Re: [Discuss-gnuradio] Difference between run and start/stop commands

[address@hidden]

On Wed, 14 Dec 2005 12:24:08 -0500, address@hidden wrote:

>> Most graphs will run forever unless you explicity tell them to stop.
>> The exceptions are those which contain blocks that return -1 from
>> their work function.  This is a kind of EOF indication.  The most common
>> block that returns -1 is gr.file_source.  This allows us to process
>> data from a file and terminate when it's done.  The other block that
>> has this feature is gr.head(sizeof_item, nsamples).  It returns -1
>> after it copies nsamples from its input to its output.  Use it when
>> you want to only run something for a fixed number of samples.

> I couldn't find any such line ( in any file in that directory.  Any ideas?

It's used a lot in the testing script for make check.  Look in the 
gnuradio-core/src/python/gnuradio/gr for the file qa_*.py.

Can't help with the other questions.

Mike

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