From: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers(at)postgresql(dot)org, Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>, Szymon Guz <mabewlun(at)gmail(dot)com> |
Subject: | Re: Transaction-scope advisory locks |
Date: | 2010-12-14 15:06:31 |
Message-ID: | AANLkTi=xRvU1S_Poj2Dnz_pjs8Yr8mso5y=Caajm6+n4@mail.gmail.com |
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Lists: | pgsql-hackers |
On Tue, Dec 14, 2010 at 9:51 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Merlin Moncure <mmoncure(at)gmail(dot)com> writes:
>> Not that I'm necessarily against the proposal, but what does this do
>> that can't already be done by locking a table or a table's row?
>
> I agree with Andres' point about this: sometimes it'd be more convenient
> for an advisory lock to be released automatically at transaction end.
> If you have a mix of clients that want that behavior with others that
> want a persistent hold on the same locks, you can't do it with regular
> locks.
right, plus 4:
automatic lock release on error. right now if I'm grabbing
in-transaction lock inside a function, I have to put in sub
transaction handler to guarantee release if anything non trivial
happens mid lock.
merlin
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