Poll'able Queue objects.

[Dan Maas]

> As this didn't seem to exist i have coded a selectable Queue object
> based on pipes (which should thus work under unix and win32).  I have
> included the code below.  If you go to the following URL :

I hate to say it, but this code won't work on Win32 since you can't select()
or WaitForMultipleObjects() on anonymous pipes (thanks, MS!). To get the
expected non-blocking behavior you would have to use threads or a local
socket...

Regards,
Dan