Re: 2.4.18 Preempt Freezeups
yodaiken@fsmlabs.com
Fri, 15 Mar 2002 20:12:40 -0700
On Fri, Mar 15, 2002 at 05:46:15PM -0800, Mike Fedyk wrote:
> On Fri, Mar 15, 2002 at 05:40:36PM -0700, yodaiken@fsmlabs.com wrote:
> > On Fri, Mar 15, 2002 at 02:11:49PM -0500, Robert Love wrote:
> > > If you "poke the processor", to be SMP-safe, you should hold a lock to
> > > prevent multiple concurrent "pokings of the processor" - thus you become
> > > preempt-safe.
> >
> > Without preempt:
> > x = movefrom processor register;
> > do_something with x
> >
> > is safe in SMP
> > With SMP it requires a lock.
> >
>
> "With preempt it requires a lock" you mean?
Yep. Keyboard Operator error.
--
---------------------------------------------------------
Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.
www.fsmlabs.com www.rtlinux.com
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