Messages in this thread | | | Date | Sat, 30 Oct 1999 15:42:17 +0200 | From | Matthew Wilcox <> | Subject | Re: FD array expansion problem |
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On Sat, Oct 30, 1999 at 06:16:16PM +1000, Keith Owens wrote: > On Fri, 29 Oct 1999 09:07:15 +0200, > Ralf Baechle <ralf@uni-koblenz.de> wrote: > >MIPS II instruction set and better and the Alpha don't have an xchg > >equivalent but ll / sc instructions, which are more universal. Using > >them to implement an xchg-like implementation however ends up as a > >a loop of at least five instructions which we'de prefarably want to avoid. > > Same problem on i370. No atomic exchange, not even atomic inc, it all > has to be done using compare and swap and loop until successful.
We don't have ll/sc instructions or compare-and-swap on pa-risc. I'd really like to be able to do this without disabling interrupts, but I don't think there's a way.
-- Matthew Wilcox <willy@bofh.ai> "Windows and MacOS are products, contrived by engineers in the service of specific companies. Unix, by contrast, is not so much a product as it is a painstakingly compiled oral history of the hacker subculture." - N Stephenson
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