[LLVMdev] Proposal for a new LLVM concurrency memory model

[Lacey, Mark]

> Hi all,
> 
> Chandler, Owen, and I have written up a proposal for a new memory
> model and atomic intrinsics in LLVM, which will make it possible to
> support Java and the upcoming C++0x standard. The proposed changes to
> the LangRef are at
> <http://docs.google.com/View?docID=ddb4mhxz_22dz5g98dd&revision=_latest
> >,
> and a rationale for some of the more surprising changes is at
> <http://docs.google.com/View?docID=ddb4mhxz_24gh4ksvgh&revision=_latest
> >.

>From a first glance, it looks like double-wide compare exchange is missing.
See http://en.wikipedia.org/wiki/ABA_problem for an example of where it's
very useful.

Mark

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