Fix the C++11 and GCC-atomic intrinsics when not using GCC
Both Clang and ICC complain about the use of those atomics when used with a forward-declared pointee. GCC doesn't, which makes me think it's a GCC bug. When using QBasicAtomicPointer<Foo> with these atomics, the _q_value member causes the instantiation of QAtomicOps<Foo>, which causes the instantiation of the regular member function QAtomicOps<Foo>::fetchAndAddRelaxed. The problem is that function takes a QAtomicAdditiveType<Foo>::AdditiveT as parameter, which requires sizeof(Foo). Clang 3.3 and ICC 14 correctly expand and complain. GCC 4.7-4.9 apparently don't. The fix is to apply the same trick we used for the other atomics: change all ops functions (including fetchAndAddRelaxed) to be member templates. That way, they can't be expanded until the actual use. Clang errors: qgenericatomic.h:73:33: error: invalid application of 'sizeof' to an incomplete type 'QMutexData' qatomic_gcc.h:136:48: note: in instantiation of template class 'QAtomicAdditiveType<QMutexData *>' requested here qbasicatomic.h:272:22: note: in instantiation of template class 'QAtomicOps<QMutexData *>' requested here ICC errors: qgenericatomic.h(73): error: incomplete type is not allowed detected during: instantiation of class "QAtomicAdditiveType<T *> [with T=QMutexData]" at line 111 of "qatomic_cxx11.h" instantiation of class "QAtomicOps<T> [with T=QMutexData *]" at line 272 of "qbasicatomic.h" Found-by: Tor Arne Change-Id: I9b10648cd47109a943b34a4c9926d77cd0c4fe12 Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com> Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
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@ -105,56 +105,56 @@ template<> struct QAtomicIntegerTraits<char32_t> { enum { IsInteger = 1 }; };
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#define Q_ATOMIC_INT64_FETCH_AND_STORE_IS_ALWAYS_NATIVE
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#define Q_ATOMIC_INT64_FETCH_AND_ADD_IS_ALWAYS_NATIVE
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template <typename T> struct QAtomicOps
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template <typename X> struct QAtomicOps
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{
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typedef std::atomic<T> Type;
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typedef typename QAtomicAdditiveType<T>::AdditiveT _AdditiveType;
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static const int AddScale = QAtomicAdditiveType<T>::AddScale;
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typedef std::atomic<X> Type;
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static inline
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T load(const Type &_q_value) Q_DECL_NOTHROW
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template <typename T> static inline
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T load(const std::atomic<T> &_q_value) Q_DECL_NOTHROW
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{
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return _q_value.load(std::memory_order_relaxed);
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}
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static inline
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T load(const volatile Type &_q_value) Q_DECL_NOTHROW
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template <typename T> static inline
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T load(const volatile std::atomic<T> &_q_value) Q_DECL_NOTHROW
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{
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return _q_value.load(std::memory_order_relaxed);
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}
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static inline
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T loadAcquire(const Type &_q_value) Q_DECL_NOTHROW
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template <typename T> static inline
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T loadAcquire(const std::atomic<T> &_q_value) Q_DECL_NOTHROW
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{
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return _q_value.load(std::memory_order_acquire);
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}
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static inline
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T loadAcquire(const volatile Type &_q_value) Q_DECL_NOTHROW
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template <typename T> static inline
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T loadAcquire(const volatile std::atomic<T> &_q_value) Q_DECL_NOTHROW
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{
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return _q_value.load(std::memory_order_acquire);
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}
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static inline
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void store(Type &_q_value, T newValue) Q_DECL_NOTHROW
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template <typename T> static inline
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void store(std::atomic<T> &_q_value, T newValue) Q_DECL_NOTHROW
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{
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_q_value.store(newValue, std::memory_order_relaxed);
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}
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static inline
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void storeRelease(Type &_q_value, T newValue) Q_DECL_NOTHROW
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template <typename T> static inline
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void storeRelease(std::atomic<T> &_q_value, T newValue) Q_DECL_NOTHROW
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{
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_q_value.store(newValue, std::memory_order_release);
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}
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static inline Q_DECL_CONSTEXPR bool isReferenceCountingNative() Q_DECL_NOTHROW { return true; }
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static inline Q_DECL_CONSTEXPR bool isReferenceCountingWaitFree() Q_DECL_NOTHROW { return false; }
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static inline bool ref(Type &_q_value)
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template <typename T>
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static inline bool ref(std::atomic<T> &_q_value)
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{
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return ++_q_value != 0;
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}
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static inline bool deref(Type &_q_value) Q_DECL_NOTHROW
