Re: [PATCH] udev enhancements to use kernel event queue

Robert Love
2003-06-12T23:34:56Z

On Thu, 2003-06-12 at 16:40, Paul Mackerras wrote:

> BZZZT. If another CPU is also doing atomic_inc_and_read you could end
> up with both calls returning the same value.

That is what I thought. Damn.

> You can't do atomic_inc_and_read on 386. You can on cpus that have
> cmpxchg (e.g. later x86). You can also on machines with load-locked
> and store-conditional instructions (alpha, ppc, probably most other
> RISCs).

So this is doable on everything but old i386 chips... hrm.

Robert Love