anyone define port types?

[Andy Wingo]

Hi!

I am working on improving our port implementation to take advantage of
the opportunity to break ABI in 2.2.  I am wondering how much I can
break C API as well -- there are some changes that would allow better
user-space threading
(e.g. http://thread.gmane.org/gmane.lisp.guile.devel/14158/focus=15463
or Chris Webber's 8sync).  But those changes would require some
incompatible changes to the C API related to port internals.  This API
is pretty much only used when implementing port types.  So, I would like
to collect a list of people that implement their own ports :) I know
Guile-GNOME does it for GNOME-VFS, though GNOME-VFS is super-old at this
point...  Anyway.  Looking forward to your links :)

Andy