How to delay until a next increment of time occurs ?

[R.Wieser]

Dietmar,

> It *is* real-time...
> Real-time is not about speed, but about guaranteed timing.

What I tried to indicate is that the Pi has 500,000 cycles to work with 
between two of those time events.   I consider that to be quite a few.

> at least not on a  multitasking non-realtime system.

Yep, that's ofcourse the killer in this game.

Regards,
Rudy Wieser