tablelevel and rowlevel locks

I am working on a project that involves displaying locking information about
each lock taken, whether it be a row level or  table leve llock.
When dealing with struct LOCK (src/include/storage) i have noticed that
postgreSQL creates a single LOCK  struct for each table in the  db. Like if
i acquire 2 seperate row level locks on 2 seperate rows, both these locks
are represented in the same struct LOCK datastructure . And if i acquire a
table level lock on this table, then all 3 locks information( 2 row level
locks and 1 table level lock) is recorded in the same LOCK datastructure. I
would think that there should be 3 different LOCK datastructres created in
postgreSQL for the above example.
IS there are reason why only one LOCK datastructures is created in such a
case?
for the purposes of my project i need to seperate out these 3 locks and
present them as 3 distinct locked objects. i was using the LockData(defined
in src/include/storage/lock.h ) datastructures for this, but if all 3 locks
are put into the same LOCK struct even in LOCKDATA then can someone help me
as to how else i can accomplish what i intent on doing?
thank you very much
Jenny

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