Hi, With this approach, the object will no longer be deleted at program exit, right? So there can be no crash on deletion anymore. - Michael. From: interest-bounces+sue=sf.mpg...@qt-project.org [mailto:interest-bounces+sue=sf.mpg...@qt-project.org] On Behalf Of Nuno Santos Sent: Wednesday, January 07, 2015 1:16 PM To: Igor Mironchik Cc: Interests Qt Subject: Re: [Interest] Advice on random program finish crash Hi, I have made the following modification and it seems not crashing anymore: static Manager* gManager = 0; Manager* Manager::sharedManager() { QMutexLocker lock(&managerMutex); if (!gManager) { gManager = new Manager(); } return gManager; } Does this seems a better approach? Regards, Nuno On 07 Jan 2015, at 10:30, Nuno Santos <nunosan...@imaginando.pt> wrote: Hi Igor, Ops… You are right, it is not static. I have tried your suggestion but now it crashes everytime I close the app and I can’t even get a stack trace like before. If I run it on debug, it points me to assembler code. Not anything I can really point to. Regards, Nuno
On 07 Jan 2015, at 10:19, Igor Mironchik <igor.mironc...@gmail.com> wrote: On Wed, 07 Jan 2015 13:01:32 +0300, Nuno Santos < <mailto:nunosan...@imaginando.pt> nunosan...@imaginando.pt> wrote: Yes, int main(int argc, char **argv) { QGuiApplication app(argc, argv); ... return app.exec(); } No. Here QGuiApplication is not static. Then in your app the situation is the next: QGuiApplication destroyes before your Manager. But any QObject-derived class must be created after QApplication and destroyed before QApplication. May be this is the reason of your crash. Make QGuiApplication static. For example: static QSharedPointer< QApplication > application( int argc = 0, char ** argv = 0 ) { static QSharedPointer< QApplication > app( new QApplication( argc, argv ) ); return app; } and in main() QSharedPointer< QApplication > app = application( argc, argv ); before any QObject... On 07 Jan 2015, at 09:54, Igor Mironchik <igor.mironc...@gmail.com> wrote: Hi, I have one question: is QApplication static too? On Wed, 07 Jan 2015 12:32:21 +0300, Nuno Santos <nunosan...@imaginando.pt> wrote: Hi, I’m having a problem with a random crash that not always happens. I would like to have your advice on how to find the origin of it. This crash always happens on program exit and the stack trace is the following: Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 org.qt-project.QtCore 0x0000000109a03549 QMutexPrivate::allocate() + 105 1 org.qt-project.QtCore 0x0000000109a02d1c QBasicMutex::lockInternal(int) + 92 2 org.qt-project.QtCore 0x0000000109a02c64 QMutex::lock() + 52 3 org.qt-project.QtCore 0x0000000109a0b6fd QWaitCondition::wait(QMutex*, unsigned long) + 173 4 org.qt-project.QtCore 0x0000000109a0aeae QThread::wait(unsigned long) + 110 5 org.qt-project.QtNetwork 0x000000010a4870da QNetworkAccessManagerPrivate::~QNetworkAccessManagerPrivate() + 58 6 org.qt-project.QtNetwork 0x000000010a48722e QNetworkAccessManagerPrivate::~QNetworkAccessManagerPrivate() + 14 7 org.qt-project.QtCore 0x0000000109c3e7c7 QObject::~QObject() + 1879 8 org.qt-project.QtNetwork 0x000000010a483c16 QNetworkAccessManager::~QNetworkAccessManager() + 262 The only particularity of this QNetworkAccessManager is the fact that it is instantiated on a class that is a singleton: class Manager : public QObject { public: static Manager* sharedManager(); ... QNetworkAccessManager* networkAccessManager(); ... protected: Manager(); ~Manager(); ... QNetworkAccessManager _networkAccessManager; }; Manager* Manager::sharedManager() { QMutexLocker lock(&managerMutex); static Manager manager; return &manager; } Manager::Manager() : _networkAccessManager() { ... } Manager::~Manager() { } Is there any obvious reason for this crash to happen randomly at program termination? Thanks, Regards, Nuno Santos _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest -- Best Regards, Igor Mironchik. _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest -- Best Regards, Igor Mironchik. _______________________________________________ Interest mailing list <mailto:Interest@qt-project.org> Interest@qt-project.org <http://lists.qt-project.org/mailman/listinfo/interest> http://lists.qt-project.org/mailman/listinfo/interest
_______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
