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On Fri, Oct 08, 2004 at 10:51:59AM +0100, David Laight wrote:

> You can't do atomic increment on sparc, I don't think you can do it on
> ppc

IIRC, it's about 4 instructions on PPC - it has half-atomic instructions:

Lretry:
read-with-reservation
increment
write-if-I-still-have-the-reservation
branch-if-I-didnt Lretry

Works on cached memory only.

	-is

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