On Wed, Dec 18, 2013 at 1:39 AM, Sumedha Goyal <sumedha1...@gmail.com> wrote: > > > ---------- Forwarded message ---------- > From: Sumedha Goyal <sumedha1...@gmail.com> > Date: Wed, Dec 18, 2013 at 10:50 AM > Subject: Re: [Discuss-gnuradio] problem with top_block.stop() > To: Tom Rondeau <t...@trondeau.com> > > > Hi > My flowgraph does not stop naturally. I want to stop and start it again > using different value for a parameter as shown in my above question. > There is an event in my program where the flowgraph finishes it's job with > first parameter value (which is 0.8 here), at the occurrence of that event I > want the control of flowgraph to come back to the main(). Then I want to > restart the flowgraph with a new parameter value (which is 0.4 here). > Kindly guide me on this. > > Also, can I forcibly bring the control back to main() even when the > flowgraph doesn't have anything to stop its execution? > > Thanks and Regards, > Sumedha
As I said, tb.wait() is a blocking call. If there is nothing to stop your flowgraph, you will continue to block at the tb.wait() line forever. If it helps, the top_block is implemented as a multi-threaded application where each block is in its own thread. The tb.wait() performs a thread join() on all threads in the flowgraph. So the flowgraph must exit before wait will exit. You have to stop your flowgraph internally somehow to continue. Tom > On Tue, Dec 17, 2013 at 11:24 PM, Tom Rondeau <t...@trondeau.com> wrote: >> >> On Tue, Dec 17, 2013 at 12:23 PM, Sumedha Goyal <sumedha1...@gmail.com> >> wrote: >> > 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 >> >> Does your flowgraph in tb naturally stop? The tb.wait() is a blocking >> call and will halt the main loop there until all threads (blocks) in >> tb are done. If your flowgraph doesn't have something that stops >> execution (like a finite file or a blocks.head block), then it will >> continue to process forever and your tb.wait() will continue to block. >> >> Tom > > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
