[Development] QNetwork problem in threaded application.
Shane Kearns
shane.kearns.qt at gmail.com
Mon Sep 9 19:58:08 CEST 2013
moveToThread on a socket should do the following:
1. cancel socket notifiers
2. change thread affinity
3. (in new thread) re-enable socket notifiers.
Could be that step 1 doesn't remove already pending notifications when
using the gnome event dispatcher.
For a safe multithreaded server, you should pass the socket descriptor from
QTcpServer::incomingConnection to the thread that will handle that
connection.
See the note in
http://qt-project.org/doc/qt-5.0/qtnetwork/qtcpserver.html#incomingConnection
On 9 September 2013 10:32, Benjamin Zeller <zeller.benjamin at web.de> wrote:
> Hello,
>
> i'm currently stress-testing a application at work and came across this
> problem.
> The application accepts connections and pushes the created sockets
> to a worker thread (moveToThread), the worker thread then handles the
> rest.
> But sometimes when the socket was already closed in the thread i
> get a SEGFAULT. It seems something in the mainthread tries to access
> the socket engine.
>
> After debugging it i saw that in the backtrace
> QCoreApplication::sendEvent is used, instead of postEvent.
>
>
>
>
> Backtrace Mainloop (stops in qabstractsocket.cpp line 741):
>
> if (readSocketNotifierStateSet && socketEngine &&
> >> readSocketNotifierState !=
> socketEngine->isReadNotificationEnabled()) {
> socketEngine->setReadNotificationEnabled(readSocketNotifierState);
> readSocketNotifierStateSet = false;
> }
> return true;
>
>
>
> In the Thread backtrace you can see the thread is closed
> ------------------------ Backtrace Thread ------------------------------
> Thread 17 (Thread 0x7f8fc0df3700 (LWP 5101)):
> #0 0x00007f8fe0d397fd in QLocalePrivate::plus (this=0x7f8f9c010260) at
> tools/qlocale_p.h:228
> No locals.
> #1 0x00007f8fe0d363a0 in QLocalePrivate::unsLongLongToString
> (this=0x7f8f9c010260, l=15, precision=-1, base=10, width=-1, flags=0) at
> tools/qlocale.cpp:3036
> No locals.
> #2 0x00007f8fe0ddc0af in QTextStreamPrivate::putNumber
> (this=0x7f8f9c0140e0, number=15, negative=false) at io/qtextstream.cpp:2220
> flags = 0
> dd = 0x7f8f9c010260
> result = {static null = {<No data fields>}, d = 0x7f8fe0f5bd60
> <QArrayData::shared_null>}
> numberFlags = {i = 0}
> base = 10
> #3 0x00007f8fe0ddc5f0 in QTextStream::operator<< (this=0x7f8f9c012420,
> i=15) at io/qtextstream.cpp:2296
> d = 0x7f8f9c0140e0
> __PRETTY_FUNCTION__ = "QTextStream& QTextStream::operator<<(int)"
> #4 0x00007f8fe17463e3 in QDebug::operator<< (this=0x7f8fc0df1cd0, t=15)
> at /opt/Qt/5.1.1/include/QtCore/qdebug.h:107
> No locals.
> #5 0x00007f8fe17564f3 in Tufao::tDebug () at
>
> /home/zbenjamin/workspace.work/tufao/src/threadedhttprequestdispatcher.cpp:284
> t = 0xae1440
> __PRETTY_FUNCTION__ = "QDebug Tufao::tDebug()"
> #6 0x00007f8fe175c819 in Tufao::WorkerThreadControl::onRequestClosed
> (this=0x7f8fc0df2d50) at
> /home/zbenjamin/workspace.work/tufao/src/priv/workerthreadcontrol.cpp:46
> No locals.
