[Info-vax] Volatile, was: Re: yet another sys$qiow question

[JF Mezei]

The reason I had been given for not using ASTs and using a loop for hard
real time was that they could ensure timing on a known event loop while
AST delivery was unpredictable since something else could stop AST
deliveries and delay processing etc.

(Just recounting what I was told).

Similarly, on space station, they used a very old military slow network
type that is polled at predictable times because they felt ethernet was
unpredictable because you might have a collision. (not considering the
fact that with Ethernet 100 times faster than that military protocol
would have no problem handling the load generated by those devices).