1 /****************************************************************************

     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the QtCore module of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

    27 **

    28 ** If you have questions regarding the use of this file, please contact

    29 ** Nokia at qt-info@nokia.com.

    30 **

    31 **

    32 **

    33 **

    34 **

    35 **

    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #ifndef QATOMIC_H

    43 #define QATOMIC_H

    44 

    45 #include <QtCore/qglobal.h>

    46 #include <QtCore/qbasicatomic.h>

    47 

    48 QT_BEGIN_HEADER

    49 

    50 QT_BEGIN_NAMESPACE

    51 

    52 QT_MODULE(Core)

    53 

    54 // High-level atomic integer operations

    55 class Q_CORE_EXPORT QAtomicInt : public QBasicAtomicInt

    56 {

    57 public:

    58     inline QAtomicInt(int value = 0)

    59     {

    60 #ifdef QT_ARCH_PARISC

    61         this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;

    62 #endif

    63         _q_value = value;

    64     }

    65     inline QAtomicInt(const QAtomicInt &other)

    66     {

    67 #ifdef QT_ARCH_PARISC

    68         this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;

    69 #endif

    70         _q_value = other._q_value;

    71     }

    72 

    73     inline QAtomicInt &operator=(int value)

    74     {

    75         (void) QBasicAtomicInt::operator=(value);

    76         return *this;

    77     }

    78 

    79     inline QAtomicInt &operator=(const QAtomicInt &other)

    80     {

    81         (void) QBasicAtomicInt::operator=(other);

    82         return *this;

    83     }

    84 

    85 #ifdef qdoc

    86     bool operator==(int value) const;

    87     bool operator!=(int value) const;

    88     bool operator!() const;

    89     operator int() const;

    90 

    91     static bool isReferenceCountingNative();

    92     static bool isReferenceCountingWaitFree();

    93 

    94     bool ref();

    95     bool deref();

    96 

    97     static bool isTestAndSetNative();

    98     static bool isTestAndSetWaitFree();

    99 

   100     bool testAndSetRelaxed(int expectedValue, int newValue);

   101     bool testAndSetAcquire(int expectedValue, int newValue);

   102     bool testAndSetRelease(int expectedValue, int newValue);

   103     bool testAndSetOrdered(int expectedValue, int newValue);

   104 

   105     static bool isFetchAndStoreNative();

   106     static bool isFetchAndStoreWaitFree();

   107 

   108     int fetchAndStoreRelaxed(int newValue);

   109     int fetchAndStoreAcquire(int newValue);

   110     int fetchAndStoreRelease(int newValue);

   111     int fetchAndStoreOrdered(int newValue);

   112 

   113     static bool isFetchAndAddNative();

   114     static bool isFetchAndAddWaitFree();

   115 

   116     int fetchAndAddRelaxed(int valueToAdd);

   117     int fetchAndAddAcquire(int valueToAdd);

   118     int fetchAndAddRelease(int valueToAdd);

   119     int fetchAndAddOrdered(int valueToAdd);

   120 #endif

   121 };

   122 

   123 // High-level atomic pointer operations

   124 template <typename T>

   125 class QAtomicPointer : public QBasicAtomicPointer<T>

   126 {

   127 public:

   128     inline QAtomicPointer(T *value = 0)

   129     {

   130 #ifdef QT_ARCH_PARISC

   131         this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;

   132 #endif

   133         QBasicAtomicPointer<T>::_q_value = value;

   134     }

   135     inline QAtomicPointer(const QAtomicPointer<T> &other)

   136     {

   137 #ifdef QT_ARCH_PARISC

   138         this->_q_lock[0] = this->_q_lock[1] = this->_q_lock[2] = this->_q_lock[3] = -1;

   139 #endif

   140         QBasicAtomicPointer<T>::_q_value = other._q_value;

   141     }

   142 

   143     inline QAtomicPointer<T> &operator=(T *value)

   144     {

   145         (void) QBasicAtomicPointer<T>::operator=(value);

   146         return *this;

   147     }

   148 

   149     inline QAtomicPointer<T> &operator=(const QAtomicPointer<T> &other)

   150     {

   151         (void) QBasicAtomicPointer<T>::operator=(other);

   152         return *this;

   153     }

   154 

   155 #ifdef qdoc

   156     bool operator==(T *value) const;

   157     bool operator!=(T *value) const;

   158     bool operator!() const;

   159     operator T *() const;

   160     T *operator->() const;

   161 

   162     static bool isTestAndSetNative();

   163     static bool isTestAndSetWaitFree();

   164 

   165     bool testAndSetRelaxed(T *expectedValue, T *newValue);

   166     bool testAndSetAcquire(T *expectedValue, T *newValue);

   167     bool testAndSetRelease(T *expectedValue, T *newValue);

   168     bool testAndSetOrdered(T *expectedValue, T *newValue);

   169 

   170     static bool isFetchAndStoreNative();

   171     static bool isFetchAndStoreWaitFree();

   172 

   173     T *fetchAndStoreRelaxed(T *newValue);

   174     T *fetchAndStoreAcquire(T *newValue);

   175     T *fetchAndStoreRelease(T *newValue);

   176     T *fetchAndStoreOrdered(T *newValue);

   177 

   178     static bool isFetchAndAddNative();

   179     static bool isFetchAndAddWaitFree();

   180 

   181     T *fetchAndAddRelaxed(qptrdiff valueToAdd);

   182     T *fetchAndAddAcquire(qptrdiff valueToAdd);

   183     T *fetchAndAddRelease(qptrdiff valueToAdd);

   184     T *fetchAndAddOrdered(qptrdiff valueToAdd);

   185 #endif

   186 };

   187 

   188 /*!

   189     This is a helper for the assignment operators of implicitly

   190     shared classes. Your assignment operator should look like this:

   191 

   192     \snippet doc/src/snippets/code/src.corelib.thread.qatomic.h 0

   193 */

   194 template <typename T>

   195 inline void qAtomicAssign(T *&d, T *x)

   196 {

   197     if (d == x)

   198         return;

   199     x->ref.ref();

   200     if (!d->ref.deref())

   201         delete d;

   202     d = x;

   203 }

   204 

   205 /*!

   206     This is a helper for the detach method of implicitly shared

   207     classes. Your private class needs a copy constructor which copies

   208     the members and sets the refcount to 1. After that, your detach

   209     function should look like this:

   210 

   211     \snippet doc/src/snippets/code/src.corelib.thread.qatomic.h 1

   212 */

   213 template <typename T>

   214 inline void qAtomicDetach(T *&d)

   215 {

   216     if (d->ref == 1)

   217         return;

   218     T *x = d;

   219     d = new T(*d);

   220     if (!x->ref.deref())

   221         delete x;

   222 }

   223 

   224 QT_END_NAMESPACE

   225 QT_END_HEADER

   226 

   227 #endif // QATOMIC_H