Re: SMP syncronization on AMD processors (broken?)
From: Christopher Friesen
Date: Tue Oct 11 2005 - 21:27:44 EST
The right thing to do here is to wait for the flag to be set *outside*
the lock, and then re-validate inside the lock:
This may work on some processors, but on others the read of "progress"
in XXX, or the write in YYY may require arch-specific code to force the
update out to other cpus.
Alternately, explicitly atomic operations should suffice, but a simple
increment is probably not enough for portable code.
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