[Discuss-gnuradio] Silent exit when changing selector index

[colin]

I'm attempting to run a top block generated by GRC in a Python script,
invoking the getters and setters of the block from another thread.

One frustration is that my script silently exits with code 0 when changing
the output index of a selector with  grc_blks2.selector.set_input_index()
<https://github.com/gnuradio/gnuradio/blob/v3.7.5/grc/grc_gnuradio/blks2/selector.py#L90>
 
. For a split second, things sound fine -- the selection is successful and I
can hear the expected audio. Then the script silently terminates. As best I
can tell from a debugger, something is going wrong inside the /unlock()/
function of the class /hier_block2_sptr/ in a generated file called
//gr/runtime_swig.py/.

This problem only occurs using the lowercase (non-GUI) /start()/ and
/wait()/ to start the top block. When using the uppercase wxgui
/Start(True)/ and /Wait()/, everything is fine.

Anyone have any ideas? Where would error logs be available? Nothing appears
on stdout.



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