Re: patent on O_ATOMICLOOKUP [Re: [PATCH] loopable tmpfs (2.4.17)]

Linus Torvalds
2002-05-25T17:27:11Z

On Sat, 25 May 2002, Robert Schwebel wrote:
> >
> > Which is, in my opinion, the only sane way to handle hard realtime. No
> > confusion about priority inversions, no crap. Clear borders between what
> > is "has to happen _now_" and "this can do with the regular soft realtime".
>
> ... which in turn results in the situation that applications must be
> implemented as kernel modules.

That's a load of bull.

It results in the fact that you need to have a _clear_interface_ between
the hard realtime parts, and the stuff that isn't.

Yes, that does imply a certain amount of good design. And it requires you
to understand which parts are time-critical, and which aren't.

> This is only correct for open-loop applications. Most real life apps are
> closed-loop.

Most real life apps have nothing to do with hard-RT.

Linus