Question about non-blocking Windows pipes

[Ken Brown]

Hi Corinna,

There are several places in fhandler_socket_unix.cc where you make a distinction 
between the blocking and nonblocking cases with code like this:

   cygwait (evt ?: get_handle (),...)

Here evt is an event handle in the blocking case and is NULL in the nonblocking 
case.  See, for example, fhandler_socket_unix::listen_pipe.

What's the reasoning behind this?  Why not just always create an event or always 
use the handle?  I guess I don't understand what Windows does differently in the 
two cases.

Thanks.

Ken