Am 2014-12-16 03:54, schrieb ron minnich:
Notwithstanding the merits of the idea, does anyone know if this is
doable or I am just misremembering?
Since even LOCK REP ... is not allowed, I think you're misremembering.
LOCK provides atomicity guarantees for the single instruction it covers,
nothing else.
What's typically used in situations like your example is cmpxchg: load
the value, copy it, modify, then atomically exchange ram and register
content. compare exchanged value with copy to make sure there was no
interference, otherwise restart.
Patrick
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