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
>> <mailto:igor.mironc...@gmail.com>> wrote:
>>
>> On Wed, 07 Jan 2015 13:01:32 +0300, Nuno Santos <nunosan...@imaginando.pt
>> <mailto: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
>>>> <mailto: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
>>>> <mailto: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 <mailto:Interest@qt-project.org>
>>>>> http://lists.qt-project.org/mailman/listinfo/interest
>>>>
>>>>
>>>> --
>>>> Best Regards,
>>>> Igor Mironchik.
>>>> _______________________________________________
>>>> Interest mailing list
>>>> Interest@qt-project.org <mailto:Interest@qt-project.org>
>>>> http://lists.qt-project.org/mailman/listinfo/interest
>>>
>>
>>
>> --
>> Best Regards,
>> Igor Mironchik.
>
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