Hi. I have found why my program was deadlocking. in py_pjsua.c in function static PyObject *py_pjsua_handle_events(PyObject *pSelf, PyObject *pArgs) I have commented lines Py_BEGIN_ALLOW_THREADS and Py_END_ALLOW_THREADS those are python macro witch allow other python threads to run while current thread is in some long running IO aperations for example. Also i get rid of worker_thread to poll with handle_events() .. now i am polling from the thread where all other calls to py_pjsua lib is located. Maybe the deadlocking situation was like this: a worker thread called hanle_events inside handle events .. some pjsua internal functions is called to get events.. mutexes acquired. now a context switches.. ( because we have other python threads and Py_BEGIN_ALLOW_THREADS was called) context switched to other python thread calling another py_pjsua func.. so another pjsua internal function is entered.. This must not be a problem as long as mutexes acuried in the same order.. and in FAQ it is stated that in pjsip acquires mutexes in one order.. I dont know i think i saw 2 different macro.. in pjsua .. a try_to_get_mutex and get_mutex.. maybe problem in this. Ok. i am not stating pjsua have a deadlock bug, maybe this was my bad application design or i messed up somewhere else. But my app design a little bit mimics design of app in example http://svn.pjsip.org/repos/pjproject/trunk/pjsip-apps/src/py_pjsua/pjsua_app.py 1 worker thread.. and also calls from other thread.. So i assume that example also have a deadlock problem.. it is just a metter of load.. achitecture gived in example worked for me if i had 1 simul call.. and when i started with 16 simul calls it is deadlocked in about 1-5 minutes.. (and as i can see from debug it is deadlocked in a call to py_pjsua) Btw in example - another thread (main in example and not main in my app) is not registered with py_pjsua.thread_register() .. so what threads examply must be registed i am not getting it. Now i have no worker thread... i am polling right from the thread where all other calls to pj_pjsua located and also removed Py_BEGIN_ALLOW_THREADS from handle_events to disallow interleave of threads while i am in handle_events(). So anyone working from python with pjsua can do the same if having unexpected problems with deadlocks :) Best wishes for developers of pjsua, nice work :)
