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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QATOMIC_ARMV5_H
+#define QATOMIC_ARMV5_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_ALWAYS_NATIVE
+#define Q_ATOMIC_INT_FETCH_AND_STORE_IS_WAIT_FREE
+
+inline bool QBasicAtomicInt::isFetchAndStoreNative()
+{ return true; }
+inline bool QBasicAtomicInt::isFetchAndStoreWaitFree()
+{ return true; }
+
+#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_ALWAYS_NATIVE
+#define Q_ATOMIC_POINTER_FETCH_AND_STORE_IS_WAIT_FREE
+
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreNative()
+{ return true; }
+template <typename T>
+Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndStoreWaitFree()
+{ return true; }
+
+#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; }
+
+#ifndef QT_NO_ARM_EABI
+
+// kernel places a restartable cmpxchg implementation at a fixed address
+extern "C" typedef int (qt_atomic_eabi_cmpxchg_int_t)(int oldval, int newval, volatile int *ptr);
+extern "C" typedef int (qt_atomic_eabi_cmpxchg_ptr_t)(const void *oldval, const void *newval, volatile void *ptr);
+#define qt_atomic_eabi_cmpxchg_int (*reinterpret_cast<qt_atomic_eabi_cmpxchg_int_t *>(0xffff0fc0))
+#define qt_atomic_eabi_cmpxchg_ptr (*reinterpret_cast<qt_atomic_eabi_cmpxchg_ptr_t *>(0xffff0fc0))
+
+#else
+
+extern Q_CORE_EXPORT char q_atomic_lock;
+Q_CORE_EXPORT void qt_atomic_yield(int *);
+
+#ifdef Q_CC_RVCT
+
+Q_CORE_EXPORT __asm char q_atomic_swp(volatile char *ptr, char newval);
+
+#else
+
+inline char q_atomic_swp(volatile char *ptr, char newval)
+{
+ register char ret;
+ asm volatile("swpb %0,%2,[%3]"
+ : "=&r"(ret), "=m" (*ptr)
+ : "r"(newval), "r"(ptr)
+ : "cc", "memory");
+ return ret;
+}
+
+#endif // Q_CC_RVCT
+
+#endif // QT_NO_ARM_EABI
+
+// Reference counting
+
+inline bool QBasicAtomicInt::ref()
+{
+#ifndef QT_NO_ARM_EABI
+ register int originalValue;
+ register int newValue;
+ do {
+ originalValue = _q_value;
+ newValue = originalValue + 1;
+ } while (qt_atomic_eabi_cmpxchg_int(originalValue, newValue, &_q_value) != 0);
+ return newValue != 0;
+#else
+ int count = 0;
+ while (q_atomic_swp(&q_atomic_lock, ~0) != 0)
+ qt_atomic_yield(&count);
+ int originalValue = _q_value++;
+ q_atomic_swp(&q_atomic_lock, 0);
+ return originalValue != -1;
+#endif
+}
+
+inline bool QBasicAtomicInt::deref()
+{
+#ifndef QT_NO_ARM_EABI
+ register int originalValue;
+ register int newValue;
+ do {
+ originalValue = _q_value;
+ newValue = originalValue - 1;
+ } while (qt_atomic_eabi_cmpxchg_int(originalValue, newValue, &_q_value) != 0);
+ return newValue != 0;
+#else
+ int count = 0;
+ while (q_atomic_swp(&q_atomic_lock, ~0) != 0)
+ qt_atomic_yield(&count);
+ int originalValue = _q_value--;
+ q_atomic_swp(&q_atomic_lock, 0);
+ return originalValue != 1;
+#endif
+}
+
+// Test and set for integers
+
+inline bool QBasicAtomicInt::testAndSetOrdered(int expectedValue, int newValue)
+{
+#ifndef QT_NO_ARM_EABI
+ register int originalValue;
+ do {
+ originalValue = _q_value;
+ if (originalValue != expectedValue)
