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# qatomic.h

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    00001 /****************************************************************************
    00002 **
    00003 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
    00004 ** All rights reserved.
    00005 ** Contact: Nokia Corporation (qt-info@nokia.com)
    00006 **
    00007 ** This file is part of the QtCore module of the Qt Toolkit.
    00008 **
    00009 ** $QT_BEGIN_LICENSE:LGPL$
    00010 ** Commercial Usage
    00011 ** Licensees holding valid Qt Commercial licenses may use this file in
    00012 ** accordance with the Qt Commercial License Agreement provided with the
    00013 ** Software or, alternatively, in accordance with the terms contained in
    00014 ** a written agreement between you and Nokia.
    00015 **
    00016 ** GNU Lesser General Public License Usage
    00017 ** Alternatively, this file may be used under the terms of the GNU Lesser
    00018 ** General Public License version 2.1 as published by the Free Software
    00019 ** Foundation and appearing in the file LICENSE.LGPL included in the
    00020 ** packaging of this file.  Please review the following information to
    00021 ** ensure the GNU Lesser General Public License version 2.1 requirements
    00022 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    00023 **
    00024 ** In addition, as a special exception, Nokia gives you certain additional
    00025 ** rights.  These rights are described in the Nokia Qt LGPL Exception
    00026 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this module.
    00027 **
    00028 ** GNU General Public License Usage
    00029 ** Alternatively, this file may be used under the terms of the GNU
    00030 ** General Public License version 3.0 as published by the Free Software
    00031 ** Foundation and appearing in the file LICENSE.GPL included in the
    00032 ** packaging of this file.  Please review the following information to
    00033 ** ensure the GNU General Public License version 3.0 requirements will be
    00034 ** met: http://www.gnu.org/copyleft/gpl.html.
    00035 **
    00036 ** If you have questions regarding the use of this file, please contact
    00037 ** Nokia at qt-info@nokia.com.
    00038 ** $QT_END_LICENSE$
    00039 **
    00040 ****************************************************************************/
    00041
    00042 #ifndef QATOMIC_H
    00043 #define QATOMIC_H
    00044
    00045 #include <QtCore/qglobal.h>
    00046 #include <QtCore/qbasicatomic.h>
    00047
    00048 QT_BEGIN_HEADER
    00049
    00050 QT_BEGIN_NAMESPACE
    00051
    00052 QT_MODULE(Core)
    00053
    00054 // High-level atomic integer operations
    00055 class Q_CORE_EXPORT QAtomicInt : public QBasicAtomicInt
    00056 {
    00057 public:
    00058     inline QAtomicInt(int value = 0)
    00059     {
    00060 #ifdef QT_ARCH_PARISC
    00061         this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;
    00062 #endif
    00063         _q_value = value;
    00064     }
    00065     inline QAtomicInt(const QAtomicInt &other)
    00066     {
    00067 #ifdef QT_ARCH_PARISC
    00068         this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;
    00069 #endif
    00070         _q_value = other._q_value;
    00071     }
    00072
    00073     inline QAtomicInt &operator=(int value)
    00074     {
    00075         (void) QBasicAtomicInt::operator=(value);
    00076         return *this;
    00077     }
    00078
    00079     inline QAtomicInt &operator=(const QAtomicInt &other)
    00080     {
    00081         (void) QBasicAtomicInt::operator=(other);
    00082         return *this;
    00083     }
    00084
    00085 #ifdef qdoc
    00086     bool operator==(int value) const;
    00087     bool operator!=(int value) const;
    00088     bool operator!() const;
    00089     operator int() const;
    00090
    00091     static bool isReferenceCountingNative();
    00092     static bool isReferenceCountingWaitFree();
    00093
    00094     bool ref();
    00095     bool deref();
    00096
    00097     static bool isTestAndSetNative();
