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> If a routime called by a lua_CFunction longjmps way back (bellow the
> point where the lua machine  was called) would the lua machine be
> still usable?

Not exactly... The thread that did the longjmp should not be used.
You could use other threads, but I am not sure whether that would
be completely safe either.

> If it doesn't, Is there a way to protect  the machine from such
> backward jumps .

How do you protect them in ethereal?

-- Roberto