[time-nuts] FreeBSD, NetBSD, or Minix-III?

[Hal Murray]

> In which case, if you're saddled with 32 bit (or 8 bit!) reads, you
> have to do multiple reads, so that by the end of the process, you can
> assure yourself it's consistent.

> E.g read high, read low, read high, read low So you can check low #1
> against low #2, and figure out if you had a roll over. 

Why read the low twice?

I though the normal recipe was to read high, low, high.  If the two highs are 
the same you know a carry didn't happen so a high/low pair is a valid reading.

-- 
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