ntdll: make NtDelayExecution a bit more efficient

[Juan Lang]

On Fri, Mar 8, 2013 at 6:11 AM, Graham Knap <graham.knap at gmail.com> wrote:

> Michael Stefaniuc wrote:
> >> i.e. commit 8099c2b9. JW says "... to more closely resemble Windows
> >> behavior.  The key is to yield in a Sleep..."
> >
> > JW is Jeremy White so us old timers chuckle now ;)
>
> I know the name, but nothing more. Why is this funny?
>

He's the CEO of Codeweavers, and he's the first one to admit he doesn't
write great code, or at least that Alexandre rejects his code a lot :)

> If the ancient wisdom isn't backed by tests there's a fair chance that
> > it might not be applicable today. Or that it was a wrong theory
>
> Interesting. Unfortunately, I have no idea how to go about writing
> tests for this. Can anyone offer any suggestions?
>

It's, well, hard to test. MSDN suggests it was true in XP, but subsequently
changed:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms686298(v=vs.85).aspx

I no longer recall which app it was Jeremy was working on fixing, but there
was at least one app that depended on this behavior. See Jeremy's posts on
"RFC: yield on Waits" and "Threading issues".
--Juan
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