Re: lock_timeout GUC patch

Hi,

Tom Lane írta:
> Boszormenyi Zoltan <zb@cybertec.at> writes:
>
>> You expressed stability concerns coming from this patch.
>> Were these concerns because of locks timing out making
>> things fragile or because of general feelings about introducing
>> such a patch at the end of the release cycle? I was thinking
>> about the former, hence this modification.
>>
>
> Indeed, I am *very* concerned about the stability implications of this
> patch.  I just don't believe that arbitrarily restricting which
> processes the GUC applies to will make it any safer.
>
>             regards, tom lane
>

Okay, here is the rewritten lock_timeout GUC patch that
uses setitimer() to set the timeout for lock timeout.

I removed the GUC assignment/validation function.

I left the current statement timeout vs deadlock timeout logic
mostly intact in enable_sig_alarm(), because it's used by
a few places. The only change is that statement_fin_time is
always computed there because the newly introduced function
(enable_sig_alarm_for_lock_timeout()) checks it to see
whether the lock timeout triggers earlier then the deadlock timeout.

As it was discussed before, this is 9.1 material.

Best regards,
Zoltán Böszörményi

--
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----------------------------------
Zoltán Böszörményi
Cybertec Schönig & Schönig GmbH
http://www.postgresql.at/