Messages in this thread | | | Date | Sat, 16 Mar 2002 18:13:38 -0700 | From | yodaiken@fsmlabs ... | Subject | Re: 2.4.18 Preempt Freezeups |
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On Sun, Mar 17, 2002 at 01:33:04AM +0100, Daniel Phillips wrote: > On March 16, 2002 01:40 am, yodaiken@fsmlabs.com wrote: > > > > Without preempt: > > x = movefrom processor register; // if preemption is on, we can be preempted and restart // on another processor so x will be wrong > > do_something with x > > > > is safe in SMP > > With [preempt] it requires a lock. > > It must be a trick question. Why would it?
See comment.
> > -- > Daniel
-- --------------------------------------------------------- Victor Yodaiken Finite State Machine Labs: The RTLinux Company. www.fsmlabs.com www.rtlinux.com
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