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.
where is 'HEAP_MARKED_FOR_UPDATE infomask bit' found ? thanks
From: Tom Lane <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED]
Subject: Re: [HACKERS] table-level and row-level locks. Date: Wed, 20 Aug 2003 14:45:23 -0400
Koichi Suzuki <[EMAIL PROTECTED]> 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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