Re: [9fans] commercial deployment

[Ozan Yigit <oz@tiger.cs.yorku.ca>]

humbubba@smarty.smart.net (Rick Hohensee) writes:

> What are "pre-run-time scheduling with constraints" and how does rtlinux
> fail there?

this is not the right forum to discuss rtlinux, but we know that what
they call "hard" is not quite hard enough. :) as for pre-run-time scheduling
[which is really the only practical way to provide the predictibility needed
for serious hard rt] the two seminal papers are:

Jia Xu, David Lorge Parnas, Pre-Run-Time Scheduling of Processes with
Exclusion Relations on Nested or Overlapping Critical Sections.

and

Jia Xu, David Lorge Parnas, Scheduling Processes with Release Times,
Deadlines, Precedence and Exclusion Relations", IEEE Transactions on
Software Engineering, vol. 16, no. 3, March 1990, pp. 360-369.

also see, by way of a faq :)

Jia Xu, David Lorge Parnas, Priority Scheduling Versus Pre-Run-Time
Scheduling. 7-23, Real Time Systems, Vol. 18, Jan 2000.

enjoy. oz
--
www.cs.yorku.ca/~oz	 | if you couldn't find any weirdness, maybe
york u. computer science | we'll just have to make some!   -- hobbes