info needed on atomic operations

Hi all,

I need some information on atomic operations. Please provide me some information on how do I do the following operations atomically(for iX86):
(1) set a charecter ( dst = src),
(2) compare and then set a charecter ( if (dst==X) dst = src;)

It would be great If you provide some references to any good documents.

Thanks,
Srini

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