Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QATOMIC_H
+#define QATOMIC_H
+
+#include <QtCore/qglobal.h>
+#include <QtCore/qbasicatomic.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+// 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;
+    }
+
+#ifdef qdoc
+    bool operator==(int value) const;
+    bool operator!=(int value) const;
+    bool operator!() const;
+    operator int() const;
+
+    static bool isReferenceCountingNative();
+    static bool isReferenceCountingWaitFree();
+
+    bool ref();
+    bool deref();
+
+    static bool isTestAndSetNative();
+    static bool isTestAndSetWaitFree();
+
+    bool testAndSetRelaxed(int expectedValue, int newValue);
+    bool testAndSetAcquire(int expectedValue, int newValue);
+    bool testAndSetRelease(int expectedValue, int newValue);
+    bool testAndSetOrdered(int expectedValue, int newValue);
+
+    static bool isFetchAndStoreNative();
+    static bool isFetchAndStoreWaitFree();
+
+    int fetchAndStoreRelaxed(int newValue);
+    int fetchAndStoreAcquire(int newValue);
+    int fetchAndStoreRelease(int newValue);
+    int fetchAndStoreOrdered(int newValue);
+
+    static bool isFetchAndAddNative();
+    static bool isFetchAndAddWaitFree();
+
+    int fetchAndAddRelaxed(int valueToAdd);
+    int fetchAndAddAcquire(int valueToAdd);
+    int fetchAndAddRelease(int valueToAdd);
+    int fetchAndAddOrdered(int valueToAdd);
+#endif
+};
+
+// 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;
+    }
+
+#ifdef qdoc
+    bool operator==(T *value) const;
+    bool operator!=(T *value) const;
+    bool operator!() const;
+    operator T *() const;
+    T *operator->() const;
+
+    static bool isTestAndSetNative();
+    static bool isTestAndSetWaitFree();
+
+    bool testAndSetRelaxed(T *expectedValue, T *newValue);
+    bool testAndSetAcquire(T *expectedValue, T *newValue);
+    bool testAndSetRelease(T *expectedValue, T *newValue);
+    bool testAndSetOrdered(T *expectedValue, T *newValue);
+
+    static bool isFetchAndStoreNative();
+    static bool isFetchAndStoreWaitFree();
+
+    T *fetchAndStoreRelaxed(T *newValue);
+    T *fetchAndStoreAcquire(T *newValue);
+    T *fetchAndStoreRelease(T *newValue);
+    T *fetchAndStoreOrdered(T *newValue);
+
+    static bool isFetchAndAddNative();
+    static bool isFetchAndAddWaitFree();
+
+    T *fetchAndAddRelaxed(qptrdiff valueToAdd);
+    T *fetchAndAddAcquire(qptrdiff valueToAdd);
+    T *fetchAndAddRelease(qptrdiff valueToAdd);
+    T *fetchAndAddOrdered(qptrdiff valueToAdd);
+#endif
+};
+
+/*!
+    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