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I was looking a bit at the VAX code now, since performance seems to have
dropped seriously lately, and I noticed that mutex, lock, and possibly
other operations to handle locking out of threads, interrupts, and
multiprocessors are implemented via a software implementation of CAS on
This can hardly be efficient, and I wonder if there is any specific
reason for this, or if it might be worth some work to rewrite these to
as far as possible use VAX primitive instructions for the needs instead.
Anyone have any thoughts or ideas? Opinions? Maybe someone who was
involved in the current implementation can share some thoughts on why it
was done the current way? Maybe I'm missing something?
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