qexception.cpp

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1 /**************************************************************************** -

2 ** -

3 ** Copyright (C) 2015 The Qt Company Ltd. -

4 ** Contact: http://www.qt.io/licensing/ -

5 ** -

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

7 ** -

8 ** $QT_BEGIN_LICENSE:LGPL21$ -

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 http://www.qt.io/terms-conditions. For further -

15 ** information use the contact form at http://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 2.1 or version 3 as published by the Free -

20 ** Software Foundation and appearing in the file LICENSE.LGPLv21 and -

21 ** LICENSE.LGPLv3 included in the packaging of this file. Please review the -

22 ** following information to ensure the GNU Lesser General Public License -

23 ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and -

24 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. -

25 ** -

26 ** As a special exception, The Qt Company gives you certain additional -

27 ** rights. These rights are described in The Qt Company LGPL Exception -

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

29 ** -

30 ** $QT_END_LICENSE$ -

31 ** -

32 ****************************************************************************/ -

33 -

34 #include "qexception.h" -

35 #include "QtCore/qshareddata.h" -

36 -

37 #ifndef QT_NO_QFUTURE -

38 #ifndef QT_NO_EXCEPTIONS -

39 -

40 QT_BEGIN_NAMESPACE -

41 -

42 /*! -

43 \class QException -

44 \inmodule QtCore -

45 \brief The QException class provides a base class for exceptions that can transferred across threads. -

46 \since 5.0 -

47 -

48 Qt Concurrent supports throwing and catching exceptions across thread -

49 boundaries, provided that the exception inherit from QException -

50 and implement two helper functions: -

51 -

52 \snippet code/src_corelib_thread_qexception.cpp 0 -

53 -

54 QException subclasses must be thrown by value and -

55 caught by reference: -

56 -

57 \snippet code/src_corelib_thread_qexception.cpp 1 -

58 -

59 If you throw an exception that is not a subclass of QException, -

60 the Qt functions will throw a QUnhandledException -

61 in the receiver thread. -

62 -

63 When using QFuture, transferred exceptions will be thrown when calling the following functions: -

64 \list -

65 \li QFuture::waitForFinished() -

66 \li QFuture::result() -

67 \li QFuture::resultAt() -

68 \li QFuture::results() -

69 \endlist -

70 */ -

71 -

72 /*! -

73 \fn QException::raise() const -

74 In your QException subclass, reimplement raise() like this: -

75 -

76 \snippet code/src_corelib_thread_qexception.cpp 2 -

77 */ -

78 -

79 /*! -

80 \fn QException::clone() const -

81 In your QException subclass, reimplement clone() like this: -

82 -

83 \snippet code/src_corelib_thread_qexception.cpp 3 -

84 */ -

85 -

86 /*! -

87 \class QUnhandledException -

88 \inmodule QtCore -

89 -

90 \brief The UnhandledException class represents an unhandled exception in a worker thread. -

91 \since 5.0 -

92 -

93 If a worker thread throws an exception that is not a subclass of QException, -

94 the Qt functions will throw a QUnhandledException -

95 on the receiver thread side. -

96 -

97 Inheriting from this class is not supported. -

98 */ -

99 -

100 /*! -

101 \fn QUnhandledException::raise() const -

102 \internal -

103 */ -

104 -

105 /*! -

106 \fn QUnhandledException::clone() const -

107 \internal -

108 */ -

109 -

110 QException::~QException() -

111 #ifdef Q_COMPILER_NOEXCEPT -

112 noexcept -

113 #else -

114 throw() -

115 #endif -

116 { -

117 // must stay empty until ### Qt 6 -

118 } -

119 -

120 void QException::raise() const -

121 { -

122 QException e = *this; -

throw e;

executed 16 times by 4 tests: throw e;

Executed by:

tst_QFuture
tst_QtConcurrentMap
tst_QtConcurrentRun
tst_QtConcurrentThreadEngine

16

124 } -

125 -

126 QException *QException::clone() const -

127 { -

return new QException(*this);

executed 16 times by 4 tests: return new QException(*this);

