Re: [PATCH] lock_timeout and common SIGALRM framework

From: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To: Boszormenyi Zoltan <zb(at)cybertec(dot)at>
Cc: Marc Cousin <cousinmarc(at)gmail(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Hans-Juergen Schoenig <hs(at)cybertec(dot)at>, Ants Aasma <ants(at)cybertec(dot)at>, Robert Haas <robertmhaas(at)gmail(dot)com>
Subject: Re: [PATCH] lock_timeout and common SIGALRM framework
Date: 2012-06-19 17:19:04
Message-ID: 1340125490-sup-2305@alvh.no-ip.org
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Excerpts from Boszormenyi Zoltan's message of mar jun 19 12:44:04 -0400 2012:

> OK, all 4 Check* functions are now moved back into proc.c,
> nothing outside of timeout.c touches anything in it. New patches
> are attached.

Yeah, I like this one better, thanks.

It seems to me that the "check" functions are no longer "check" anymore,
right? I mean, they don't check whether the time has expired. It can
be argued that CheckDeadLock is well named, because it does check
whether there is a deadlock before doing anything else; but
CheckStandbyTimeout is no longer a check -- it just sends a signal.
Do we need to rename these functions?

Why are you using the deadlock timeout for authentication? Wouldn't it
make more sense to have a separate TimeoutName, just to keep things
clean?

The "NB:" comment here doesn't seem to be useful anymore:
+ /*****************************************************************************
+ * Init, Destroy and Check functions for different timeouts.
+ *
+ * NB: all Check* functions are run inside a signal handler, so be very wary
+ * about what is done in them or in called routines.
+ *****************************************************************************/

In base_timeouts you don't initialize fin_time for any of the members.
This is probably unimportant but then why initialize start_time?

--
Álvaro Herrera <alvherre(at)commandprompt(dot)com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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