Re: light weight user level semaphores

Linus Torvalds
2001-04-19T20:52:19Z

On Thu, 19 Apr 2001, Ingo Oeser wrote:
>
> Are you sure, you can implement SMP-safe, atomic operations (which you need
> for all up()/down() in user space) WITHOUT using privileged
> instructions on ALL archs Linux supports?

Why do you care?

Sure, there are broken architectures out there. They'd need system calls.
They'd be slow. That's THEIR problem.

No sane architecture has this limitation.

Linus