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adding functions for easy access to cycle counters
Does anyone have an opinion on adding functions in
src/common/lib/libc/atomic for reading CPU cycle counters? I thought
of this while working on a JACK audio package: I've already converted
it to use the atomic ops in userland. If I had an MI function to read
the cycle counter, e.g. rtdsc on x86, then it could build easily on
any platform NetBSD-current supports.
These functions don't _have_ to be located with the atomic ops, I just
figured it was a logical place to put them.
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