Log Message:
-----------
Add code to catch deadlocking against self (e.g. opening 6 cursors when you
belong to a queue with active threshold 5). 

This could be used to handle the case of 1 statement with a cost higher than
the queue cost threshold (currently allow overcommit if it is the only active 
statement).

Modified Files:
--------------
    bizgres/postgresql/src/backend/storage/lmgr:
        proc.c (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/bizgres/bizgres/postgresql/src/backend/storage/lmgr/proc.c.diff?r1=1.2&r2=1.3)

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