EXPORT int q_atomic_test_and_set_ptr(volatile void *ptr, void *expected, void *newval);
    Q_CORE_EXPORT void *q_atomic_set_ptr(volatile void *ptr, void *newval);
}

#define Q_SPECIALIZED_QATOMIC

struct QBasicAtomic
{
    int lock[4];
    int atomic;

    inline void init(int x = 0)
    {
        lock[0] = lock[1] = lock[2] = lock[3] = -1; atomic = x;
    }

    inline bool ref()
    {
      q_atomic_lock(lock);
      bool ret = (++atomic != 0);
      q_atomic_unlock(lock);
      return ret;
    }

    inline bool deref()
    {
      q_atomic_lock(lock);
      bool ret = (--atomic != 0);
      q_atomic_unlock(lock);
      return ret;
    }

    inline bool operator==(int x) const
    { return atomic == x; }

    inline bool operator!=(int x) const
    { return atomic != x; }

    inline bool operator!() const
    { return atomic == 0; }

    inline QBasicAtomic &operator=(int x)
    {
        q_atomic_lock(lock);
        atomic = x;
        q_atomic_unlock(lock);
        return *this;
    }

    inline operator int() const
    { return atomic; }

    inline bool testAndSet(int expected, int newval)
    {
      q_atomic_lock(lock);
      if (atomic == expected) {
            atomic = newval;
          q_atomic_unlock(lock);
          return true;
        }
      q_atomic_unlock(lock);
      return false;
    }
    
    inline bool testAndSetAcquire(int expected, int newval)
    {
        return testAndSet(expected, newval);
    }
    
    inline bool testAndSetRelease(int expected, int newval)
    {
        return testAndSet(expected, newval);
    }

    inline int exchange(int newval)
    {
      q_atomic_lock(lock);
      int oldval = atomic;
      atomic = newval;
      q_atomic_unlock(lock);
      return oldval;
    }
};

template <typename T>
struct QBasicAtomicPointer
{
    int lock[4];
    volatile T *pointer;

    inline void init(T *t = 0)
    {
        lock[0] = lock[1] = lock[2] = lock[3] = -1; pointer = t;
    }

    inline bool operator==(T *x) const
    {
      return pointer == x;
    }

    inline bool operator!=(T *x) const
    {
      return pointer != x;
    }

    inline bool operator!() const
    { return operator==(0); }

    inline QBasicAtomicPointer<T> &operator=(T *t)
    {
        q_atomic_lock(lock);
        pointer = const_cast<T *>(t);
        q_atomic_unlock(lock);
        return *this;
    }

    inline T *operator->()
    { return const_cast<T *>(pointer); }
    inline const T *operator->() const
    { return pointer; }

    inline operator T*() const
    { return const_cast<T *>(pointer); }

    inline bool testAndSet(T* expected, T *newval)
    {
      q_atomic_lock(lock);
      if (pointer == expected) {
          pointer = newval;
          q_atomic_unlock(lock);
          return true;
      }
      q_atomic_unlock(lock);
      return false;
    }

    inline T *exchange(T *newval)
    {
      q_atomic_lock(lock);
      T *oldval = const_cast<T *>(pointer);
      pointer = newval;
      q_atomic_unlock(lock);
      return oldval;
    }
};

#define Q_ATOMIC_INIT(a) {{-1,-1,-1,-1},(a)}

QT_END_HEADER

#endif // PARISC_QATOMIC_H

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