Fg.run() doesn't return if gr.head() is used

Hey Guys

I used gr.head() as my source, so I assumed fg.run() should be able to
return, but it doesn’t. Anybody has any idea which could be the reason?
Here
is the error message if I press ctrl+C to stop the program.

mygraph.run()

File
“/usr/local/lib/python2.5/site-packages/gnuradio/gr/flow_graph.py”,
line 113, in run
self.wait ()
File
“/usr/local/lib/python2.5/site-packages/gnuradio/gr/flow_graph.py”,
line 104, in wait
self.scheduler.wait ()
File
“/usr/local/lib/python2.5/site-packages/gnuradio/gr/scheduler.py”,
line 68, in wait
thread.join(timeout)
File “/usr/lib/python2.5/threading.py”, line 569, in join
self.__block.wait(delay)
File “/usr/lib/python2.5/threading.py”, line 233, in wait
_sleep(delay)
KeyboardInterrupt

Thanks.

Dawei

On Thu, Aug 09, 2007 at 09:32:56PM -0400, Dawei Shen wrote:

Hey Guys

I used gr.head() as my source, so I assumed fg.run() should be able to
return, but it doesn’t. Anybody has any idea which could be the reason? Here
is the error message if I press ctrl+C to stop the program.

It should stop. However, if you happen to be using gr.udp_source or
anything else that is in the habit of returning a zero count from
work, it won’t return.

Eric

Hi, Eric and Johnathan

Thank you guys for the quick answer. I have done some tests with my code
and
got the following observation: I used a low-pass filter in the
processing
chain, if the decimation rate is set to 1, then fg.run() can return; if
the
decimation rate is set to any other integers, fg.run() won’t. I am not
sure
whether this is something random in my machine or caused by the code
itself.

BTW: Eric, you mentioned the gr_udp_source, I am quite interested in it,
is
there any example in the svn using this block? If so, please point some
of
them to me. Thanks.

Dawei

Hi, Johnathan

Thank you for the answer. But what’s the difference between the new
blocks
and old blocks? Thanks.

Dawei

Dawei Shen wrote:

BTW: Eric, you mentioned the gr_udp_source, I am quite interested in it,
is there any example in the svn using this block? If so, please point
some of them to me. Thanks.

See gnuradio-examples/python/hier/networking.

These use the new-style flowgraph code, but you can see the
instantiation of gr.udp_source and _sink and how they are used.


Johnathan C.
Corgan Enterprises LLC
http://corganenterprises.com

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