LOCK.tag(figuring out granularity of lock)-- - Mailing list pgsql-general

following is taken from postgresql-7.3.2/src/backend/storage/lmgr/readme:

"If we are setting a table level lock
    both the blockId and tupleId (in an item pointer this is called
    the position) are set to invalid, if it is a page level lock the
    blockId is valid, while the tupleId is still invalid.  Finally if
    this is a tuple level lock (we currently never do this) then both
    the blockId and tupleId are set to valid specifications.  "


is blockId same as tag.objId.blkno?  what field in LOCK.tag is tupleId?
thanks
jenny

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