> #7 0x00007f8fe175c5bd in
> QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>,
> void, void (Tufao::WorkerThreadControl::*)()>::call(void
> (Tufao::WorkerThreadControl::*)(), Tufao::WorkerThreadControl*, void**)
> (f=(void (Tufao::WorkerThreadControl::*)(Tufao::WorkerThreadControl *
> const)) 0x7f8fe175c800 <Tufao::WorkerThreadControl::onRequestClosed()>,
> o=0x7f8fc0df2d50, arg=0x7f8fc0df1f30) at
> /opt/Qt/5.1.1/include/QtCore/qobjectdefs_impl.h:508
> No locals.
> #8 0x00007f8fe175c550 in QtPrivate::FunctionPointer<void
> (Tufao::WorkerThreadControl::*)()>::call<QtPrivate::List<>, void>(void
> (Tufao::WorkerThreadControl::*)(), Tufao::WorkerThreadControl*, void**)
> (f=(void (Tufao::WorkerThreadControl::*)(Tufao::WorkerThreadControl *
> const)) 0x7f8fe175c800 <Tufao::WorkerThreadControl::onRequestClosed()>,
> o=0x7f8fc0df2d50, arg=0x7f8fc0df1f30) at
> /opt/Qt/5.1.1/include/QtCore/qobjectdefs_impl.h:527
> No locals.
> #9 0x00007f8fe175c4bd in QtPrivate::QSlotObject<void
> (Tufao::WorkerThreadControl::*)(), QtPrivate::List<>, void>::impl(int,
> QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (which=1,
> this_=0x7f8f9c0132c0, r=0x7f8fc0df2d50, a=0x7f8fc0df1f30, ret=0x0) at
> /opt/Qt/5.1.1/include/QtCore/qobject_impl.h:147
> No locals.
> #10 0x00007f8fe0ecc69b in QtPrivate::QSlotObjectBase::call
> (this=0x7f8f9c0132c0, r=0x7f8fc0df2d50, a=0x7f8fc0df1f30) at
> ../../include/QtCore/../../src/corelib/kernel/qobject_impl.h:130
> No locals.
> #11 0x00007f8fe0ec9a02 in QMetaObject::activate (sender=0xc48dd0,
> signalOffset=3, local_signal_index=3, argv=0x0) at kernel/qobject.cpp:3471
> obj = {d = 0x7f8f9c0132c0}
> receiverInSameThread = true
> sw = {receiver = 0x7f8fc0df2d50, previousSender = 0x0,
> currentSender = {sender = 0xc48dd0, signal = 6, ref = 1}, switched = true}
> callFunction = 0x7f8f9c0132c0
> receiver = 0x7f8fc0df2d50
> method_relative = 0
> c = 0x7f8f9c011680
> last = 0x7f8f9c011680
> locker = {val = 140255935355400}
> connectionLists = {connectionLists = 0x1144920}
> list = 0xeeb188
> signal_index = 6
> empty_argv = {0x0}
> currentThreadId = 0x7f8fc0df3700
> __PRETTY_FUNCTION__ = "static void
> QMetaObject::activate(QObject*, int, int, void**)"
> #12 0x00007f8fe0ec934c in QMetaObject::activate (sender=0xc48dd0,
> m=0x7f8fe197e4a0 <Tufao::HttpServerRequest::staticMetaObject>,
> local_signal_index=3, argv=0x0) at kernel/qobject.cpp:3354
> No locals.
> #13 0x00007f8fe175d6c9 in Tufao::HttpServerRequest::close
> (this=0xc48dd0) at
>
> /home/zbenjamin/workspace.work/tufao-build/src/moc_httpserverrequest.cpp:193
> No locals.
