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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2010 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 documentation 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 <QCache> |
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43 #include <QMutex> |
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44 #include <QThreadStorage> |
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45 |
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46 #include "threads.h" |
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47 |
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48 //! [0] |
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49 void MyThread::run() |
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50 //! [0] //! [1] |
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51 { |
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52 //! [1] //! [2] |
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53 } |
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54 //! [2] |
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55 |
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56 #define Counter ReentrantCounter |
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57 |
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58 //! [3] |
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59 class Counter |
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60 //! [3] //! [4] |
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61 { |
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62 public: |
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63 Counter() { n = 0; } |
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64 |
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65 void increment() { ++n; } |
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66 void decrement() { --n; } |
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67 int value() const { return n; } |
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68 |
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69 private: |
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70 int n; |
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71 }; |
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72 //! [4] |
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73 |
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74 #undef Counter |
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75 #define Counter ThreadSafeCounter |
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76 |
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77 //! [5] |
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78 class Counter |
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79 //! [5] //! [6] |
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80 { |
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81 public: |
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82 Counter() { n = 0; } |
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83 |
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84 void increment() { QMutexLocker locker(&mutex); ++n; } |
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85 void decrement() { QMutexLocker locker(&mutex); --n; } |
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86 int value() const { QMutexLocker locker(&mutex); return n; } |
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87 |
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88 private: |
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89 mutable QMutex mutex; |
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90 int n; |
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91 }; |
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92 //! [6] |
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93 |
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94 typedef int SomeClass; |
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95 |
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96 //! [7] |
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97 QThreadStorage<QCache<QString, SomeClass> *> caches; |
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98 |
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99 void cacheObject(const QString &key, SomeClass *object) |
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100 //! [7] //! [8] |
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101 { |
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102 if (!caches.hasLocalData()) |
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103 caches.setLocalData(new QCache<QString, SomeClass>); |
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104 |
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105 caches.localData()->insert(key, object); |
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106 } |
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107 |
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108 void removeFromCache(const QString &key) |
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109 //! [8] //! [9] |
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110 { |
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111 if (!caches.hasLocalData()) |
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112 return; |
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113 |
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114 caches.localData()->remove(key); |
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115 } |
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116 //! [9] |
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117 |
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118 int main() |
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119 { |
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120 return 0; |
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121 } |