Re: [Discuss-gnuradio] How and where does history() function affect forecast() or the Scheduler's execution

[Eric Blossom]

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

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