> #14 0x00007f8fe175d39c in Tufao::HttpServerRequest::qt_static_metacall
> (_o=0xc48dd0, _c=QMetaObject::InvokeMetaMethod, _id=3,
> _a=0x7f8fc0df2120) at
> /home/zbenjamin/workspace.work/tufao-build/src/moc_httpserverrequest.cpp:93
> _t = 0xc48dd0
> #15 0x00007f8fe0ec9afb in QMetaObject::activate (sender=0x11010b0,
> signalOffset=7, local_signal_index=2, argv=0x0) at kernel/qobject.cpp:3479
> receiverInSameThread = true
> sw = {receiver = 0xc48dd0, previousSender = 0x0, currentSender
> = {sender = 0x11010b0, signal = 9, ref = 1}, switched = true}
> callFunction = 0x7f8fe175d310
> <Tufao::HttpServerRequest::qt_static_metacall(QObject*,
> QMetaObject::Call, int, void**)>
> receiver = 0xc48dd0
> method_relative = 3
> c = 0xdefea0
> last = 0xe338e0
> locker = {val = 140255935355448}
> connectionLists = {connectionLists = 0x113e4e0}
> list = 0xbf3858
> signal_index = 9
> empty_argv = {0x0}
> currentThreadId = 0x7f8fc0df3700
> __PRETTY_FUNCTION__ = "static void
> QMetaObject::activate(QObject*, int, int, void**)"
> #16 0x00007f8fe0ec934c in QMetaObject::activate (sender=0x11010b0,
> m=0x7f8fe16cd1e0 <QAbstractSocket::staticMetaObject>,
> local_signal_index=2, argv=0x0) at kernel/qobject.cpp:3354
> No locals.
> #17 0x00007f8fe142276d in QAbstractSocket::disconnected (this=0x11010b0)
> at .moc/debug-shared/moc_qabstractsocket.cpp:366
> No locals.
> #18 0x00007f8fe1421c42 in QAbstractSocket::disconnectFromHost
> (this=0x11010b0) at socket/qabstractsocket.cpp:2700
> d = 0xd30ab0
> previousState = QAbstractSocket::ClosingState
> #19 0x00007f8fe141cce7 in QAbstractSocketPrivate::canReadNotification
> (this=0xd30ab0) at socket/qabstractsocket.cpp:701
> q = 0x11010b0
> rsncrollback = {varRef = @0xd30b88, oldValue = true}
> newBytes = 0
> hasData = false
> #20 0x00007f8fe1420b8a in QAbstractSocket::waitForBytesWritten
> (this=0x11010b0, msecs=30000) at socket/qabstractsocket.cpp:2181
> readyToRead = true
> readyToWrite = true
> d = 0xd30ab0
> __PRETTY_FUNCTION__ = "virtual bool
> QAbstractSocket::waitForBytesWritten(int)"
> stopWatch = {t1 = 10161, t2 = 636117446}
> #21 0x00007f8fe173b359 in Tufao::HttpFileServer::serveFile
> (fileName=..., request=..., response=...) at
> /home/zbenjamin/workspace.work/tufao/src/httpfileserver.cpp:243
> fileInfo = {d_ptr = {d = 0x7f8f9c012920}}
> file = {<QFileDevice> = {<QIODevice> = {<QObject> =
> {_vptr.QObject = 0x7f8fe133fc50 <vtable for QFile+16>, static
> staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f8fe1001520
> <qt_meta_stringdata_QObject>, data = 0x7f8fe1001640
> <qt_meta_data_QObject>, static_metacall = 0x7f8fe0ecbff4
> <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>,
> relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d =
> 0x7f8f9c010cb0}, static staticQtMetaObject = {d = {superdata = 0x0,
> stringdata = 0x7f8fe104e220 <qt_meta_stringdata_Qt>, data =
> 0x7f8fe1057c00 <qt_meta_data_Qt>, static_metacall = 0x0,
> relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject =
> {d = {superdata = 0x7f8fe133df20 <QObject::staticMetaObject>, stringdata
> = 0x7f8fe1061e40 <qt_meta_stringdata_QIODevice>, data = 0x7f8fe1061f40
> <qt_meta_data_QIODevice>, static_metacall = 0x7f8fe0f4f7a0