Executed by:

tst_QFuture
tst_QtConcurrentMap
tst_QtConcurrentRun
tst_QtConcurrentThreadEngine

16

129 } -

130 -

131 QUnhandledException::~QUnhandledException() -

132 #ifdef Q_COMPILER_NOEXCEPT -

133 noexcept -

134 #else -

135 throw() -

136 #endif -

137 { -

138 // must stay empty until ### Qt 6 -

139 } -

140 -

141 void QUnhandledException::raise() const -

142 { -

143 QUnhandledException e = *this; -

throw e;

executed 3 times by 1 test: throw e;

Executed by:

tst_QtConcurrentThreadEngine

3

145 } -

146 -

147 QUnhandledException *QUnhandledException::clone() const -

148 { -

return new QUnhandledException(*this);

executed 3 times by 1 test: return new QUnhandledException(*this);

Executed by:

tst_QtConcurrentThreadEngine

3

150 } -

151 -

152 #ifndef Q_QDOC -

153 -

154 namespace QtPrivate { -

155 -

156 class Base : public QSharedData -

157 { -

158 public: -

159 Base(QException *exception) -

: exception(exception), hasThrown(false) { }

executed 21 times by 4 tests: end of block

Executed by:

tst_QFuture
tst_QtConcurrentMap
tst_QtConcurrentRun
tst_QtConcurrentThreadEngine

21

~Base() { delete exception; }

executed 21 times by 4 tests: end of block

Executed by:

tst_QFuture
tst_QtConcurrentMap
tst_QtConcurrentRun
tst_QtConcurrentThreadEngine

21

162 -

163 QException *exception; -

164 bool hasThrown; -

165 }; -

166 -

167 ExceptionHolder::ExceptionHolder(QException *exception) -

:

executed 209757 times by 12 tests: end of block

Executed by:

tst_QDebug
tst_QFuture
tst_QFutureSynchronizer
tst_QFutureWatcher
tst_QLockFile
tst_QMimeDatabase
tst_QUrl
tst_QtConcurrentFilter
tst_QtConcurrentIterateKernel
tst_QtConcurrentMap
tst_QtConcurrentRun
tst_QtConcurrentThreadEngine

base(exception ? new Base(exception) : Q_NULLPTR) {}

executed 209757 times by 12 tests: end of block

Executed by:

tst_QDebug
tst_QFuture
tst_QFutureSynchronizer
tst_QFutureWatcher
tst_QLockFile
tst_QMimeDatabase
tst_QUrl
tst_QtConcurrentFilter
tst_QtConcurrentIterateKernel
tst_QtConcurrentMap
tst_QtConcurrentRun
tst_QtConcurrentThreadEngine

209757

169 -

170 ExceptionHolder::ExceptionHolder(const ExceptionHolder &other) -

171 : base(other.base) -

{}

never executed: end of block

0

173 -

174 void ExceptionHolder::operator=(const ExceptionHolder &other) -

175 { -

176 base = other.base; -

}

executed 21 times by 4 tests: end of block

Executed by:

tst_QFuture
tst_QtConcurrentMap
tst_QtConcurrentRun
tst_QtConcurrentThreadEngine

21

178 -

179 ExceptionHolder::~ExceptionHolder() -

180 {} -

181 -

182 QException *ExceptionHolder::exception() const -

183 { -

if (!base)

!base	Description
TRUE	evaluated 233734 times by 12 tests Evaluated by: tst_QDebug tst_QFuture tst_QFutureSynchronizer tst_QFutureWatcher tst_QLockFile tst_QMimeDatabase tst_QUrl tst_QtConcurrentFilter tst_QtConcurrentIterateKernel tst_QtConcurrentMap tst_QtConcurrentRun tst_QtConcurrentThreadEngine
FALSE	evaluated 46 times by 4 tests Evaluated by: tst_QFuture tst_QtConcurrentMap tst_QtConcurrentRun tst_QtConcurrentThreadEngine

46-233734

return Q_NULLPTR;

executed 233734 times by 12 tests: return nullptr;

