qatomic_arm.h
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- /****************************************************************************
- **
- ** Copyright (C) 2008 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.
- **
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- ** accordance with the Qt Commercial License Agreement provided with the
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- **
- **
- ** GNU General Public License Usage
- ** Alternatively, this file may be used under the terms of the GNU
- ** General Public License versions 2.0 or 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
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- ** exception, Nokia gives you certain additional rights. These rights
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- #ifndef QATOMIC_ARM_H
- #define QATOMIC_ARM_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; }
- extern Q_CORE_EXPORT char q_atomic_lock;
- Q_CORE_EXPORT void qt_atomic_yield(int *);
- 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;
- }
- // Reference counting
- inline bool QBasicAtomicInt::ref()
- {
- 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;
- }
- inline bool QBasicAtomicInt::deref()
- {
- 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;
- }
- // Test and set for integers
- inline bool QBasicAtomicInt::testAndSetOrdered(int expectedValue, int newValue)
- {
- 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;
- }
- 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 originalValue;
- asm volatile("swp %0,%2,[%3]"
- : "=&r"(originalValue), "=m" (_q_value)
- : "r"(newValue), "r"(&_q_value)
- : "cc", "memory");
- 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 (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;
- }
- 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 (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;
- }
- 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)
- {
- T *originalValue;
- asm volatile("swp %0,%2,[%3]"
- : "=&r"(originalValue), "=m" (_q_value)
- : "r"(newValue), "r"(&_q_value)
- : "cc", "memory");
- 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 (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;
- }
- 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_ARM_H