Inter-process communication

I would like to use the LISTEN and NOTIFY features of Postgres to implement
communication between to proceses connected to Postgres, but I don't want
to "listening" process to use polling to detect notifications. The
following polling example is given in the Postgres documentation:

while (1)
{
/*
* wait a little bit between checks; waiting with select()
* would be more efficient.
*/
sleep(1);
/* collect any asynchronous backend messages */
PQconsumeInput(conn);
/* check for asynchronous notify messages */
while ((notify = PQnotifies(conn)) != NULL)
{
fprintf(stderr,
"ASYNC NOTIFY of '%s' from backend pid '%d' received\n",
notify->relname, notify->be_pid);
free(notify);
}
}

Instead, I would rather use the "more efficient select(2)" method alluded
to in the Postgres documentation (and code above). Does anyone have
sample code that uses this method to wait for a backend notification to
arrive?

Thanks in advance...

Steven Bradley
Lawrence Livermore National Laboratory
sbradley(at)llnl(dot)gov