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template <typename T>
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static inline bool deref(std::atomic<T> &_q_value) Q_DECL_NOTHROW
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{
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return --_q_value != 0;
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}
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@ -162,22 +162,25 @@ template <typename T> struct QAtomicOps
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static inline Q_DECL_CONSTEXPR bool isTestAndSetNative() Q_DECL_NOTHROW { return false; }
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static inline Q_DECL_CONSTEXPR bool isTestAndSetWaitFree() Q_DECL_NOTHROW { return false; }
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static
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template <typename T> static
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bool testAndSetRelaxed(Type &_q_value, T expectedValue, T newValue) Q_DECL_NOTHROW
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{
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return _q_value.compare_exchange_strong(expectedValue, newValue, std::memory_order_relaxed);
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}
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template <typename T>
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static bool testAndSetAcquire(Type &_q_value, T expectedValue, T newValue) Q_DECL_NOTHROW
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{
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return _q_value.compare_exchange_strong(expectedValue, newValue, std::memory_order_acquire);
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}
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template <typename T>
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static bool testAndSetRelease(Type &_q_value, T expectedValue, T newValue) Q_DECL_NOTHROW
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{
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return _q_value.compare_exchange_strong(expectedValue, newValue, std::memory_order_release);
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}
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template <typename T>
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static bool testAndSetOrdered(Type &_q_value, T expectedValue, T newValue) Q_DECL_NOTHROW
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{
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return _q_value.compare_exchange_strong(expectedValue, newValue, std::memory_order_acq_rel);
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@ -186,22 +189,26 @@ template <typename T> struct QAtomicOps
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static inline Q_DECL_CONSTEXPR bool isFetchAndStoreNative() Q_DECL_NOTHROW { return false; }
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static inline Q_DECL_CONSTEXPR bool isFetchAndStoreWaitFree() Q_DECL_NOTHROW { return false; }
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static T fetchAndStoreRelaxed(Type &_q_value, T newValue) Q_DECL_NOTHROW
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template <typename T>
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static T fetchAndStoreRelaxed(std::atomic<T> &_q_value, T newValue) Q_DECL_NOTHROW
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{
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return _q_value.exchange(newValue, std::memory_order_relaxed);
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}
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static T fetchAndStoreAcquire(Type &_q_value, T newValue) Q_DECL_NOTHROW
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template <typename T>
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static T fetchAndStoreAcquire(std::atomic<T> &_q_value, T newValue) Q_DECL_NOTHROW
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{
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return _q_value.exchange(newValue, std::memory_order_acquire);
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}
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static T fetchAndStoreRelease(Type &_q_value, T newValue) Q_DECL_NOTHROW
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template <typename T>
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static T fetchAndStoreRelease(std::atomic<T> &_q_value, T newValue) Q_DECL_NOTHROW
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{
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return _q_value.exchange(newValue, std::memory_order_release);
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}
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static T fetchAndStoreOrdered(Type &_q_value, T newValue) Q_DECL_NOTHROW
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template <typename T>
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static T fetchAndStoreOrdered(std::atomic<T> &_q_value, T newValue) Q_DECL_NOTHROW
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{
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return _q_value.exchange(newValue, std::memory_order_acq_rel);
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}
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@ -209,31 +216,31 @@ template <typename T> struct QAtomicOps
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static inline Q_DECL_CONSTEXPR bool isFetchAndAddNative() Q_DECL_NOTHROW { return false; }
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static inline Q_DECL_CONSTEXPR bool isFetchAndAddWaitFree() Q_DECL_NOTHROW { return false; }
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static
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T fetchAndAddRelaxed(Type &_q_value, _AdditiveType valueToAdd) Q_DECL_NOTHROW
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template <typename T> static inline
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T fetchAndAddRelaxed(std::atomic<T> &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW
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{
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return _q_value.fetch_add(valueToAdd * AddScale,
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return _q_value.fetch_add(valueToAdd * QAtomicAdditiveType<T>::AddScale,
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std::memory_order_relaxed);
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}
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static
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T fetchAndAddAcquire(Type &_q_value, _AdditiveType valueToAdd) Q_DECL_NOTHROW
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template <typename T> static inline
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T fetchAndAddAcquire(std::atomic<T> &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW
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{
