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SubjectRe: Multi-threading
Date
On Monday 11 March 2002 12:36, Dipankar Sarma wrote:
> In article <20020311182111Z310364-889+120750@vger.kernel.org> Brad Pepers
wrote:
> > There was a message posted by Jim Starkey about his experiences using
> > threads on Linux and the problems debugging them. It came down to two
> > things:
> >
> > 2. Linux is missing an atomic use-count mechanism which returns values
> > like the Microsoft InterlockedIncrement/Decrement functions do.
>
> Can't this be done using atomic_dec_and_test() and the likes ?
> Google tells me that windoze InterlockedIncrement/Decrement stuff
> does the almost same thing. Why can't refcounting be
> implemented using just atomic_inc/dec and/or atomic_inc/dec_and_test ?

The atomic_dec_and_test certainly handles the most often used case and is
good enough. Apparently it would be nice to have the value back sometimes
too though.

The atomic_inc_and_test is not much good though since the case you most often
want to track is the 0 to 1 transition and not -1 to 0!

--
Brad Pepers
brad@linuxcanada.com
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