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Thread: memory leaks

  1. 5th March 2008, 07:48 #1
    Fastman
    Fastman is offline Intermediate user
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    BY.Minsk
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    Qt products
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    Unhappy memory leaks

    This is log VLD:

    Qt Code: 
    1. WARNING: Visual Leak Detector detected memory leaks!
    2. ---------- Block 126 at 0x00B55388: 8 bytes ----------
    3.   Call Stack:
    4.     d:\project_ispa\ank_source\hsm_ank\hsm\server.cpp (47): Server::TimerShot
    5.     d:\project_ispa\ank_source\hsm_ank\hsm\generatedfiles\debug\moc_server.cpp (67): Server::qt_metacall
    6.     d:\qt4_4\src\corelib\kernel\qobject.cpp (3187): QMetaObject::activate
    7.     d:\qt4_4\src\corelib\kernel\qobject.cpp (3257): QMetaObject::activate
    8.     d:\qt4_4\src\corelib\tmp\moc\debug_shared\moc_qtimer.cpp (126): QTimer::timeout
    9.     d:\qt4_4\src\corelib\kernel\qtimer.cpp (258): QTimer::timerEvent
    10.     d:\qt4_4\src\corelib\kernel\qobject.cpp (1126): QObject::event
    11.     d:\qt4_4\src\gui\kernel\qapplication.cpp (3770): QApplicationPrivate::notify_helper
    12.     d:\qt4_4\src\gui\kernel\qapplication.cpp (3360): QApplication::notify
    13.     d:\qt4_4\src\corelib\kernel\qcoreapplication.cpp (578): QCoreApplication::notifyInternal
    14.     d:\qt4_4\src\corelib\kernel\qcoreapplication.h (205): QCoreApplication::sendEvent
    15.     d:\qt4_4\src\corelib\kernel\qeventdispatcher_win.cpp (500): qt_internal_proc
    16.     0x7E368724 (File and line number not available): GetDC
    17.     0x7E368806 (File and line number not available): GetDC
    18.     0x7E3689BD (File and line number not available): GetWindowLongW
    19.     0x7E368A00 (File and line number not available): DispatchMessageW
    20.     d:\qt4_4\src\corelib\kernel\qeventdispatcher_win.cpp (746): QEventDispatcherWin32::processEvents
    21.     d:\qt4_4\src\gui\kernel\qapplication_win.cpp (1078): QGuiEventDispatcherWin32::processEvents
    22.     d:\qt4_4\src\corelib\kernel\qeventloop.cpp (140): QEventLoop::processEvents
    23.     d:\qt4_4\src\corelib\kernel\qeventloop.cpp (186): QEventLoop::exec
    24.     d:\qt4_4\src\corelib\kernel\qcoreapplication.cpp (830): QCoreApplication::exec
    25.     d:\qt4_4\src\gui\kernel\qapplication.cpp (3299): QApplication::exec
    26.     d:\project_ispa\ank_source\hsm_ank\hsm\main.cpp (26): main
    27.     d:\qt4_4\src\winmain\qtmain_win.cpp (133): WinMain
    28.     f:\rtm\vctools\crt_bld\self_x86\crt\src\crtexe.c (578): __tmainCRTStartup
    29.     f:\rtm\vctools\crt_bld\self_x86\crt\src\crtexe.c (403): WinMainCRTStartup
    30.     0x7C816FF7 (File and line number not available): RegisterWaitForInputIdle
    31.   Data:
    32.     48 19 21 67    00 00 00 00                                   H.!g.... ........
    33.  
    34. ---------- Block 198 at 0x00B63FE8: 8 bytes ----------
    35.   Call Stack:
    36.     d:\project_ispa\ank_source\hsm_ank\hsm\server.cpp (47): Server::TimerShot
    37.     d:\project_ispa\ank_source\hsm_ank\hsm\generatedfiles\debug\moc_server.cpp (67): Server::qt_metacall
    38.     d:\qt4_4\src\corelib\kernel\qobject.cpp (3187): QMetaObject::activate
    39.     d:\qt4_4\src\corelib\kernel\qobject.cpp (3257): QMetaObject::activate
    40.     d:\qt4_4\src\corelib\tmp\moc\debug_shared\moc_qtimer.cpp (126): QTimer::timeout
    41.     d:\qt4_4\src\corelib\kernel\qtimer.cpp (258): QTimer::timerEvent
    42.     d:\qt4_4\src\corelib\kernel\qobject.cpp (1126): QObject::event
    43.     d:\qt4_4\src\gui\kernel\qapplication.cpp (3770): QApplicationPrivate::notify_helper
    44.     d:\qt4_4\src\gui\kernel\qapplication.cpp (3360): QApplication::notify
    45.     d:\qt4_4\src\corelib\kernel\qcoreapplication.cpp (578): QCoreApplication::notifyInternal
    46.     d:\qt4_4\src\corelib\kernel\qcoreapplication.h (205): QCoreApplication::sendEvent