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return _q_value.fetch_add(valueToAdd * AddScale,
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return _q_value.fetch_add(valueToAdd * QAtomicAdditiveType<T>::AddScale,
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std::memory_order_acquire);
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}
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static
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T fetchAndAddRelease(Type &_q_value, _AdditiveType valueToAdd) Q_DECL_NOTHROW
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template <typename T> static inline
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T fetchAndAddRelease(std::atomic<T> &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW
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{
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return _q_value.fetch_add(valueToAdd * AddScale,
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return _q_value.fetch_add(valueToAdd * QAtomicAdditiveType<T>::AddScale,
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std::memory_order_release);
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}
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static
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T fetchAndAddOrdered(Type &_q_value, _AdditiveType valueToAdd) Q_DECL_NOTHROW
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template <typename T> static inline
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T fetchAndAddOrdered(std::atomic<T> &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW
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{
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return _q_value.fetch_add(valueToAdd * AddScale,
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return _q_value.fetch_add(valueToAdd * QAtomicAdditiveType<T>::AddScale,
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std::memory_order_acq_rel);
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}
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};
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@ -75,16 +75,17 @@ template<> struct QAtomicIntegerTraits<char32_t> { enum { IsInteger = 1 }; };
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#define Q_ATOMIC_POINTER_FETCH_AND_STORE_IS_SOMETIMES_NATIVE
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#define Q_ATOMIC_POINTER_FETCH_AND_ADD_IS_SOMETIMES_NATIVE
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template <typename T> struct QAtomicOps: QGenericAtomicOps<QAtomicOps<T> >
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template <typename X> struct QAtomicOps: QGenericAtomicOps<QAtomicOps<X> >
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{
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// The GCC intrinsics all have fully-ordered memory semantics, so we define
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// only the xxxRelaxed functions. The exception is __sync_lock_and_test,
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// which has acquire semantics, so we need to define the Release and
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// Ordered versions too.
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typedef T Type;
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typedef X Type;
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#ifndef __ia64__
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template <typename T>
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static T loadAcquire(const T &_q_value) Q_DECL_NOTHROW
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{
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T tmp = _q_value;
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@ -92,6 +93,7 @@ template <typename T> struct QAtomicOps: QGenericAtomicOps<QAtomicOps<T> >
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return tmp;
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}
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template <typename T>
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static void storeRelease(T &_q_value, T newValue) Q_DECL_NOTHROW
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{
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__sync_synchronize();
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@ -101,28 +103,32 @@ template <typename T> struct QAtomicOps: QGenericAtomicOps<QAtomicOps<T> >
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static Q_DECL_CONSTEXPR bool isTestAndSetNative() Q_DECL_NOTHROW { return false; }
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static Q_DECL_CONSTEXPR bool isTestAndSetWaitFree() Q_DECL_NOTHROW { return false; }
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template <typename T>
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static bool testAndSetRelaxed(T &_q_value, T expectedValue, T newValue) Q_DECL_NOTHROW
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{
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return __sync_bool_compare_and_swap(&_q_value, expectedValue, newValue);
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}
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template <typename T>
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static T fetchAndStoreRelaxed(T &_q_value, T newValue) Q_DECL_NOTHROW
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{
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return __sync_lock_test_and_set(&_q_value, newValue);
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}
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template <typename T>
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static T fetchAndStoreRelease(T &_q_value, T newValue) Q_DECL_NOTHROW
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{
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__sync_synchronize();
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return __sync_lock_test_and_set(&_q_value, newValue);
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}
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template <typename T>
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static T fetchAndStoreOrdered(T &_q_value, T newValue) Q_DECL_NOTHROW
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{
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return fetchAndStoreRelease(_q_value, newValue);
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}
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static
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template <typename T> static
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T fetchAndAddRelaxed(T &_q_value, typename QAtomicAdditiveType<T>::AdditiveT valueToAdd) Q_DECL_NOTHROW
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{
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return __sync_fetch_and_add(&_q_value, valueToAdd * QAtomicAdditiveType<T>::AddScale);
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