full db locking during dump

I have a situation where I am doing a pg_dump from my database. I want to
make sure that noone is inserting into the tables being dump during the
dump. Does the MVCC architecture make it a moot point or do I need to
disable insert privileges during the dumping window? If so, is there an
easy way (i.e. one liner kind of thing) to do the temporary lock? I was
thinking I might need to write a stored procedure to change the write
privileges for the groups that have write access.

Thanks,

Gregory

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Gregory Stone       |  "Suppose you were an idiot, and suppose you were
guomo ( at ) yahoo.com     |    a member of congress; but I repeat myself."
                    |                                      - Mark Twain
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