1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2016 The Qt Company Ltd. 4 ** Contact: https://www.qt.io/licensing/ 5 ** 6 ** This file is part of the QtConcurrent module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see https://www.qt.io/terms-conditions. For further 15 ** information use the contact form at https://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 3 as published by the Free Software 20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the 21 ** packaging of this file. Please review the following information to 22 ** ensure the GNU Lesser General Public License version 3 requirements 23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. 24 ** 25 ** GNU General Public License Usage 26 ** Alternatively, this file may be used under the terms of the GNU 27 ** General Public License version 2.0 or (at your option) the GNU General 28 ** Public license version 3 or any later version approved by the KDE Free 29 ** Qt Foundation. The licenses are as published by the Free Software 30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 31 ** included in the packaging of this file. Please review the following 32 ** information to ensure the GNU General Public License requirements will 33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and 34 ** https://www.gnu.org/licenses/gpl-3.0.html. 35 ** 36 ** $QT_END_LICENSE$ 37 ** 38 ****************************************************************************/ 39 40 #ifndef QTCONCURRENT_RUNBASE_H 41 #define QTCONCURRENT_RUNBASE_H 42 43 #include <QtConcurrent/qtconcurrent_global.h> 44 45 #ifndef QT_NO_CONCURRENT 46 47 #include <QtCore/qfuture.h> 48 #include <QtCore/qrunnable.h> 49 #include <QtCore/qthreadpool.h> 50 51 QT_BEGIN_NAMESPACE 52 53 54 #ifndef Q_QDOC 55 56 namespace QtConcurrent { 57 58 template <typename T> 59 struct SelectSpecialization 60 { 61 template <class Normal, class Void> 62 struct Type { typedef Normal type; }; 63 }; 64 65 template <> 66 struct SelectSpecialization<void> 67 { 68 template <class Normal, class Void> 69 struct Type { typedef Void type; }; 70 }; 71 72 template <typename T> 73 class RunFunctionTaskBase : public QFutureInterface<T> , public QRunnable 74 { 75 public: 76 QFuture<T> start() 77 { 78 return start(QThreadPool::globalInstance()); 79 } 80 81 QFuture<T> start(QThreadPool *pool) 82 { 83 this->setThreadPool(pool); 84 this->setRunnable(this); 85 this->reportStarted(); 86 QFuture<T> theFuture = this->future(); 87 pool->start(this, /*m_priority*/ 0); 88 return theFuture; 89 } 90 91 void run() override {} 92 virtual void runFunctor() = 0; 93 }; 94 95 template <typename T> 96 class RunFunctionTask : public RunFunctionTaskBase<T> 97 { 98 public: 99 void run() override 100 { 101 if (this->isCanceled()) { 102 this->reportFinished(); 103 return; 104 } 105 #ifndef QT_NO_EXCEPTIONS 106 try { 107 #endif 108 this->runFunctor(); 109 #ifndef QT_NO_EXCEPTIONS 110 } catch (QException &e) { 111 QFutureInterface<T>::reportException(e); 112 } catch (...) { 113 QFutureInterface<T>::reportException(QUnhandledException()); 114 } 115 #endif 116 117 this->reportResult(result); 118 this->reportFinished(); 119 } 120 T result; 121 }; 122 123 template <> 124 class RunFunctionTask<void> : public RunFunctionTaskBase<void> 125 { 126 public: 127 void run() override 128 { 129 if (this->isCanceled()) { 130 this->reportFinished(); 131 return; 132 } 133 #ifndef QT_NO_EXCEPTIONS 134 try { 135 #endif 136 this->runFunctor(); 137 #ifndef QT_NO_EXCEPTIONS 138 } catch (QException &e) { 139 QFutureInterface<void>::reportException(e); 140 } catch (...) { 141 QFutureInterface<void>::reportException(QUnhandledException()); 142 } 143 #endif 144 this->reportFinished(); 145 } 146 }; 147 148 } //namespace QtConcurrent 149 150 #endif //Q_QDOC 151 152 QT_END_NAMESPACE 153 154 #endif // QT_NO_CONCURRENT 155 156 #endif 157