> <QIODevice::qt_static_metacall(QObject*, QMetaObject::Call, int,
> void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}, static
> staticMetaObject = {d = {superdata = 0x7f8fe133ff00
> <QIODevice::staticMetaObject>, stringdata = 0x7f8fe1061d40
> <qt_meta_stringdata_QFileDevice>, data = 0x7f8fe1061d80
> <qt_meta_data_QFileDevice>, static_metacall = 0x7f8fe0f4f6b4
> <QFileDevice::qt_static_metacall(QObject*, QMetaObject::Call, int,
> void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}, static
> staticMetaObject = {d = {superdata = 0x7f8fe133fd80
> <QFileDevice::staticMetaObject>, stringdata = 0x7f8fe1061c60
> <qt_meta_stringdata_QFile>, data = 0x7f8fe1061c80 <qt_meta_data_QFile>,
> static_metacall = 0x7f8fe0f4f5c8 <QFile::qt_static_metacall(QObject*,
> QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata =
> 0x0}}}
> ranges = {{p = {static shared_null = {ref = {atomic = {_q_value
> = -1}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d =
> 0x7f8fe0f5e950 <QListData::shared_null>}, d = 0x7f8fe0f5e950
> <QListData::shared_null>}}
> __PRETTY_FUNCTION__ = "static void
> Tufao::HttpFileServer::serveFile(const QString&,
> Tufao::HttpServerRequest&, Tufao::HttpServerResponse&)"
> #22 0x00007f8fe173d445 in Tufao::HttpFileServer::handleRequest
> (request=..., response=..., rootDir=...) at
> /home/zbenjamin/workspace.work/tufao/src/httpfileserver.cpp:373
> fileName = {static null = {<No data fields>}, d = 0x7f8f9c00fbf0}
> #23 0x00007f8fe173c7b3 in Tufao::HttpFileServer::__lambda1::operator()
> (__closure=0x7f8f9c003530, request=..., response=...) at
> /home/zbenjamin/workspace.work/tufao/src/httpfileserver.cpp:347
> dir = {static null = {<No data fields>}, d = 0xae18a0}
> #24 0x00007f8fe173ca0d in
> std::_Function_handler<bool(Tufao::HttpServerRequest&,
> Tufao::HttpServerResponse&), Tufao::HttpFileServer::handler(const
> QString&)::__lambda1>::_M_invoke(const std::_Any_data &,
> Tufao::HttpServerRequest &, Tufao::HttpServerResponse &) (__functor=...,
> __args#0=..., __args#1=...) at /usr/include/c++/4.8.1/functional:2057
> No locals.
> #25 0x00007f8fe173f64f in std::function<bool (Tufao::HttpServerRequest&,
> Tufao::HttpServerResponse&)>::operator()(Tufao::HttpServerRequest&,
> Tufao::HttpServerResponse&) const (this=0x7f8f9c0034a8, __args#0=...,
> __args#1=...) at /usr/include/c++/4.8.1/functional:2468
> No locals.
> #26 0x00007f8fe173e6e4 in Tufao::HttpServerRequestRouter::handleRequest
> (this=0x7f8f9c0013b0, request=..., response=...) at
> /home/zbenjamin/workspace.work/tufao/src/httpserverrequestrouter.cpp:96
> args = {<QList<QString>> = {{p = {static shared_null = {ref =
> {atomic = {_q_value = -1}}, alloc = 0, begin = 0, end = 0, array =
> {0x0}}, d = 0x7f8fe0f5e950 <QListData::shared_null>}, d = 0x7f8fe0f5e950
> <QListData::shared_null>}}, <No data fields>}
> backup = {d = {data = {c = 0 '\000', uc = 0 '\000', s = 0, sc =
> 0 '\000', us = 0, i = 0, u = 0, l = 0, ul = 0, b = false, d = 0, f = 0,
> real = 0, ll = 0, ull = 0, o = 0x0, ptr = 0x0, shared = 0x0}, type = 0,
> is_shared = 0, is_null = 1}}
> match = {d = {d = 0x7f8f9c015860}}
> mapping = @0x7f8f9c003498: {path = {d = {d = 0x7f8f9c003240}},
> method = {d = 0x7f8fe0f5bd60 <QArrayData::shared_null>}, handler =
