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> > > + R gets the previous A regardless if A is updated with B or not.
> > > + To see if the update was successful a compare of R == C may be used.
> > safe) cmpxchg. Is it OK to use cmpxchg in architecture-independent code?
> acquire the lock in NMI context, we simply drop the packet.
please select the implementation at run-time instead of build time.
support is determined at run-time.
> Are these archs without cmpxchg and NMIs, a concern for you?