[Discuss-gnuradio] Scheduler enhancement?

[Marcus D. Leech]

I've been playing some lately with devices that don't provide an 
inherent hardware timestamp, yet which can be run from a common clock,
  and made coherent using cross-correlation estimation of timing offset.

Something that would make this easier--in that it would establish a 
starting-point for cross correlation, and thus reduce the window size
  over which one needs to estimate, would be if the scheduler could 
insert a time tag of some sort the FIRST time it calls a work function
  either initially or after a start() stop() start() sequence.  This 
would be crude, since it would be based on an OS-based timer, so it could
  only act as a starting point.

That would allow one to then write a generic synchronizer block that 
used a combination of rx_crude_time, and actual cross-correlation.

Is this a dumb idea?