qatomic_i386.h

Go to the documentation of this file.

/****************************************************************************
**
** Copyright (C) 2010 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.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 module.
**
** 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 qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QATOMIC_I386_H
#define QATOMIC_I386_H

QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE

#define Q_ATOMIC_INT_REFERENCE_COUNTING_IS_ALWAYS_NATIVE
#define Q_ATOMIC_INT_REFERENCE_COUNTING_IS_WAIT_FREE

inline bool QBasicAtomicInt::isReferenceCountingNative()
{ return true; }
inline bool QBasicAtomicInt::isReferenceCountingWaitFree()
{ return true; }

#define Q_ATOMIC_INT_TEST_AND_SET_IS_ALWAYS_NATIVE
#define Q_ATOMIC_INT_TEST_AND_SET_IS_WAIT_FREE

inline bool QBasicAtomicInt::isTestAndSetNative()
{ return true; }
inline bool QBasicAtomicInt::isTestAndSetWaitFree()
{ return true; }

#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_ALWAYS_NATIVE
#define Q_ATOMIC_INT_FETCH_AND_ADD_IS_WAIT_FREE

inline bool QBasicAtomicInt::isFetchAndAddNative()
{ return true; }
inline bool QBasicAtomicInt::isFetchAndAddWaitFree()
{ return true; }

#define Q_ATOMIC_POINTER_TEST_AND_SET_IS_ALWAYS_NATIVE
#define Q_ATOMIC_POINTER_TEST_AND_SET_IS_WAIT_FREE

template <typename T>
Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isTestAndSetNative()
{ return true; }
template <typename T>
Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isTestAndSetWaitFree()
{ return true; }

#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_ALWAYS_NATIVE
#define Q_ATOMIC_POINTER_FETCH_AND_ADD_IS_WAIT_FREE

template <typename T>
Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddNative()
{ return true; }
template <typename T>
Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddWaitFree()
{ return true; }

#if defined(Q_CC_GNU) || defined(Q_CC_INTEL)

inline bool QBasicAtomicInt::ref()
{
    unsigned char ret;
    asm volatile("lock\n"
                 "incl %0\n"
                 "setne %1"
                 : "=m" (_q_value), "=qm" (ret)
                 : "m" (_q_value)
                 : "memory");
    return ret != 0;
}

inline bool QBasicAtomicInt::deref()
{
        unsigned char ret;
    asm volatile("lock\n"
                 "decl %0\n"
                 "setne %1"
                 : "=m" (_q_value), "=qm" (ret)
                 : "m" (_q_value)
                 : "memory");
    return ret != 0;
}

inline bool QBasicAtomicInt::testAndSetOrdered(int expectedValue, int newValue)
{
    unsigned char ret;
    asm volatile("lock\n"
                 "cmpxchgl %3,%2\n"
                 "sete %1\n"
                 : "=a" (newValue), "=qm" (ret), "+m" (_q_value)
                 : "r" (newValue), "0" (expectedValue)
                 : "memory");
    return ret != 0;
}

inline int QBasicAtomicInt::fetchAndStoreOrdered(int newValue)
{
    asm volatile("xchgl %0,%1"
                 : "=r" (newValue), "+m" (_q_value)
                 : "0" (newValue)
                 : "memory");
    return newValue;
}

inline int QBasicAtomicInt::fetchAndAddOrdered(int valueToAdd)
{
    asm volatile("lock\n"
                 "xaddl %0,%1"
                 : "=r" (valueToAdd), "+m" (_q_value)
                 : "0" (valueToAdd)
                 : "memory");
    return valueToAdd;
}

template <typename T>
Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetOrdered(T *expectedValue, T *newValue)
{
    unsigned char ret;
    asm volatile("lock\n"
                 "cmpxchgl %3,%2\n"
                 "sete %1\n"
                 : "=a" (newValue), "=qm" (ret), "+m" (_q_value)
                 : "r" (newValue), "0" (expectedValue)
                 : "memory");
    return ret != 0;
}

template <typename T>
Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreOrdered(T *newValue)
{
    asm volatile("xchgl %0,%1"
                 : "=r" (newValue), "+m" (_q_value)
                 : "0" (newValue)
                 : "memory");
    return newValue;
}

template <typename T>
Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddOrdered(qptrdiff valueToAdd)
{
    asm volatile("lock\n"
                 "xaddl %0,%1"
                 : "=r" (valueToAdd), "+m" (_q_value)
                 : "0" (valueToAdd * sizeof(T))
                 : "memory");
    return reinterpret_cast<T *>(valueToAdd);
}

#else

extern "C" {
    Q_CORE_EXPORT int q_atomic_test_and_set_int(volatile int *ptr, int expected, int newval);
    Q_CORE_EXPORT int q_atomic_test_and_set_ptr(volatile void *ptr, void *expected, void *newval);
    Q_CORE_EXPORT int q_atomic_increment(volatile int *ptr);
    Q_CORE_EXPORT int q_atomic_decrement(volatile int *ptr);
    Q_CORE_EXPORT int q_atomic_set_int(volatile int *ptr, int newval);
    Q_CORE_EXPORT void *q_atomic_set_ptr(volatile void *ptr, void *newval);
    Q_CORE_EXPORT int q_atomic_fetch_and_add_int(volatile int *ptr, int value);
    Q_CORE_EXPORT void *q_atomic_fetch_and_add_ptr(volatile void *ptr, int value);
} // extern "C"

inline bool QBasicAtomicInt::ref()
{
    return q_atomic_increment(&_q_value) != 0;
}

inline bool QBasicAtomicInt::deref()
{
    return q_atomic_decrement(&_q_value) != 0;
}

inline bool QBasicAtomicInt::testAndSetOrdered(int expectedValue, int newValue)
{
    return q_atomic_test_and_set_int(&_q_value, expectedValue, newValue) != 0;
}

inline int QBasicAtomicInt::fetchAndStoreOrdered(int newValue)
{
    return q_atomic_set_int(&_q_value, newValue);
}

inline int QBasicAtomicInt::fetchAndAddOrdered(int valueToAdd)
{
    return q_atomic_fetch_and_add_int(&_q_value, valueToAdd);
}

template <typename T>
Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetOrdered(T *expectedValue, T *newValue)
{
    return q_atomic_test_and_set_ptr(&_q_value, expectedValue, newValue);
}

template <typename T>
Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreOrdered(T *newValue)
{
    return reinterpret_cast<T *>(q_atomic_set_ptr(&_q_value, newValue));
}

template <typename T>
Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddOrdered(qptrdiff valueToAdd)
{
    return reinterpret_cast<T *>(q_atomic_fetch_and_add_ptr(&_q_value, valueToAdd * sizeof(T)));
}

#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);
}

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);
}

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);
}

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);
}

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);
}

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_I386_H