Re: Transaction-scope advisory locks

From: Marko Tiikkaja <marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Szymon Guz <mabewlun(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Transaction-scope advisory locks
Date: 2010-12-14 08:30:27
Message-ID: 4D072B23.8090409@cs.helsinki.fi
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On 2010-12-14 4:23 AM +0200, Tom Lane wrote:
> Marko Tiikkaja<marko(dot)tiikkaja(at)cs(dot)helsinki(dot)fi> writes:
>> On 2010-12-14 1:08 AM +0200, Szymon Guz wrote:
>>> In my opinion changing current behavior is not a good idea. I know some
>>> software that relies on current behavior and this would break it. Maybe add
>>> that as an option, or add another type of advisory lock?
>
>> Oh, I forgot to mention. The patch doesn't change any existing
>> behaviour; the new behaviour can be invoked only by adding a new boolean
>> argument:
>
> Uh, I don't think so. It sure looks like you have changed the user
> lockmethod to be transactional, ie, auto-release on commit/abort.

I was under the impression that passing sessionLock=true to
LockAcquire(), combined with allLocks=false to LockReleaseAll() would be
enough to prevent that from happening. My tests seem to agree with this.

Am I missing something?

Regards,
Marko Tiikkaja

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