> {<std::_Maybe_unary_or_binary_function<bool, Tufao::HttpServerRequest&,
> Tufao::HttpServerResponse&>> =
> {<std::binary_function<Tufao::HttpServerRequest&,
> Tufao::HttpServerResponse&, bool>> = {<No data fields>}, <No data
> fields>}, <std::_Function_base> = {static _M_max_size = 16, static
> _M_max_align = 8, _M_functor = {_M_unused = {_M_object = 0x7f8f9c003530,
> _M_const_object = 0x7f8f9c003530, _M_function_pointer = 0x7f8f9c003530,
> _M_member_pointer = (void
> (std::_Undefined_class::*)(std::_Undefined_class * const))
> 0x7f8f9c003530}, _M_pod_data =
> "05\000\234\217\177\000\000\000\000\000\000\000\000\000"}, _M_manager =
> 0x7f8fe173ca16
> <std::_Function_base::_Base_manager<Tufao::HttpFileServer::handler(const
> QString&)::__lambda1>::_M_manager(std::_Any_data &, const std::_Any_data
> &, std::_Manager_operation)>}, _M_invoker = 0x7f8fe173c9be
> <std::_Function_handler<bool(Tufao::HttpServerRequest&,
> Tufao::HttpServerResponse&), Tufao::HttpFileServer::handler(const
> QString&)::__lambda1>::_M_invoke(const std::_Any_data &,
> Tufao::HttpServerRequest &, Tufao::HttpServerResponse &)>}}
> __for_range = @0x7f8f9c0013e0: {d = 0x7f8f9c003450}
> __for_begin = 0x7f8f9c003498
> __for_end = 0x7f8f9c0034f8
> path = {static null = {<No data fields>}, d = 0xde41c0}
> #27 0x00007f8fe175bb87 in Tufao::WorkerThread::run (this=0xae1440) at
> /home/zbenjamin/workspace.work/tufao/src/priv/workerthread.cpp:117
> request = {wp = {d = 0x1151eb0, value = 0xc48dd0}}
> response = {wp = {d = 0x1064240, value = 0xe9e8a0}}
> handled = true
> customData = 0x7f8f9c0029a0
> handler = 0x7f8f9c0013c0
> controller = {<QObject> = {_vptr.QObject = 0x7f8fe197ec90
> <vtable for Tufao::WorkerThreadControl+16>, static staticMetaObject = {d
> = {superdata = 0x0, stringdata = 0x7f8fe1001520
> <qt_meta_stringdata_QObject>, data = 0x7f8fe1001640
> <qt_meta_data_QObject>, static_metacall = 0x7f8fe0ecbff4
> <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>,
> relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d =
> 0x7f8f9c0033d0}, static staticQtMetaObject = {d = {superdata = 0x0,
> stringdata = 0x7f8fe104e220 <qt_meta_stringdata_Qt>, data =
> 0x7f8fe1057c00 <qt_meta_data_Qt>, static_metacall = 0x0,
> relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject =
> {d = {superdata = 0x7f8fe133df20 <QObject::staticMetaObject>, stringdata
> = 0x7f8fe1765be0 <qt_meta_stringdata_Tufao__WorkerThreadControl>, data =
> 0x7f8fe1765cc0 <qt_meta_data_Tufao__WorkerThreadControl>,
> static_metacall = 0x7f8fe175e550
> <Tufao::WorkerThreadControl::qt_static_metacall(QObject*,
> QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata =
> 0x0}}}
> __PRETTY_FUNCTION__ = "virtual void Tufao::WorkerThread::run()"
> #28 0x00007f8fe0c99cec in QThreadPrivate::start (arg=0xae1440) at
> thread/qthread_unix.cpp:345
> __clframe = {__cancel_routine = 0x7f8fe0c99d80
> <QThreadPrivate::finish(void*)>, __cancel_arg = 0xae1440, __do_it = 1,
> __cancel_type = 0}
> thr = 0xae1440
> data = 0xae1600
> objectName = {static null = {<No data fields>}, d =
> 0x7f8fe0f5bd60 <QArrayData::shared_null>}
> #29 0x00007f8fe09e20a2 in start_thread () from /usr/lib/libpthread.so.0
> No symbol table info available.
