At 02:05 PM 04/18/2001, Matti Aarnio wrote:
>On Wed, Apr 18, 2001 at 11:08:22AM -0400, Dennis wrote:
> > Does 2.4 have something similar to spl levels or does it still require the
> > ridiculous MS-DOSish spin-locks to protect every bit of code?
>
> Lets see -- (besides of MSDOS not having any sort of spinlocks), the
> spl() is something out of VAX series of machines, and it really works
> by presuming that there is some sort of priority leveling among irq
> sources.
I was referring to the infamous CLI/STI combinations that are more
analogous to spinlocks than anything you are talking about. spl levels are
clean and transparent and have been doing a very nice job in helping to
avoid race conditions in real unix systems for quite some time now.
db
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