katie/src/core/thread/qatomic.h

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#ifndef QATOMIC_H
#define QATOMIC_H

#include <QtCore/qbasicatomic.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

// High-level atomic integer operations
class Q_CORE_EXPORT QAtomicInt : public QBasicAtomicInt
{
public:
    inline QAtomicInt(int value = 0)
    {
#ifdef QT_ARCH_PARISC
        this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;
#endif
        _q_value = value;
    }
    inline QAtomicInt(const QAtomicInt &other)
    {
#ifdef QT_ARCH_PARISC
        this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;
#endif
        _q_value = other._q_value;
    }

    inline QAtomicInt &operator=(int value)
    {
        (void) QBasicAtomicInt::operator=(value);
        return *this;
    }

    inline QAtomicInt &operator=(const QAtomicInt &other)
    {
        (void) QBasicAtomicInt::operator=(other);
        return *this;
    }

};

// High-level atomic pointer operations
template <typename T>
class QAtomicPointer : public QBasicAtomicPointer<T>
{
public:
    inline QAtomicPointer(T *value = 0)
    {
#ifdef QT_ARCH_PARISC
        this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;
#endif
        QBasicAtomicPointer<T>::_q_value = value;
    }
    inline QAtomicPointer(const QAtomicPointer<T> &other)
    {
#ifdef QT_ARCH_PARISC
        this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;
#endif
        QBasicAtomicPointer<T>::_q_value = other._q_value;
    }

    inline QAtomicPointer<T> &operator=(T *value)
    {
        (void) QBasicAtomicPointer<T>::operator=(value);
        return *this;
    }

    inline QAtomicPointer<T> &operator=(const QAtomicPointer<T> &other)
    {
        (void) QBasicAtomicPointer<T>::operator=(other);
        return *this;
    }

};

/*!
    This is a helper for the assignment operators of implicitly
    shared classes. Your assignment operator should look like this:

    \snippet doc/src/snippets/code/src.corelib.thread.qatomic.h 0
*/
template <typename T>
inline void qAtomicAssign(T *&d, T *x)
{
    if (d == x)
        return;
    x->ref.ref();
    if (!d->ref.deref())
        delete d;
    d = x;
}

/*!
    This is a helper for the detach method of implicitly shared
    classes. Your private class needs a copy constructor which copies
    the members and sets the refcount to 1. After that, your detach
    function should look like this:

    \snippet doc/src/snippets/code/src.corelib.thread.qatomic.h 1
*/
template <typename T>
inline void qAtomicDetach(T *&d)
{
    if (d->ref == 1)
        return;
    T *x = d;
    d = new T(*d);
    if (!x->ref.deref())
        delete x;
}

QT_END_NAMESPACE
QT_END_HEADER

#endif // QATOMIC_H