> #30 0x00007f8fdfef7a2d in clone () from /usr/lib/libc.so.6
> No symbol table info available.
>
>
>
> In the main backtrace the receiver is accessed, but it belongs to
> another thread:
>
> ------------------------------------ Backtrace MAIN -------------------
>
> Thread 1 (Thread 0x7f8fe1b5c740 (LWP 5077)):
> #0 0x00007f8fe1002050 in typeinfo name for QObjectPrivate () from
> /opt/Qt/5.1.1/lib/libQt5Core.so.5
> No symbol table info available.
> #1 0x00007f8fe141cf33 in QAbstractSocketPrivate::canReadNotification
> (this=0xd30ab0) at socket/qabstractsocket.cpp:741
> q = 0x11010b0
> rsncrollback = {varRef = @0xd30b88, oldValue = false}
> newBytes = 76
> hasData = true
> #2 0x00007f8fe1422e66 in QAbstractSocketPrivate::readNotification
> (this=0xd30ab0) at socket/qabstractsocket_p.h:77
> No locals.
> #3 0x00007f8fe140ece5 in QAbstractSocketEngine::readNotification
> (this=0x15a25d0) at socket/qabstractsocketengine.cpp:156
> receiver = 0xd30b80
> #4 0x00007f8fe142b294 in QReadNotifier::event (this=0x15a25f0,
> e=0x7fff2d1ecce0) at socket/qnativesocketengine.cpp:1147
> No locals.
> #5 0x00007f8fe0e8a18c in QCoreApplicationPrivate::notify_helper
> (this=0xad7ae0, receiver=0x15a25f0, event=0x7fff2d1ecce0) at
> kernel/qcoreapplication.cpp:984
> No locals.
> #6 0x00007f8fe0e89e4e in QCoreApplication::notify (this=0x7fff2d1ed070,
> receiver=0x15a25f0, event=0x7fff2d1ecce0) at
> kernel/qcoreapplication.cpp:929
> d = 0xad7ae0
> __PRETTY_FUNCTION__ = "virtual bool
> QCoreApplication::notify(QObject*, QEvent*)"
> #7 0x00007f8fe0e89d56 in QCoreApplication::notifyInternal
> (this=0x7fff2d1ed070, receiver=0x15a25f0, event=0x7fff2d1ecce0) at
> kernel/qcoreapplication.cpp:867
> threadData = 0xad7ba0
> loopLevelCounter = {threadData = 0xad7ba0}
> result = false
> cbdata = {0x15a25f0, 0x7fff2d1ecce0, 0x7fff2d1ecc6f}
> d = 0xf67e80
> #8 0x00007f8fe0e8d8bb in QCoreApplication::sendEvent
> (receiver=0x15a25f0, event=0x7fff2d1ecce0) at
> ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:232
> No locals.
> #9 0x00007f8fe0ef94b0 in socketNotifierSourceDispatch (source=0xada340)
> at kernel/qeventdispatcher_glib.cpp:109
> p = 0x15a24e0
> i = 54
> event = {_vptr.QEvent = 0x7f8fe133ddf0 <vtable for QEvent+16>,
> static staticMetaObject = {d = {superdata = 0x0, stringdata =
> 0x7f8fe10649a0 <qt_meta_stringdata_QEvent>, data = 0x7f8fe1066320
> <qt_meta_data_QEvent>, static_metacall = 0x0, relatedMetaObjects = 0x0,
> extradata = 0x0}}, d = 0x0, t = 50, posted = 0, spont = 0, m_accept = 1,
> reserved = 33}
> src = 0xada340
> #10 0x00007f8fdeb6cd96 in g_main_context_dispatch () from
> /usr/lib/libglib-2.0.so.0
> No symbol table info available.
> #11 0x00007f8fdeb6d0e8 in ?? () from /usr/lib/libglib-2.0.so.0
> No symbol table info available.
> #12 0x00007f8fdeb6d18c in g_main_context_iteration () from
> /usr/lib/libglib-2.0.so.0
> No symbol table info available.
