Fwd: problem with top_block.stop()

---------- Forwarded message ----------
From: Sumedha G. [email protected]
Date: Wed, Dec 18, 2013 at 10:50 AM
Subject: Re: [Discuss-gnuradio] problem with top_block.stop()
To: Tom R. [email protected]

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

On Wed, Dec 18, 2013 at 1:39 AM, Sumedha G. [email protected]
wrote:

My flowgraph does not stop naturally. I want to stop and start it again
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

Hi Tom,

I have removed tb.wait(). Now the sequence is

tb=top_block(options,0.8)
tb.start()
sleep(3)
tb.stop()

I want my program to stop here and take new values which is not
happening
right now. It executes till sleep(3) and then hangs somewhere.

You have asked to stop the flowgraph internally, kindly suggest a way to
do
that. As I have mentioned earlier too, I have an event in the work()
function which when occurs the flowgraph should be terminated.
I tried using thread.exit in work function but unfortunately it is
terminating the whole program.

Kindly suggest a way to bring the control back to main loop.

Regards,
Sumedha

Hi

I used a blank work() function as follows

def work(self,ins,outs):
print " i m in work "
self.mark_done()

using "mark_done(), I got the control back in the main loop.

When I use my specific work() function with mark_done() after a
successful
event, I get following error message:

ASSERT FAIL
/usr/local/software/gnuradio-3.6.4.2/gras/lib/gras_impl/output_buffer_queues.hpp:60
not this->empty(i)
Traceback (most recent call last):
File “/usr/local/lib/python2.7/dist-packages/gras/GRAS_PyBlock.py”,
line
230, in _Py_work
ret = self.work(input_arrays, output_arrays)
File “/usr/local/software/working_TRANS_19/new_split_tx.py”, line 304,
in
work

self.send_pkt_phy(self.outgoing_msg,self.arq_expected_sequence_no,self.h,DATA_PKT)
File “/usr/local/software/working_TRANS_19/new_split_tx.py”, line 324,
in
send_pkt_phy
buff = self.get_output_buffer(PHY_PORT)
File “/usr/local/lib/python2.7/dist-packages/gras/GRAS_Block.py”, line
231, in get_output_buffer
def get_output_buffer(self, *args, **kwargs): return
_GRAS_Block.Block_get_output_buffer(self, *args, **kwargs)
RuntimeError: ASSERT FAIL not this->empty(i)

Could you help me in sorting this out?

Regards,
Sumedha

On Wed, Dec 18, 2013 at 11:29 AM, Sumedha G. [email protected]
wrote:

right now. It executes till sleep(3) and then hangs somewhere.
Sounds like an internal problem with your block.

You have asked to stop the flowgraph internally, kindly suggest a way to do
that. As I have mentioned earlier too, I have an event in the work()
function which when occurs the flowgraph should be terminated.
I tried using thread.exit in work function but unfortunately it is
terminating the whole program.

Kindly suggest a way to bring the control back to main loop.

Regards,
Sumedha

Don’t use thread.exit (pretty much ever). This sounds like you have
something wrong with the threading model in your block. You a source
block from GNU Radio (analog.sig_source_c or something) just to make
sure the rest of the flowgraph is behaving properly. That is, that
tb.stop is actually stopping the flowgraph. Then go back and try and
debug your block.

Tom

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