Executed by:

tst_QDebug
tst_QFuture
tst_QFutureSynchronizer
tst_QFutureWatcher
tst_QLockFile
tst_QMimeDatabase
tst_QUrl
tst_QtConcurrentFilter
tst_QtConcurrentIterateKernel
tst_QtConcurrentMap
tst_QtConcurrentRun
tst_QtConcurrentThreadEngine

233734

return base->exception;

executed 46 times by 4 tests: return base->exception;

Executed by:

tst_QFuture
tst_QtConcurrentMap
tst_QtConcurrentRun
tst_QtConcurrentThreadEngine

46

187 } -

188 -

189 void ExceptionStore::setException(const QException &e) -

190 { -

if (hasException() == false)

hasException() == false	Description
TRUE	evaluated 21 times by 4 tests Evaluated by: tst_QFuture tst_QtConcurrentMap tst_QtConcurrentRun tst_QtConcurrentThreadEngine
FALSE	evaluated 4 times by 1 test Evaluated by: tst_QtConcurrentThreadEngine

4-21

exceptionHolder = ExceptionHolder(e.clone());

executed 21 times by 4 tests: exceptionHolder = ExceptionHolder(e.clone());

Executed by:

tst_QFuture
tst_QtConcurrentMap
tst_QtConcurrentRun
tst_QtConcurrentThreadEngine

21

}

executed 25 times by 4 tests: end of block

Executed by:

tst_QFuture
tst_QtConcurrentMap
tst_QtConcurrentRun
tst_QtConcurrentThreadEngine

25

194 -

195 bool ExceptionStore::hasException() const -

196 { -

return (exceptionHolder.exception() != 0);

executed 233759 times by 12 tests: return (exceptionHolder.exception() != 0);

Executed by:

tst_QDebug
tst_QFuture
tst_QFutureSynchronizer
tst_QFutureWatcher
tst_QLockFile
tst_QMimeDatabase
tst_QUrl
tst_QtConcurrentFilter
tst_QtConcurrentIterateKernel
tst_QtConcurrentMap
tst_QtConcurrentRun
tst_QtConcurrentThreadEngine

233759

198 } -

199 -

200 ExceptionHolder ExceptionStore::exception() -

201 { -

return exceptionHolder;

never executed: return exceptionHolder;

0

203 } -

204 -

205 void ExceptionStore::throwPossibleException() -

206 { -

if (hasException() ) {

hasException()	Description
TRUE	evaluated 21 times by 4 tests Evaluated by: tst_QFuture tst_QtConcurrentMap tst_QtConcurrentRun tst_QtConcurrentThreadEngine
FALSE	evaluated 233713 times by 12 tests Evaluated by: tst_QDebug tst_QFuture tst_QFutureSynchronizer tst_QFutureWatcher tst_QLockFile tst_QMimeDatabase tst_QUrl tst_QtConcurrentFilter tst_QtConcurrentIterateKernel tst_QtConcurrentMap tst_QtConcurrentRun tst_QtConcurrentThreadEngine

21-233713

208 exceptionHolder.base->hasThrown = true; -

209 exceptionHolder.exception()->raise(); -

}

never executed: end of block

0

}

executed 233713 times by 12 tests: end of block

Executed by:

tst_QDebug
tst_QFuture
tst_QFutureSynchronizer
tst_QFutureWatcher
tst_QLockFile
tst_QMimeDatabase
tst_QUrl
tst_QtConcurrentFilter
tst_QtConcurrentIterateKernel
tst_QtConcurrentMap
tst_QtConcurrentRun
tst_QtConcurrentThreadEngine

233713

212 -

bool ExceptionStore::hasThrown() const { return exceptionHolder.base->hasThrown; }

never executed: return exceptionHolder.base->hasThrown;

0

214 -

215 } // namespace QtPrivate -

216 -

217 #endif //Q_QDOC -

218 -

219 QT_END_NAMESPACE -

220 -

221 #endif // QT_NO_EXCEPTIONS -

222 #endif // QT_NO_QFUTURE -

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