> #13 0x00007f8fe0efa163 in QEventDispatcherGlib::processEvents
> (this=0xad8df0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
> d = 0xad8e10
> canWait = true
> savedFlags = {i = 0}
> result = false
> #14 0x00007f8fe0e86ab6 in QEventLoop::processEvents
> (this=0x7fff2d1ecf80, flags=...) at kernel/qeventloop.cpp:136
> d = 0xb081b0
> #15 0x00007f8fe0e86d99 in QEventLoop::exec (this=0x7fff2d1ecf80,
> flags=...) at kernel/qeventloop.cpp:212
> locker = {val = 11369632}
> __PRETTY_FUNCTION__ = "int
> QEventLoop::exec(QEventLoop::ProcessEventsFlags)"
> ref = {d = 0xb081b0, locker = @0x7fff2d1ecf00, exceptionCaught
> = true}
> app = 0x7fff2d1ed070
> d = 0xb081b0
> #16 0x00007f8fe0e8a432 in QCoreApplication::exec () at
> kernel/qcoreapplication.cpp:1120
> threadData = 0xad7ba0
> __PRETTY_FUNCTION__ = "static int QCoreApplication::exec()"
> eventLoop = {<QObject> = {_vptr.QObject = 0x7f8fe1341670
> <vtable for QEventLoop+16>, static staticMetaObject = {d = {superdata =
> 0x0, stringdata = 0x7f8fe1001520 <qt_meta_stringdata_QObject>, data =
> 0x7f8fe1001640 <qt_meta_data_QObject>, static_metacall = 0x7f8fe0ecbff4
> <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>,
> relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0xb081b0},
> static staticQtMetaObject = {d = {superdata = 0x0, stringdata =
> 0x7f8fe104e220 <qt_meta_stringdata_Qt>, data = 0x7f8fe1057c00
> <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0,
> extradata = 0x0}}}, static staticMetaObject = {d = {superdata =
> 0x7f8fe133df20 <QObject::staticMetaObject>, stringdata = 0x7f8fe10644a0
> <qt_meta_stringdata_QEventLoop>, data = 0x7f8fe1064500
> <qt_meta_data_QEventLoop>, static_metacall = 0x7f8fe0f52aa0
> <QEventLoop::qt_static_metacall(QObject*, QMetaObject::Call, int,
> void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
> returnCode = 32655
> #17 0x00000000004036a4 in main (argc=1, argv=0x7fff2d1ed1e8) at
> ../../../src/server/main.cpp:85
> a = {<QObject> = {_vptr.QObject = 0x7f8fe1341750 <vtable for
> QCoreApplication+16>, static staticMetaObject = {d = {superdata = 0x0,
> stringdata = 0x7f8fe1001520 <qt_meta_stringdata_QObject>, data =
> 0x7f8fe1001640 <qt_meta_data_QObject>, static_metacall = 0x7f8fe0ecbff4
> <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>,
> relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0xad7ae0},
> static staticQtMetaObject = {d = {superdata = 0x0, stringdata =
> 0x7f8fe104e220 <qt_meta_stringdata_Qt>, data = 0x7f8fe1057c00
> <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0,
> extradata = 0x0}}}, static staticMetaObject = {d = {superdata =
> 0x7f8fe133df20 <QObject::staticMetaObject>, stringdata = 0x7f8fe1064620
> <qt_meta_stringdata_QCoreApplication>, data = 0x7f8fe1064840
> <qt_meta_data_QCoreApplication>, static_metacall = 0x7f8fe0f52bf8
> <QCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int,
> void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, static self =
> 0x7fff2d1ed070}
> server = {<QObject> = {_vptr.QObject = 0x7f8fe197f190 <vtable
> for Tufao::HttpServer+16>, static staticMetaObject = {d = {superdata =
> 0x0, stringdata = 0x7f8fe1001520 <qt_meta_stringdata_QObject>, data =
> 0x7f8fe1001640 <qt_meta_data_QObject>, static_metacall = 0x7f8fe0ecbff4
> <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>,
> relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0xadb6e0},
> static staticQtMetaObject = {d = {superdata = 0x0, stringdata =
> 0x7f8fe104e220 <qt_meta_stringdata_Qt>, data = 0x7f8fe1057c00
> <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0,
> extradata = 0x0}}}, static staticMetaObject = {d = {superdata =
> 0x7f8fe133df20 <QObject::staticMetaObject>, stringdata = 0x7f8fe1764b80
> <qt_meta_stringdata_Tufao__HttpServer>, data = 0x7f8fe1764d80
> <qt_meta_data_Tufao__HttpServer>, static_metacall = 0x7f8fe175d06e
> <Tufao::HttpServer::qt_static_metacall(QObject*, QMetaObject::Call, int,
> void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, priv = 0xadb760}
> pServer = {<Tufao::ThreadedHttpRequestDispatcher> = {<QObject>
> = {_vptr.QObject = 0x7f8fe197ea50 <vtable for
> Tufao::ThreadedHttpPluginServer+16>, static staticMetaObject = {d =
> {superdata = 0x0, stringdata = 0x7f8fe1001520
> <qt_meta_stringdata_QObject>, data = 0x7f8fe1001640
> <qt_meta_data_QObject>, static_metacall = 0x7f8fe0ecbff4
> <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>,
> relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0xadc1f0},
> static staticQtMetaObject = {d = {superdata = 0x0, stringdata =
> 0x7f8fe104e220 <qt_meta_stringdata_Qt>, data = 0x7f8fe1057c00
> <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0,
> extradata = 0x0}}}, <Tufao::AbstractHttpServerRequestHandler> =
> {_vptr.AbstractHttpServerRequestHandler = 0x7f8fe197ead0 <vtable for
> Tufao::ThreadedHttpPluginServer+144>}, static staticMetaObject = {d =
> {superdata = 0x7f8fe133df20 <QObject::staticMetaObject>, stringdata =
> 0x7f8fe1765fa0
> <qt_meta_stringdata_Tufao__ThreadedHttpRequestDispatcher>, data =
> 0x7f8fe1766100 <qt_meta_data_Tufao__ThreadedHttpRequestDispatcher>,
> static_metacall = 0x7f8fe175ea76
> <Tufao::ThreadedHttpRequestDispatcher::qt_static_metacall(QObject*,
> QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata =
> 0x0}}, priv = 0xadbaa0}, static staticMetaObject = {d = {superdata =
> 0x7f8fe197e7a0 <Tufao::ThreadedHttpRequestDispatcher::staticMetaObject>,
> stringdata = 0x7f8fe1765ec0
> <qt_meta_stringdata_Tufao__ThreadedHttpPluginServer>, data =
> 0x7f8fe1765f40 <qt_meta_data_Tufao__ThreadedHttpPluginServer>,
> static_metacall = 0x7f8fe175e912
> <Tufao::ThreadedHttpPluginServer::qt_static_metacall(QObject*,
> QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata =
> 0x0}}}
>
>
>
> ------------------------------------------------------------------------------
>
> Thats where the problem might be:
>
>
> static gboolean socketNotifierSourceDispatch(GSource *source,
> GSourceFunc, gpointer)
> {
> QEvent event(QEvent::SockAct);
>
> GSocketNotifierSource *src = reinterpret_cast<GSocketNotifierSource
> *>(source);
> for (int i = 0; i < src->pollfds.count(); ++i) {
> GPollFDWithQSocketNotifier *p = src->pollfds.at(i);
>
> if ((p->pollfd.revents & p->pollfd.events) != 0)
> QCoreApplication::sendEvent(p->socketNotifier, &event);
> }
>
> return true; // ??? don't remove, right?
> }
>
> sendEvent is used, but the receiver is in another thread, shouldn't it
> use postEvent?
>
> I'm on Linux, Qt 5.1.1 gcc
>
> _______________________________________________
> Development mailing list
> Development at qt-project.org
> http://lists.qt-project.org/mailman/listinfo/development
>
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