+ return false;
+ } while (qt_atomic_eabi_cmpxchg_int(expectedValue, newValue, &_q_value) != 0);
+ return true;
+#else
+ bool returnValue = false;
+ int count = 0;
+ while (q_atomic_swp(&q_atomic_lock, ~0) != 0)
+ qt_atomic_yield(&count);
+ if (_q_value == expectedValue) {
+ _q_value = newValue;
+ returnValue = true;
+ }
+ q_atomic_swp(&q_atomic_lock, 0);
+ return returnValue;
+#endif
+}
+
+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
+
+#ifndef Q_CC_RVCT
+
+inline int QBasicAtomicInt::fetchAndStoreOrdered(int newValue)
+{
+ int originalValue;
+ asm volatile("swp %0,%2,[%3]"
+ : "=&r"(originalValue), "=m" (_q_value)
+ : "r"(newValue), "r"(&_q_value)
+ : "cc", "memory");
+ return originalValue;
+}
+
+#endif
+
+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)
+{
+#ifndef QT_NO_ARM_EABI
+ register int originalValue;
+ register int newValue;
+ do {
+ originalValue = _q_value;
+ newValue = originalValue + valueToAdd;
+ } while (qt_atomic_eabi_cmpxchg_int(originalValue, newValue, &_q_value) != 0);
+ return originalValue;
+#else
+ int count = 0;
+ while (q_atomic_swp(&q_atomic_lock, ~0) != 0)
+ qt_atomic_yield(&count);
+ int originalValue = _q_value;
+ _q_value += valueToAdd;
+ q_atomic_swp(&q_atomic_lock, 0);
+ return originalValue;
+#endif
+}
+
+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)
+{
+#ifndef QT_NO_ARM_EABI
+ register T *originalValue;
+ do {
+ originalValue = _q_value;
+ if (originalValue != expectedValue)
+ return false;
+ } while (qt_atomic_eabi_cmpxchg_ptr(expectedValue, newValue, &_q_value) != 0);
+ return true;
+#else
+ bool returnValue = false;
+ int count = 0;
+ while (q_atomic_swp(&q_atomic_lock, ~0) != 0)
+ qt_atomic_yield(&count);
+ if (_q_value == expectedValue) {
+ _q_value = newValue;
+ returnValue = true;
+ }
+ q_atomic_swp(&q_atomic_lock, 0);
+ return returnValue;
+#endif
+}
+
+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
+
+#ifdef Q_CC_RVCT
+
+template <typename T>
+__asm T *QBasicAtomicPointer<T>::fetchAndStoreOrdered(T *newValue)
+{
+ add r2, pc, #0
+ bx r2
+ arm
+ swp r2,r1,[r0]
+ mov r0, r2
+ bx lr
+ thumb
+}
+
+#else
+
+template <typename T>
+Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreOrdered(T *newValue)
+{
+ T *originalValue;
+ asm volatile("swp %0,%2,[%3]"
+ : "=&r"(originalValue), "=m" (_q_value)
+ : "r"(newValue), "r"(&_q_value)
+ : "cc", "memory");
+ return originalValue;
+}
+
+#endif // Q_CC_RVCT
+
+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)
+{
+#ifndef QT_NO_ARM_EABI
+ register T *originalValue;
+ register T *newValue;
+ do {
+ originalValue = _q_value;
+ newValue = originalValue + valueToAdd;
+ } while (qt_atomic_eabi_cmpxchg_ptr(originalValue, newValue, &_q_value) != 0);
+ return originalValue;
+#else
+ int count = 0;
+ while (q_atomic_swp(&q_atomic_lock, ~0) != 0)
+ qt_atomic_yield(&count);
+ T *originalValue = (_q_value);
+ _q_value += valueToAdd;
+ q_atomic_swp(&q_atomic_lock, 0);
+ return originalValue;
+#endif
+}
+
+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_ARMV5_H