    47.     d:\qt4_4\src\corelib\kernel\qeventdispatcher_win.cpp (500): qt_internal_proc
    48.     0x7E368724 (File and line number not available): GetDC
    49.     0x7E368806 (File and line number not available): GetDC
    50.     0x7E3689BD (File and line number not available): GetWindowLongW
    51.     0x7E368A00 (File and line number not available): DispatchMessageW
    52.     d:\qt4_4\src\corelib\kernel\qeventdispatcher_win.cpp (746): QEventDispatcherWin32::processEvents
    53.     d:\qt4_4\src\gui\kernel\qapplication_win.cpp (1078): QGuiEventDispatcherWin32::processEvents
    54.     d:\qt4_4\src\corelib\kernel\qeventloop.cpp (140): QEventLoop::processEvents
    55.     d:\qt4_4\src\corelib\kernel\qeventloop.cpp (186): QEventLoop::exec
    56.     d:\qt4_4\src\corelib\kernel\qcoreapplication.cpp (830): QCoreApplication::exec
    57.     d:\qt4_4\src\gui\kernel\qapplication.cpp (3299): QApplication::exec
    58.     d:\project_ispa\ank_source\hsm_ank\hsm\main.cpp (26): main
    59.     d:\qt4_4\src\winmain\qtmain_win.cpp (133): WinMain
    60.     f:\rtm\vctools\crt_bld\self_x86\crt\src\crtexe.c (578): __tmainCRTStartup
    61.     f:\rtm\vctools\crt_bld\self_x86\crt\src\crtexe.c (403): WinMainCRTStartup
    62.     0x7C816FF7 (File and line number not available): RegisterWaitForInputIdle
    63.   Data:
    64.     48 19 21 67    00 00 00 00                                   H.!g.... ........
    65.  
    66. ---------- Block 131 at 0x00BF27A8: 12 bytes ----------
    67.   Call Stack:
    68.     d:\project_ispa\ank_source\hsm_ank\hsm\server.cpp (38): Server::incomingConnection
    69.     d:\qt4_4\src\network\socket\qtcpserver.cpp (185): QTcpServerPrivate::readNotification
    70.     d:\qt4_4\src\network\socket\qabstractsocketengine.cpp (136): QAbstractSocketEngine::readNotification
    71.     d:\qt4_4\src\network\socket\qnativesocketengine.cpp (985): QReadNotifier::event
    72.     d:\qt4_4\src\gui\kernel\qapplication.cpp (3770): QApplicationPrivate::notify_helper
    73.     d:\qt4_4\src\gui\kernel\qapplication.cpp (3360): QApplication::notify
    74.     d:\qt4_4\src\corelib\kernel\qcoreapplication.cpp (578): QCoreApplication::notifyInternal
    75.     d:\qt4_4\src\corelib\kernel\qcoreapplication.h (205): QCoreApplication::sendEvent
    76.     d:\qt4_4\src\corelib\kernel\qeventdispatcher_win.cpp (461): qt_internal_proc
    77.     0x7E368724 (File and line number not available): GetDC
    78.     0x7E368806 (File and line number not available): GetDC
    79.     0x7E3689BD (File and line number not available): GetWindowLongW
    80.     0x7E368A00 (File and line number not available): DispatchMessageW
    81.     d:\qt4_4\src\corelib\kernel\qeventdispatcher_win.cpp (746): QEventDispatcherWin32::processEvents
    82.     d:\qt4_4\src\gui\kernel\qapplication_win.cpp (1078): QGuiEventDispatcherWin32::processEvents
    83.     d:\qt4_4\src\corelib\kernel\qeventloop.cpp (140): QEventLoop::processEvents
    84.     d:\qt4_4\src\corelib\kernel\qeventloop.cpp (186): QEventLoop::exec
    85.     d:\qt4_4\src\corelib\kernel\qcoreapplication.cpp (830): QCoreApplication::exec
    86.     d:\qt4_4\src\gui\kernel\qapplication.cpp (3299): QApplication::exec
    87.     d:\project_ispa\ank_source\hsm_ank\hsm\main.cpp (26): main
    88.     d:\qt4_4\src\winmain\qtmain_win.cpp (133): WinMain
    89.     f:\rtm\vctools\crt_bld\self_x86\crt\src\crtexe.c (578): __tmainCRTStartup
    90.     f:\rtm\vctools\crt_bld\self_x86\crt\src\crtexe.c (403): WinMainCRTStartup
    91.     0x7C816FF7 (File and line number not available): RegisterWaitForInputIdle
    92.   Data:
    93.     48 19 21 67    00 00 00 00    C4 1D 00 00                    H.!g.... ........
    94.  
    95. ...
    96. Visual Leak Detector detected 15 memory leaks.
    97. Visual Leak Detector is now exiting.
    98. The program '[3596] HSM.exe: Native' has exited with code 0 (0x0).
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    My code:

    Qt Code: 
    1. Server::Server(QObject *parent):QTcpServer(parent)
    2. {
    3. 	if (!listen(QHostAddress::Any, 1718)) 
    4. 	{
    5. 		return;
    6. 	}
    7. 	if(!db.CheckDbState())
    8. 	{
    9. 		db.CloseDB();
    10. 	}
    11. 	db.CloseDB();
    12. 	m_pTimer = new QTimer(this);
    13. 	connect(m_pTimer, SIGNAL(timeout()), this, SLOT(TimerShot()));
    14. 	m_pTimer->start(5000);
    15. }
    16.  
    17. Server::~Server()
    18. {
    19. 	if (m_pTimer != NULL)
    20. 		delete (m_pTimer);
    21. }
    22.  
    23. void Server::incomingConnection(int socketDescriptor)
    24. {
    25. 	thread = new FortuneThread(socketDescriptor,this);
    26. 	thread->start();	
    27. }
    28.  
    29. void Server::TimerShot()
    30. {
    31.  
    32. 	WThread = new CWorkThread(this);
    33. 	WThread->start();
    34. }
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    Qt Code: 
    1. class Server : public QTcpServer
    2. {
    3.     Q_OBJECT
    4.  
    5.  
    6. public:
    7.  
    8.     Server(QObject *parent = 0);
    9.    ~Server();
    10.  
    11. protected:
    12.  
    13.     void incomingConnection(int socketDescriptor);
    14.  
    15. 	db_work db;
    16. 	FortuneThread *thread;
    17. 	CWorkThread   *WThread;
    18. 	QTimer        *m_pTimer;
    19.  
    20. private slots:
    21. 	void TimerShot();
    22. };
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    wtf ???
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  2. 5th March 2008, 08:00 #2
    Tiansen
    Tiansen is offline Intermediate user
    Join Date
    Feb 2008
    Posts
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    Qt products
    Qt4
    Platforms
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    Default Re: memory leaks

    I think it is because you always create a new CWorkThread instance inside TimerShot() function and you never delete old instance.
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