Named advisory locks

[rihad <rihad@xxxxxxx>]

Hi, all. I'm looking for a way to lock on an arbitrary string, just how 
MySQL allows doing with GET_LOCK('foo.123') / RELEASE_LOCK('foo.123'). I 
know that at least Postgres 8.3 has pg_advisory_lock() / 
pg_advisory_unlock() but they seem to accept integer values only, and 
we're already using integer values elsewhere.

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