    00098     static bool isTestAndSetWaitFree();
    00099
    00100     bool testAndSetRelaxed(int expectedValue, int newValue);
    00101     bool testAndSetAcquire(int expectedValue, int newValue);
    00102     bool testAndSetRelease(int expectedValue, int newValue);
    00103     bool testAndSetOrdered(int expectedValue, int newValue);
    00104
    00105     static bool isFetchAndStoreNative();
    00106     static bool isFetchAndStoreWaitFree();
    00107
    00108     int fetchAndStoreRelaxed(int newValue);
    00109     int fetchAndStoreAcquire(int newValue);
    00110     int fetchAndStoreRelease(int newValue);
    00111     int fetchAndStoreOrdered(int newValue);
    00112
    00113     static bool isFetchAndAddNative();
    00114     static bool isFetchAndAddWaitFree();
    00115
    00116     int fetchAndAddRelaxed(int valueToAdd);
    00117     int fetchAndAddAcquire(int valueToAdd);
    00118     int fetchAndAddRelease(int valueToAdd);
    00119     int fetchAndAddOrdered(int valueToAdd);
    00120 #endif
    00121 };
    00122
    00123 // High-level atomic pointer operations
    00124 template <typename T>
    00125 class QAtomicPointer : public QBasicAtomicPointer<T>
    00126 {
    00127 public:
    00128     inline QAtomicPointer(T *value = 0)
    00129     {
    00130 #ifdef QT_ARCH_PARISC
    00131         this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;
    00132 #endif
    00133         QBasicAtomicPointer<T>::_q_value = value;
    00134     }
    00135     inline QAtomicPointer(const QAtomicPointer<T> &other)
    00136     {
    00137 #ifdef QT_ARCH_PARISC
    00138         this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;
    00139 #endif
    00140         QBasicAtomicPointer<T>::_q_value = other._q_value;
    00141     }
    00142
    00143     inline QAtomicPointer<T> &operator=(T *value)
    00144     {
    00145         (void) QBasicAtomicPointer<T>::operator=(value);
    00146         return *this;
    00147     }
    00148
    00149     inline QAtomicPointer<T> &operator=(const QAtomicPointer<T> &other)
    00150     {
    00151         (void) QBasicAtomicPointer<T>::operator=(other);
    00152         return *this;
    00153     }
    00154
    00155 #ifdef qdoc
    00156     bool operator==(T *value) const;
    00157     bool operator!=(T *value) const;
    00158     bool operator!() const;
    00159     operator T *() const;
    00160     T *operator->() const;
    00161
    00162     static bool isTestAndSetNative();
    00163     static bool isTestAndSetWaitFree();
    00164
    00165     bool testAndSetRelaxed(T *expectedValue, T *newValue);
    00166     bool testAndSetAcquire(T *expectedValue, T *newValue);
    00167     bool testAndSetRelease(T *expectedValue, T *newValue);
    00168     bool testAndSetOrdered(T *expectedValue, T *newValue);
    00169
    00170     static bool isFetchAndStoreNative();
    00171     static bool isFetchAndStoreWaitFree();
    00172
    00173     T *fetchAndStoreRelaxed(T *newValue);
    00174     T *fetchAndStoreAcquire(T *newValue);
    00175     T *fetchAndStoreRelease(T *newValue);
    00176     T *fetchAndStoreOrdered(T *newValue);
    00177
    00178     static bool isFetchAndAddNative();
    00179     static bool isFetchAndAddWaitFree();
    00180
    00181     T *fetchAndAddRelaxed(qptrdiff valueToAdd);
    00182     T *fetchAndAddAcquire(qptrdiff valueToAdd);
    00183     T *fetchAndAddRelease(qptrdiff valueToAdd);
    00184     T *fetchAndAddOrdered(qptrdiff valueToAdd);
    00185 #endif
    00186 };
    00187
    00194 template <typename T>
    00195 inline void qAtomicAssign(T *&d, T *x)
    00196 {
    00197     if (d == x)
    00198         return;
    00199     x->ref.ref();
    00200     if (!d->ref.deref())
    00201         delete d;
    00202     d = x;
    00203 }
    00204
    00213 template <typename T>
    00214 inline void qAtomicDetach(T *&d)
    00215 {
    00216     if (d->ref == 1)
    00217         return;
    00218     T *x = d;
    00219     d = new T(*d);
    00220     if (!x->ref.deref())
    00221         delete x;
    00222 }
    00223
    00224 QT_END_NAMESPACE
    00225 QT_END_HEADER
    00226
    00227 #endif // QATOMIC_H