? 2013?02?23? 11:34, Xiang Zhai ??: > Hi PulseAudio developers, > > I am developing PulseAudio Python Binding in C based on > pa_threaded_mainloop to handle pa_context_subscribe callback. > > For example, when received PA_SUBSCRIPTION_EVENT_SINK > PA_SUBSCRIPTION_EVENT_CHANGE event, I used PyEval_CallFunction to call > Python (pygtk.py) callback. > Then pygtk.py testcase throw segfault, gdb DEBUG shown as below: > > Program received signal SIGSEGV, Segmentation fault. > [Switching to Thread 0x7fffebb3f700 (LWP 10150)] > 0x00000000004e9f20 in PyObject_Call () > (gdb) bt > #0 0x00000000004e9f20 in PyObject_Call () > #1 0x00000000004ea396 in PyEval_CallObjectWithKeywords () > #2 0x0000000000478a99 in PyEval_CallFunction () > #3 0x00007fffed1969b6 in ?? () from > /usr/lib/x86_64-linux-gnu/libpulse.so.0 > #4 0x00007fffecd45693 in ?? () from > /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so > #5 0x00007fffecd45a03 in pa_pdispatch_run () from > /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so > #6 0x00007fffed18cbdd in ?? () from > /usr/lib/x86_64-linux-gnu/libpulse.so.0 > #7 0x00007fffecd4a2a9 in ?? () from > /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so > #8 0x00007fffed19fa1e in pa_mainloop_dispatch () from > /usr/lib/x86_64-linux-gnu/libpulse.so.0 > #9 0x00007fffed19fde5 in pa_mainloop_iterate () from > /usr/lib/x86_64-linux-gnu/libpulse.so.0 > #10 0x00007fffed19fe90 in pa_mainloop_run () from > /usr/lib/x86_64-linux-gnu/libpulse.so.0 > #11 0x00007fffed1ae30f in ?? () from > /usr/lib/x86_64-linux-gnu/libpulse.so.0 > #12 0x00007fffecd57d18 in ?? () from > /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so > #13 0x00007ffff7bc4e9a in start_thread (arg=0x7fffebb3f700) at > pthread_create.c:308 > #14 0x00007ffff69b3cbd in clone () at > ../sysdeps/unix/sysv/linux/x86_64/clone.S:112 > #15 0x0000000000000000 in ?? () > > I tried to add PyGILState_Ensure() & PyGILState_Release() around > PyEval_CallFunction() for locking/unlocking, it still throw another > segfault shown as below: > > Program received signal SIGSEGV, Segmentation fault. > [Switching to Thread 0x7fffebb3f700 (LWP 10362)] > sem_post () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S:34 > (gdb) bt > #0 sem_post () at ../nptl/sysdeps/unix/sysv/linux/x86_64/sem_post.S:34 > #1 0x00000000004d456e in PyGILState_Release () > #2 0x00007fffed1969b6 in ?? () from > /usr/lib/x86_64-linux-gnu/libpulse.so.0 > #3 0x00007fffecd45693 in ?? () from > /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so > #4 0x00007fffecd45a03 in pa_pdispatch_run () from > /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so > #5 0x00007fffed18cbdd in ?? () from > /usr/lib/x86_64-linux-gnu/libpulse.so.0 > #6 0x00007fffecd4a2a9 in ?? () from > /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so > #7 0x00007fffed19fa1e in pa_mainloop_dispatch () from > /usr/lib/x86_64-linux-gnu/libpulse.so.0 > #8 0x00007fffed19fde5 in pa_mainloop_iterate () from > /usr/lib/x86_64-linux-gnu/libpulse.so.0 > #9 0x00007fffed19fe90 in pa_mainloop_run () from > /usr/lib/x86_64-linux-gnu/libpulse.so.0 > #10 0x00007fffed1ae30f in ?? () from > /usr/lib/x86_64-linux-gnu/libpulse.so.0 > #11 0x00007fffecd57d18 in ?? () from > /usr/lib/x86_64-linux-gnu/libpulsecommon-1.1.so > #12 0x00007ffff7bc4e9a in start_thread (arg=0x7fffebb3f700) at > pthread_create.c:308 > #13 0x00007ffff69b3cbd in clone () at > ../sysdeps/unix/sysv/linux/x86_64/clone.S:112 > #14 0x0000000000000000 in ?? () > > However, the console.py (non-gtk & no g_main_loop) testcase worked > happily without segfault! > > The source code and testcase host on github > https://github.com/xiangzhai/pypulseaudio please someone give me > advice, thanks a lot! > > Xiang Zhai Fixed https://bugs.freedesktop.org/show_bug.cgi?id=61328 I will give my sincere thanks to Tanu Kaskinen :) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20130223/64bdab1c/attachment.html>
