locking mechanism

hi,

1)If the same PROCLOCK has some already-granted locks and

be waiting for more, how do we know?

I currently use the holding array of PROCLOCK to figure out what lockmodes
a transaction(process) has been granted on LOCK,and if holdings sum comes to
0 that means this PROCLOCK is waiting for its associate LOCK. But how if the
PROCLOCK has already been granted a lock and is waiting for another lock on
the same object( LOCK), how do figure that out?

2)Is tuple level locks the same as row level locks?

Thanks!!

Jenny

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