Blei/claytracks — comment on commit b9d81637595cd0920463a2b5807229c20305471d
File: parallel/parallel.unix.clay line 19
By jckarter:

On x86 at least, `lock cmpxchg` is always SeqCst, so the order argument really doesn't matter in that case. But in general, SeqCst is a good default. The less strict orderings are for fairly specialized purposes.