select() for small sleep

I wrote:

>
> There are a couple of other places where [select()] is used for small
> sleeps (storage/lmgr/s_lock.c and access/transam/xact.c) - those
> should possibly be abstracted out (Windows doesn't behave well there
> anyway, I believe - with 0 FDs I read somewhere it returns immediately
> regardless of the timeout setting).
>

What is the preferred way to handle these 2 cases? We could handle them
with #ifdef'd code inline, or create a new function pg_usleep(), or
possibly handle it with conditional macros inline. If a new function or
macro, where should they go?

cheers

andrew