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Re: Transaction-scope advisory locks

From: Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Itagaki Takahiro <itagaki(dot)takahiro(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Transaction-scope advisory locks
Date: 2011-01-28 08:12:43
Message-ID: 4D427A7B.8080100@cs.helsinki.fi (view raw or flat)
Thread:
Lists: pgsql-hackers
On 1/23/2011 4:24 AM, Robert Haas wrote:
> On Thu, Jan 20, 2011 at 5:22 AM, Marko Tiikkaja
> <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>  wrote:
>> On 2011-01-17 9:28 AM +0200, Itagaki Takahiro wrote:
>>> == Coding ==
>>> I expect documentation will come soon.
>>
>> I'm sorry about this, I have been occupied with other stuff.  I'm going to
>> work on this tonight.
>
> Any update on this?

Again, my apologies for the delay :-(  Things haven't been going as 
planned during the last few weeks.

Here's an updated patch with proposed doc changes.  I still didn't 
address the issue with pg_advisory_unlock_all() releasing transaction 
scoped locks, but I'm going to.  Another issue I found while testing the 
behaviour here:
http://archives.postgresql.org/pgsql-hackers/2011-01/msg01939.php
is that if a session holds both a transaction level and a session level 
lock on the same resource, only one of them will appear in pg_locks.  Is 
that going to be a problem from the user's perspective?  Could it be an 
indication of a well-hidden bug?  Based on my tests it seems to work, 
but I'm not at all confident with the code.


Regards,
Marko Tiikkaja

Attachment: advisory3.patch
Description: text/plain (32.4 KB)

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