Thiago Macieira wrote:
> You can call multiple times and you'll always get the same connection.
OK, thanks.
Here's another observation (& backtrace) potentially to be taken into account
for your fix: when I don't get a crash-on-exit I often get a deadlock like so:
* frame #0: 0x00007fff85129716 libsystem_kernel.dylib`__psynch_cvwait + 10
frame #1: 0x00007fff8af34c3b libsystem_pthread.dylib`_pthread_cond_wait +
727
frame #2: 0x0000000112abc77b
QtCore`QWaitConditionPrivate::wait(this=0x00007fda59e5a300, time=<unavailable>)
+ 75 at qwaitcondition_unix.cpp:136
frame #3: 0x0000000112abc62b
QtCore`QWaitCondition::wait(this=0x00007fda59e517d8, mutex=0x00007fda59e517d0,
time=18446744073709551615) + 155 at qwaitcondition_unix.cpp:208
frame #4: 0x0000000112ab683f
QtCore`QSemaphore::acquire(this=0x00007fff50614d38, n=1) + 79 at
qsemaphore.cpp:137
frame #5: 0x0000000112cadc13
QtCore`QMetaObject::activate(sender=0x00007fda59c56500,
signalOffset=<unavailable>, local_signal_index=<unavailable>,
argv=<unavailable>) + 2499 at qobject.cpp:3698
frame #6: 0x000000011134f280
QtDBus`QDBusConnectionPrivate::signalNeedsDisconnecting(this=<unavailable>,
_t1=<unavailable>, _t2=<unavailable>) + 64 at moc_qdbusconnection_p.cpp:345
frame #7: 0x00000001113135ff
QtDBus`QDBusConnectionPrivate::disconnectSignal(this=0x00007fda59c56500,
service=<unavailable>, path=<unavailable>, interface=<unavailable>,
name=<unavailable>, argumentMatch=<unavailable>, signature=<unavailable>,
receiver=<unavailable>, slot=<unavailable>) + 287 at qdbusintegrator.cpp:2188
frame #8: 0x00000001113008fb QtDBus`QDBusConnection::disconnect(QString
const&, QString const&, QString const&, QString const&, QObject*, char const*)
[inlined] QStringList::QStringList(this=0x0000000112eed470,
this=0x0000000112eed470, this=0x0000000112eecc30, this=0x0000000112eecc30,
argumentMatch=0x0000000112eed470, signature=0x0000000112eecc30,
receiver=<unavailable>) + 158 at qdbusconnection.cpp:864
frame #9: 0x000000011130085d
QtDBus`QDBusConnection::disconnect(this=0x00007fda5c51b9e0,
service=0x00007fff50614ff8, path=0x00007fff50614ff0,
interface=0x00007fff50614fe8, name=0x00007fff50614fe0,
receiver=0x00007fda5a191000, slot=0x000000011f0532d8) + 29 at
qdbusconnection.cpp:822
frame #10: 0x000000011eff0e88
qtcurve.so`QtCurve::Style::disconnectDBus(this=0x00007fda5a191000) + 168 at
qtcurve.cpp:712
frame #11: 0x000000011f029e96
qtcurve.so`QtCurve::StylePlugin::~StylePlugin() [inlined]
QtCurve::runAllCleanups() + 13 at qtcurve_plugin.cpp:86
frame #12: 0x000000011f029e89
qtcurve.so`QtCurve::StylePlugin::~StylePlugin() [inlined]
QtCurve::StylePlugin::~StylePlugin(this=<unavailable>) + 16 at
qtcurve_plugin.cpp:167
frame #13: 0x000000011f029e79
qtcurve.so`QtCurve::StylePlugin::~StylePlugin() [inlined]
QtCurve::StylePlugin::~StylePlugin(this=<unavailable>) at qtcurve_plugin.cpp:166
frame #14: 0x000000011f029e79
qtcurve.so`QtCurve::StylePlugin::~StylePlugin(this=<unavailable>) + 9 at
qtcurve_plugin.cpp:166
frame #15: 0x0000000112c6e24d
QtCore`QLibraryPrivate::unload(this=0x00007fda59e51230, flag=NoUnloadSys) + 93
at qlibrary.cpp:551
frame #16: 0x0000000112c66d48
QtCore`QFactoryLoaderPrivate::~QFactoryLoaderPrivate(this=0x00007fda59e50ca0) +
88 at qfactoryloader.cpp:88
frame #17: 0x0000000112c6714e
QtCore`QFactoryLoaderPrivate::~QFactoryLoaderPrivate() [inlined]
QFactoryLoaderPrivate::~QFactoryLoaderPrivate(this=0x00007fda59e50ca0) + 14 at
qfactoryloader.cpp:85
frame #18: 0x0000000112c67149
QtCore`QFactoryLoaderPrivate::~QFactoryLoaderPrivate(this=0x00007fda59e50ca0) +
9 at qfactoryloader.cpp:85
frame #19: 0x0000000112ca5801 QtCore`QObject::~QObject() [inlined]
QScopedPointerDeleter<QObjectData>::cleanup(pointer=<unavailable>) + 2033 at
qscopedpointer.h:54
frame #20: 0x0000000112ca57f6 QtCore`QObject::~QObject() [inlined]
QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData>
>::~QScopedPointer() + 4 at qscopedpointer.h:101
frame #21: 0x0000000112ca57f2 QtCore`QObject::~QObject() [inlined]
QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData>
>::~QScopedPointer() at qscopedpointer.h:99
frame #22: 0x0000000112ca57f2 QtCore`QObject::~QObject(this=<unavailable>)
+
2018 at qobject.cpp:1042
frame #23: 0x0000000112c6928e QtCore`QFactoryLoader::~QFactoryLoader()
[inlined] QFactoryLoader::~QFactoryLoader(this=0x00007fda59e2a3a0) + 14 at
qfactoryloader.cpp:227
frame #24: 0x0000000112c69289
QtCore`QFactoryLoader::~QFactoryLoader(this=0x00007fda59e2a3a0) + 9 at
qfactoryloader.cpp:227
frame #25: 0x0000000111b93616 QtWidgets`(anonymous
namespace)::Q_QGS_loader::innerFunction()::Cleanup::~Cleanup() [inlined]
(anonymous namespace)::Q_QGS_loader::innerFunction()::Cleanup::~Cleanup() + 18
at qstylefactory.cpp:70
frame #26: 0x0000000111b93604 QtWidgets`(anonymous
namespace)::Q_QGS_loader::innerFunction(this=<unavailable>)::Cleanup::~Cleanup()
+ 4 at qstylefactory.cpp:70
frame #27: 0x00007fff8342d7b5 libsystem_c.dylib`__cxa_finalize + 177
That one goes away when I simply don't disconnect (but that apparently
sometimes
led to segfaults on Linux when events came in after the receiver was deleted
(and the style plugin was already dlclose'd)).
R.
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