This seems a good source with the ref to LOCK in x86 ( which is support to
make any
instruction atomic across cores :o )

http://www.moserware.com/2008/09/how-do-locks-lock.html

If someone with knowledge can confirm it is decent reading.
( apparently other cpu use other stuff.. i wonder how it is done on ARM )

Kudos to all working on this very difficult matter

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Knowing is not enough; we must apply. Willing is not enough; we must do

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