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+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation ([email protected])
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial Usage
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** 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 1.1, 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 have questions regarding the use of this file, please contact
+** Nokia at [email protected].
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QATOMIC_SH_H
+#define QATOMIC_SH_H
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+#define Q_ATOMIC_INT_REFERENCE_COUNTING_IS_NOT_NATIVE
+
+inline bool QBasicAtomicInt::isReferenceCountingNative()
+{ return false; }
+inline bool QBasicAtomicInt::isReferenceCountingWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_INT_TEST_AND_SET_IS_NOT_NATIVE
+
+inline bool QBasicAtomicInt::isTestAndSetNative()
+{ return false; }
+inline bool QBasicAtomicInt::isTestAndSetWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_INT_FETCH_AND_STORE_IS_NOT_NATIVE
+
+inline bool QBasicAtomicInt::isFetchAndStoreNative()
+{ return false; }
+inline bool QBasicAtomicInt::isFetchAndStoreWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_INT_FETCH_AND_ADD_IS_NOT_NATIVE
+
+inline bool QBasicAtomicInt::isFetchAndAddNative()
+{ return false; }
+inline bool QBasicAtomicInt::isFetchAndAddWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_POINTER_TEST_AND_SET_IS_NOT_NATIVE
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isTestAndSetNative()
+{ return false; }
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isTestAndSetWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_POINTER_FETCH_AND_STORE_IS_NOT_NATIVE
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreNative()
+{ return false; }
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreWaitFree()
+{ return false; }
+
+#define Q_ATOMIC_POINTER_FETCH_AND_ADD_IS_NOT_NATIVE
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddNative()
+{ return false; }
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddWaitFree()
+{ return false; }
+
+extern Q_CORE_EXPORT volatile char qt_atomic_lock;
+Q_CORE_EXPORT void qt_atomic_yield(int *count);
+
+inline int qt_atomic_tasb(volatile char *ptr)
+{
+    register int ret;
+    asm volatile("tas.b @%2\n"
+                 "movt  %0"
+                 : "=&r"(ret), "=m"(*ptr)
+                 : "r"(ptr)
+                 : "cc", "memory");
+    return ret;
+}
+
+// Reference counting
+
+inline bool QBasicAtomicInt::ref()
+{
+    int count = 0;
+    while (qt_atomic_tasb(&qt_atomic_lock) == 0)
+        qt_atomic_yield(&count);
+    int originalValue = _q_value++;
+    qt_atomic_lock = 0;
+    return originalValue != -1;
+}
+
+inline bool QBasicAtomicInt::deref()
+{
+    int count = 0;
+    while (qt_atomic_tasb(&qt_atomic_lock) == 0)
+        qt_atomic_yield(&count);
+    int originalValue = _q_value--;
+    qt_atomic_lock = 0;
+    return originalValue != 1;
+}
+
+// Test and set for integers
+
+inline bool QBasicAtomicInt::testAndSetOrdered(int expectedValue, int newValue)
+{
+    bool returnValue = false;
+    int count = 0;
+    while (qt_atomic_tasb(&qt_atomic_lock) == 0)
+        qt_atomic_yield(&count);
+    if (_q_value == expectedValue) {
+        _q_value = newValue;
+        returnValue = true;
+    }
+    qt_atomic_lock = 0;
+    return returnValue;
+}
+
+inline bool QBasicAtomicInt::testAndSetRelaxed(int expectedValue, int newValue)
+{
+    return testAndSetOrdered(expectedValue, newValue);
+}
+
+inline bool QBasicAtomicInt::testAndSetAcquire(int expectedValue, int newValue)
+{
+    return testAndSetOrdered(expectedValue, newValue);
+}
+
+inline bool QBasicAtomicInt::testAndSetRelease(int expectedValue, int newValue)
