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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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
|