[Discuss-gnuradio] Boost error when trying to use gr.msg_queue.delete_head_nowait()

[Colleen Josephson]

I'm trying to use gr.msg_queue.delete_head_nowait() in a python example,

and if I use delete_head_nowait I get this error:

python: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr< <template-parameter-1-1> >::operator->() const [with T = gr_message]: Assertion `px != 0' failed.

Aborted

The blocking version of delete_head works fine.

Here's the code:

while self.keep_running:

            msg = self.rcvd_pktq.delete_head_nowait()

            if msg:

                result = packet_utils2.unmake_packet(msg.to_string(), int(msg.arg1()))

            else:

if len(packet_utils2.uncoded) > 0:

                    result = packet_utils2.unmake_packet(None)

            if result: #make sure it's not null                                              

                ok, payload = result

                m = msg.to_string()

print 'payload"', m

--
Colleen Josephson
http://www.cjosephson.net
Dept. of Electrical Engineering and Computer Science
Massachusetts Institute of Technology
Class of 2013