+{
+    return testAndSetOrdered(expectedValue, newValue);
+}
+
+// Fetch and store for integers
+
+inline int QBasicAtomicInt::fetchAndStoreOrdered(int newValue)
+{
+    int count = 0;
+    while (qt_atomic_tasb(&qt_atomic_lock) == 0)
+        qt_atomic_yield(&count);
+    int originalValue = _q_value;
+    _q_value = newValue;
+    qt_atomic_lock = 0;
+    return originalValue;
+}
+
+inline int QBasicAtomicInt::fetchAndStoreRelaxed(int newValue)
+{
+    return fetchAndStoreOrdered(newValue);
+}
+
+inline int QBasicAtomicInt::fetchAndStoreAcquire(int newValue)
+{
+    return fetchAndStoreOrdered(newValue);
+}
+
+inline int QBasicAtomicInt::fetchAndStoreRelease(int newValue)
+{
+    return fetchAndStoreOrdered(newValue);
+}
+
+// Fetch and add for integers
+
+inline int QBasicAtomicInt::fetchAndAddOrdered(int valueToAdd)
+{
+    int count = 0;
+    while (qt_atomic_tasb(&qt_atomic_lock) == 0)
+        qt_atomic_yield(&count);
+    int originalValue = _q_value;
+    _q_value += valueToAdd;
+    qt_atomic_lock = 0;
+    return originalValue;
+}
+
+inline int QBasicAtomicInt::fetchAndAddRelaxed(int valueToAdd)
+{
+    return fetchAndAddOrdered(valueToAdd);
+}
+
+inline int QBasicAtomicInt::fetchAndAddAcquire(int valueToAdd)
+{
+    return fetchAndAddOrdered(valueToAdd);
+}
+
+inline int QBasicAtomicInt::fetchAndAddRelease(int valueToAdd)
+{
+    return fetchAndAddOrdered(valueToAdd);
+}
+
+// Test and set for pointers
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetOrdered(T *expectedValue, T *newValue)
+{
+    bool returnValue = false;
+    int count = 0;
+    while (qt_atomic_tasb(&qt_atomic_lock) == 0)
+        qt_atomic_yield(&count);
+    if (_q_value == expectedValue) {
+        _q_value = newValue;
+        returnValue = true;
+    }
+    qt_atomic_lock = 0;
+    return returnValue;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelaxed(T *expectedValue, T *newValue)
+{
+    return testAndSetOrdered(expectedValue, newValue);
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetAcquire(T *expectedValue, T *newValue)
+{
+    return testAndSetOrdered(expectedValue, newValue);
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelease(T *expectedValue, T *newValue)
+{
+    return testAndSetOrdered(expectedValue, newValue);
+}
+
+// Fetch and store for pointers
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreOrdered(T *newValue)
+{
+    int count = 0;
+    while (qt_atomic_tasb(&qt_atomic_lock) == 0)
+        qt_atomic_yield(&count);
+    T *originalValue = _q_value;
+    _q_value = newValue;
+    qt_atomic_lock = 0;
+    return originalValue;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelaxed(T *newValue)
+{
+    return fetchAndStoreOrdered(newValue);
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreAcquire(T *newValue)
+{
+    return fetchAndStoreOrdered(newValue);
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelease(T *newValue)
+{
+    return fetchAndStoreOrdered(newValue);
+}
+
+// Fetch and add for pointers
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddOrdered(qptrdiff valueToAdd)
+{
+    int count = 0;
+    while (qt_atomic_tasb(&qt_atomic_lock) == 0)
+        qt_atomic_yield(&count);
+    T *originalValue = (_q_value);
+    _q_value += valueToAdd;
+    qt_atomic_lock = 0;
+    return originalValue;
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelaxed(qptrdiff valueToAdd)
+{
+    return fetchAndAddOrdered(valueToAdd);
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddAcquire(qptrdiff valueToAdd)
+{
+    return fetchAndAddOrdered(valueToAdd);
+}
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelease(qptrdiff valueToAdd)
+{
+    return fetchAndAddOrdered(valueToAdd);
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QATOMIC_SH_H