if table and page are locked in src/backend/storage/lmgr/lmgr.c by 
LockRelation() and LockPage respectively, in which file and by which 
function is a row locked?
thanks
Jenny


>From: "Jenny -" <nat_lazy@hotmail.com>
>To: pgsql-hackers@postgresql.org
>Subject: Re: [HACKERS] table-level and row-level locks.
>Date: Sun, 24 Aug 2003 11:30:41 -0700
>
>>A row lock is represented by storing the locking transaction's ID in
>>xmax and setting the HEAP_MARKED_FOR_UPDATE infomask bit.
>
>Where is 'xmax' found? is it at code level or on disk?
>thanks
>Jenny
>
>
>>From: Tom Lane <tgl@sss.pgh.pa.us>
>>To: suzukikui@nttdata.co.jp
>>CC: pgsql-hackers@postgresql.org
>>Subject: Re: [HACKERS] table-level and row-level locks. Date: Wed, 20 Aug 
>>2003 14:45:23 -0400
>>
>>Koichi Suzuki <suzukikui@nttdata.co.jp> writes:
>> > I need to know where such "lock marks" are stored in the source level.
>>
>>A row lock is represented by storing the locking transaction's ID in
>>xmax and setting the HEAP_MARKED_FOR_UPDATE infomask bit.  The bit is
>>needed to distinguish this from the case where the transaction is
>>deleting the tuple.
>>
>>			regards, tom lane
>>
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Tue, 26 Aug 2003 10:48:18 -0700
"Jenny -" <nat_lazy@hotmail.com>
Re: table-level and row-level locks.