<html> <head> <meta http-equiv="content-type" content="text/html; charset=GB2312"> </head> <body text="#000000" bgcolor="#FFFFFF"> 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 <meta http-equiv="content-type" content="text/html; charset=GB2312"> <a href="https://github.com/xiangzhai/pypulseaudio">https://github.com/xiangzhai/pypulseaudio</a> please someone give me advice, thanks a lot! Xiang Zhai </body> </html>