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Re: spinlock

Hello Jan.

Dne petek 28. februar 2003 11:41 je Jan Hudec napisal(a):

> On Fri, Feb 28, 2003 at 12:29:54AM +0100, Rok Papež wrote:

> YES, IT DOES. Except _irqsave/_irqrestore variants (they reduce to
> cli/sti). And for 2.4, that is. With preempt patched (IIRC they are
> included in late 2.5) they become magic.

:-). I had _irqsave/_irqrestore in mind.

> > I use them on UP as mutexes.. heavily. You use spinlock if structures you
> > are protecting are being accessed from interrupt/timer/softirq context.
>
> Only _irqsave/_irqrestore variants! Unsing the normal variant to lock
> against interrupt is a bug under penalty of complete machine freeze.

Yes.
-- 
best regards,
Rok Papež.

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