[Discuss-gnuradio] problem with top_block.stop()

[Sumedha Goyal]

I am trying to pass two different parameters to my top_block class 
I m not able to do this please help. The control of program gets stuck at tb.stop() and doesn't go beyond that.

tb=top_block(options,0.8)
tb.start()
tb.wait()
tb.stop()
sleep(5)
print "I AM BACK"
tb1=top_block(options,0.4)
tb1.start()
tb1.wait()
tb1.stop()
sleep()

Regards,

Sumedha