On Thu, Apr 14, 2011 at 1:21 AM, Josh Blum <j...@joshknows.com> wrote:
> > > Without getting to deep into this, the problem is in the shared > > responsibilities between the Python world and the C++ world. I don't > > completely understand the series of events, but the crux o the problem > seems > > to be who gets to the destructors first. > > > > its never easy is it... > > In the case of your program, it's the self._qtgui_sink_x_0_win object > that's > > the problem. If you don't make it a member of the class, that is, drop > the > > "self." part, it _should_ work fine. My understanding, which could be > wrong, > > is that as a local variable, it gets destroyed in the right order. > > > > I removed the "self." and still seeing the same results. > > But, you gave me an idea that there might be this unhappy deconstructor > race condition. So, I tried deleting the qapp after exec() and that made > it better. Also and rather, stopping the top block make it better; so > maybe it was getting data to draw and somebody already destroyed the qt > graphics stuff. > > So, the reason I didnt stop the top block: > http://gnuradio.squarespace.com/examples > > I will give this a more conclusive test tomorrow, but the fix seems > worth while anyhow. > > http://gnuradio.org/cgit/gnuradio.git/commit/?id=e762abc703e3224b54466685bf51b3fa90ee8edc > > -Josh > Hmm... that's very disappointing. I was unable to reproduce this on three of my machines (Core2Quad, i7, and i7 (sandybridge)) and a couple of VMs. But I did see a segfault about once in twenty on my Core2Duo. So that that for what you will. I tried your fix and also applied the fix to pyqt_example_f.py and ran both about 50 times in a row without seeing the seg fault, so that seems to fix it. Either that, or it just reduces the probability of it occurring even more.... But I think we go with it until someone reports another problem. Good catch, thanks! Tom
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