To clarify, there was one missing line. Here is the snippet again,
with comments:
if __name__ == '__main__': # Execute if script invoked
as program
tb = my_top_block() # Create an instance
of a custom top block
tb.start() # Start
the flowgraph running in background thread
raw_input("Press Enter to stop.") # Wait for user to hit enter
in foreground thread
tb.stop() # Tell
flowgraph to gracefully exit
tb.wait() # Wait for
it to do so
--
Johnathan Corgan
Corgan Enterprises LLC
http://corganenterprises.com/
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