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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the examples of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include <QtGui> |
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43 |
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44 #ifndef QT_NO_CONCURRENT |
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45 |
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46 using namespace QtConcurrent; |
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47 |
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48 const int iterations = 20; |
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49 |
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50 void spin(int &iteration) |
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51 { |
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52 const int work = 1000 * 1000 * 40; |
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53 volatile int v = 0; |
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54 for (int j = 0; j < work; ++j) |
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55 ++v; |
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56 |
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57 qDebug() << "iteration" << iteration << "in thread" << QThread::currentThreadId(); |
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58 } |
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59 |
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60 int main(int argc, char **argv) |
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61 { |
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62 QApplication app(argc, argv); |
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63 |
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64 // Prepare the vector. |
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65 QVector<int> vector; |
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66 for (int i = 0; i < iterations; ++i) |
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67 vector.append(i); |
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68 |
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69 // Create a progress dialog. |
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70 QProgressDialog dialog; |
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71 dialog.setLabelText(QString("Progressing using %1 thread(s)...").arg(QThread::idealThreadCount())); |
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72 |
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73 // Create a QFutureWatcher and conncect signals and slots. |
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74 QFutureWatcher<void> futureWatcher; |
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75 QObject::connect(&futureWatcher, SIGNAL(finished()), &dialog, SLOT(reset())); |
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76 QObject::connect(&dialog, SIGNAL(canceled()), &futureWatcher, SLOT(cancel())); |
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77 QObject::connect(&futureWatcher, SIGNAL(progressRangeChanged(int, int)), &dialog, SLOT(setRange(int, int))); |
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78 QObject::connect(&futureWatcher, SIGNAL(progressValueChanged(int)), &dialog, SLOT(setValue(int))); |
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79 |
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80 // Start the computation. |
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81 futureWatcher.setFuture(QtConcurrent::map(vector, spin)); |
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82 |
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83 // Display the dialog and start the event loop. |
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84 dialog.exec(); |
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85 |
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86 futureWatcher.waitForFinished(); |
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87 |
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88 // Query the future to check if was canceled. |
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89 qDebug() << "Canceled?" << futureWatcher.future().isCanceled(); |
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90 } |
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91 |
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92 #else |
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93 |
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94 int main() |
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95 { |
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96 qDebug() << "Qt Concurrent is not yet supported on this platform"; |
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97 } |
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98 |
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99 #endif |
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100 |