postmaster shutdown failed

Hello All,

After starting the postmaster, I just entered in
database like:

$ psql test
Welcome to psql 7.4.2, the PostgreSQL interactive
terminal.

Type: \copyright for distribution terms
\h for help with SQL commands
\? for help on internal slash commands
\g or terminate with semicolon to execute query
\q to quit

test=# LOG: received smart shutdown request
test=#

When I stop the postmaster in another session or in
terminal, I got the following error:

$ pg_ctl -D /var/opt/iexpress/postgresql stop
waiting for postmaster to shut
down................................................................
failed
pg_ctl: postmaster does not shut down
$

Is there any other way to shutdown in this situation?
(Or)
How to know whether database is accessed or not?
(Or)
How to shutdown the postmaster safely from the above
situation?

Regs,
Durai.

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