> Bar any bug, am I to understand, that a program off in user
> land, could never, ever, ever, cause a cpu to spin forever?
With the exception of programs run as root that use iopl or go digging
in /dev/mem and banging hardware directly - yes.
> (Seriously thou)
> Can a process cause a cpu to spin, over and over and over again?
> Or does a spinning thread get put to sleep by the kernel?
If you spin continually you will use your cpu time up. You also dont stop
interrupts when in user space so the impact is nil
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