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So there are vendors out there that alter the behavior of volatile to act like a mutex in multi-threaded environments but don't tell anyone? Ugh.

Well, TI doesn't do that thankfully. At least not for the MSP430.

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for a while Microsoft gave volatile acquire/release semantics, which implied a barrier on non-x86 cpus. They recognized it was a mistake backtracked on that around the time they started their effort to run Windows on ARM.

How did you draw that conclusion? People have been warning about volatile for years

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