How and where does history() function affect forecast() or the Scheduler's execution

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1

Hi Friends

I understand the idea behind using history() in the Gnuradio blocks but
there is one thing that I would like to know in order to understand the
rationale behind using it. I looked at ‘gr_single_threaded_scheduler.cc’
to
gain an understanding of scheduler implementation and understood how the
forecast() method plays a role. But I wasn’t able to figure out how
history() affects its execution. In a previous post Eric said that it
affects the way forecast() behaves and suggested to look at forecast().
But
I am not sure of where to look. Can someone tell me where to look at ?

Thanks
Ali

Mir Murtuza Ali
Graduate Student
Center for Wireless Communications
University of Mississippi
University, MS 38677
Ph : (M) 662-202-5472 , ® 662-513-9903

2

On Tue, Aug 19, 2008 at 11:16:17PM -0500, Murtuza wrote:

Thanks
Ali

It’s used in the implementation of forecast in gr_sync_block.cc,
gr_sync_interpolator.cc and gr_sync_decimator (indirectly).

In looking at the code, I think there’s a long standing latent bug
in gr_block’s forecast, which should be using history in it’s stub
implementation. I’ve opened ticket:262.

Eric