Version numbers? If you are not already doing so I'd suggest using the latest SIP v4 and PyQt snapshots.
Phil On Monday 29 December 2003 7:47 am, Patrick Stinson wrote: > I'm using alsa's rawmidi interface to read midi messages from hardware, > then pumping them to my qt application code. The problem thus far has been > dealing with the higher (~50-100/sec) volumes of messages received in a > dedicated thread, and integrating them safely into the main qt event > thread. > > My midi class has a blocking read method that produces messages. a python > thread is created to call it, and messages are put into a Queue.Queue > object. Another python thread reads from the queue and uses > QApplication.postEvent to get the message into the qt thread. All is fine > until I call a method like 'QSlider.setValue' that changes the way a widget > looks from my overridden QWidget.event() method. I've tried setting a > single-millisecond timer to generate events in place of the midi object, > and of course, everything works fine. Why is it that the slider dies when > the 'events', however proxied, originate in the midi thread? > > Sometimes I'm getting negative ref counts; what could be left over or > deleted so fast that python/qt couldn't keep up? > > > here is the simple result from an attempt at a > [midi thread: Queue.put()] -> > [dispatch thread: Queue.get(), QApplication.postEvent()] -> > [qt thread: event(),QEvent.data()] > > > bash-2.05b$ pksampler > WAD Enabled > pkaudio: found 4 devices, but only using 1. > pkaudio: ->> Found device: hw:PCI,0 > pkaudio: outputs: 2 > pkaudio: inputs: 2 > pkaudio: [[loaded device 1]] > pkaudio: ->> Found device: hw:Extigy,0 > pkaudio: outputs: 6 > pkaudio: inputs: 2 > pkaudio: sample rates: 48000 > pkaudio: ->> Found device: hw:Extigy,2 > pkaudio: outputs: 2 > pkaudio: inputs: 0 > pkaudio: sample rates: 48000 > PKSampler: driver buffer size: 2048 > PKSampler: driver sample rate: 44100 > PKSampler: All daemons up and running > WAD: Collecting debugging information... > WAD: Segmentation fault. > #12 0x40238247 in __clone() > #11 0x40030d40 in pthread_start_thread() > #10 0x080ee9bd in t_bootstrap() > #9 0x080c2da9 in PyEval_CallObjectWithKeywords() > #8 0x0805c3fe in PyObject_Call() > #7 0x080642d3 in instancemethod_call() > #6 0x0805c3fe in PyObject_Call() > #5 0x0810d125 in function_call() > #4 0x080c162f in PyEval_EvalCodeEx() > #3 0x080bf82f in eval_frame() > #2 0x080c3119 in call_function() > #1 0x0810d8d6 in PyCFunction_Call() > #0 0x417f58b1 in _Z26sipDo_QCustomEvent_setDataP7_objectS0_() > > > -------------------------------------- > > > I've had several horrendous stack traces, but I think the following one > best suits the extent of my problem... > > PKSampler: All daemons up and running > WAD: Collecting debugging information... > SegFault: [ C stack trace ] > > #50 0x080b9ef4 in PyEval_EvalCode() > #49 0x080c162f in PyEval_EvalCodeEx() > #48 0x080bf82f in eval_frame() > #47 0x080c3119 in call_function() > #46 0x0810d8d6 in PyCFunction_Call() > #45 0x418de03b in _Z28sipDo_QApplication_exec_loopP7_objectS0_() > #44 0x40563b11 in _ZN12QApplication4execEv() > #43 0x40576928 in _ZN10QEventLoop4execEv() > #42 0x40576a86 in _ZN10QEventLoop9enterLoopEv() > #41 0x4050fea4 in _ZN10QEventLoop13processEventsEj() > #40 0x4055301d in _ZN10QEventLoop14activateTimersEv() > #39 0x418db9fb in _ZN15sipQApplication6notifyEP7QObjectP6QEvent() > #38 0x40562cb5 in _ZN12QApplication6notifyEP7QObjectP6QEvent() > #37 0x405638c5 in _ZN12QApplication14internalNotifyEP7QObjectP6QEvent() > #36 0x41598b6f in _ZN9sipQTimer5eventEP6QEvent() > #35 0x405df932 in _ZN6QTimer5eventEP6QEvent() > #34 0x408da8eb in _ZN6QTimer7timeoutEv() > #33 0x405be454 in _ZN7QObject15activate_signalEi() > #32 0x405be620 in > _ZN7QObject15activate_signalEP15QConnectionListP8QUObject() #31 0x41907334 > in _ZN10sipProxyqt9qt_invokeEiP8QUObject() > #30 0x41523175 in _ZN10sipProxyqt9proxySlotEv() > #29 0x40019fdf in _Z13sipEmitToSlotP7sipSlotP7_object() > #28 0x080c2da9 in PyEval_CallObjectWithKeywords() > #27 0x0805c3fe in PyObject_Call() > #26 0x080642d3 in instancemethod_call() > #25 0x0805c3fe in PyObject_Call() > #24 0x0810d125 in function_call() > #23 0x080c162f in PyEval_EvalCodeEx() > #22 0x080bf82f in eval_frame() > #21 0x080c325b in call_function() > #20 0x080c3463 in fast_function() > #19 0x080bf82f in eval_frame() > #18 0x080c325b in call_function() > #17 0x080c3463 in fast_function() > #16 0x080bf82f in eval_frame() > #15 0x080c3119 in call_function() > #14 0x0810d8d6 in PyCFunction_Call() > #13 0x41b4223d in _Z23sipDo_PK_Effect_ControlP7_objectS0_() > #12 0x40020157 in sipMapCppToSelf() > #11 0x4001b713 in sipNewCppToSelf() > #10 0x0805ea92 in PyInstance_New() > #9 0x080c2da9 in PyEval_CallObjectWithKeywords() > #8 0x0805c3fe in PyObject_Call() > #7 0x080642d3 in instancemethod_call() > #6 0x0805c3fe in PyObject_Call() > #5 0x0810d125 in function_call() > #4 0x080c16a8 in PyEval_EvalCodeEx() > #3 0x08082a95 in _Py_Dealloc() > #2 0x0810a7c6 in frame_dealloc() > #1 0x08082a8a in _Py_Dealloc() > #0 0x08082a1e in _Py_ForgetReference() > > pkaudio: buffer thread exiting. > pkaudio: engine thread exiting. > PKSampler: All daemons stopped cleanly. > [40724 refs] > Fatal Python error: Objects/frameobject.c:403 object at 0x81ff8a4 has > negative ref count -1 > WAD: Collecting debugging information... > WAD: Abort. > #14 0x08054ca1 in ?() > #13 0x4017390c in __libc_start_main() > #12 0x08054d5a in main() > #11 0x08055638 in Py_Main() > #10 0x080e5b61 in Py_Finalize() > #9 0x080e45ca in PyInterpreterState_Clear() > #8 0x080e4a9c in PyThreadState_Clear() > #7 0x08082a95 in _Py_Dealloc() > #6 0x0810a7b6 in frame_dealloc() > #5 0x0807ec70 in _Py_NegativeRefcount() > #4 0x080e838b in Py_AtExit() > #3 0x401885fb in __GI_abort() > #2 0x40187094 in __GI_raise() > #1 0x4003386b in __pthread_raise() > #0 0x401872e1 in __kill() > > > > _______________________________________________ > PyKDE mailing list [EMAIL PROTECTED] > 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