[boost] Python Extension/Callback from VOCAL SIP stack available frm www.vovida.org

From: Raghavan Kripakaran (rkripa_at_[hidden])
Date: 2002-04-01 23:12:29

Hi,

I am using an open source Session Initiation Protocol (SIP) stack from
www.vovida.org.  My goal is to write python extensions, which will enable a
python users with SIP support. For example MSN-4.6 uses SIP to
setup/teardown phone calls over the internet.

VOCAL sip stack is multithreaded and implemented using C++.  I have created
a simple C++ wrapper and created extensions using the boost python library,
which I am able to call from python.

I would like to have callbacks implemented in python, which gets called when
a SIP event or message is receieved by the sip stack.  So I created a C++
wrapper class say 'Base' with virtual methods.  Then I inherited a 'Derived'
class in python from the C++ class 'Base'.  The python Derived virtual
methods were defined.   I instantiated a Derived python object and passed it
on to the C++ wrapper, which I was expecting it to be called by the VOCAL
sip stack on receiving a SIP message over the wire.  I am running into
threading issues when the VOCAL sip stack basically calls the python
callback derived object.

I am looking for pointers or any sample application which implements a
callback which is gets executed in the python enviroment, when a C++
extension modules gets a trigger.

If anyone has done a similar callback from C++ extension to a python object
please help me.

Please ignore if I have posted my question on the wrong list.

Thanks

Regards,
Raghavan