[postmodern-devel] PATCH: Add support for asynchronous notifications

Attached is a patch that adds Postmodern support for asynchronous notifications, as documented here:

http://www.postgresql.org/docs/current/static/sql-listen.html

http://www.postgresql.org/docs/current/static/sql-notify.html

http://www.postgresql.org/docs/current/static/sql-unlisten.html

and

http://www.postgresql.org/docs/current/interactive/protocol-message-formats.... (under "NotificationResponse")

It updates MESSAGE-CASE to watch for async notifications and, by default, issue a warning that looks very similar to what the psql client displays for async notifications:

WARNING: Asynchornous notification "lisp" received from server process with PID 22063.

It also adds a blocking function, WAIT-FOR-NOTIFICATION, that adds a handler-bind around the warning and returns the notification data when a notification is received.

The patch isn't complete, though -- I wasn't sure how best to integrate the new public function, condition, and condition accessors into the documentation. How should I proceed?

Zach