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-.\" This is -*-nroff-*-
-.\" XXX standard disclaimer belongs here....
-.\" $Header: /cvsroot/pgsql/doc/man/Attic/notify.l,v 1.1.1.1 1996/08/18 22:14:26 scrappy Exp $
-.TH "NOTIFY" SQL 11/05/95 Postgres95 Postgres95
-.SH NAME
-notify \(em signal all frontends and backends listening on a class
-.SH SYNOPSIS
-.nf
-\fBnotify\fR class_name
-.fi
-.SH DESCRIPTION
-.BR notify
-is used to awaken all backends and consequently all frontends
-that have executed 
-.IR listen (l)
-on
-.IR class_name .
-This can be used either within an instance-level rule as part of the
-action body or from a normal query.  When used from within a normal
-query, this can be thought of as interprocess communication (IPC).
-When used from within a rule, this can be thought of as an alerter 
-mechanism.
-.PP
-Notice that the mere fact that a 
-.BR notify
-has been executed does not imply anything in particular about
-the state of the class (e.g., that it has been updated), nor
-does the notification protocol transmit any useful information 
-other than the class name.  Therefore, all
-.BR notify
-does is indicate that some backend wishes its peers to examine
-.IR class_name
-in some application-specific way.
-.PP
-This event notification is performed through the Libpq protocol
-and frontend application interface.  The application program
-must explicitly poll a Libpq global variable,
-.IR PQAsyncNotifyWaiting ,
-and call the routine
-.IR PQnotifies
-in order to find out the name of the class to which a given
-notification corresponds.  If this code is not included in 
-the application, the event notification will be queued and 
-never be processed.
-.SH "SEE ALSO"
-define rule(l),
-listen(l),
-libpq.