Poul-Henning Kamp wrote:
In message <4a0ebdee.2020...@erols.com>, Chuck Harris writes:
A "watch" isn't exactly a challenge to an operating system.
Well, no.
But figuring out correct handling of time is a challenge for operating
system programmers.
Very true...
I have no idea how the timing code is in minix3, but I do know
how much time it took me and subsequently Warner to get it right
and good in FreeBSD.
Given that minix was written by a CS professor who has no apparent
experience with real time operations, and has never been heard from
on timenuts, I would guess it will be primitive.
I'll still claim that FreeBSD is a generation ahead of all other
operating systems with respect to timekeeping, if for no other
reason, because FreeBSD is the only OS that truly splits the
nanosecond.
I don't believe that will be happening in a message passing microkernel
(like minix) anytime soon... unless you build all of the timekeeping
software into the kernel, and then you are in the process of becoming
a monolithic kernel ;-)
-Chuck Harris
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