Availability of pg_backend_pid() immediately after connection establishment - Mailing list pgsql-general

Someone in this group mentioned a while back that pg_backend_pid()
function works only after some 1/2 second after the connection has been
established.  This had something to do with the stats collector to make
its sweep every .5 seconds?.  Does anyone have more information on this?

Any help is appreciated
--
Hari