From mihai.bazon at gmail.com  Mon Feb  3 20:37:04 2014
From: mihai.bazon at gmail.com (=?UTF-8?Q?Mihai_C=C4=83lin_Bazon?=)
Date: Mon, 3 Feb 2014 22:37:04 +0200
Subject: Infinite loop when adjusting a time stamp backwards across a DST boundary.
In-Reply-To: <52EFFCAE.7000904@onshored.com>
References: <52EFFCAE.7000904@onshored.com>
Message-ID: <CAOUqiQ3rKupeuReZ3Aggs2b_=NdCztF26CA4iOquOKTgqsQepA@mail.gmail.com>

I wonder if it's related to this:
http://lists.common-lisp.net/pipermail/local-time-devel/2010-December/000217.html

(and if so, sad to see the problem still there after so many years).


On Mon, Feb 3, 2014 at 10:31 PM, Lee Ayres <lee at onshored.com> wrote:

> When adjusting a time-stamp across the DST boundary it is possible to
> throw the function into an infinite loop.
>
> For example, in US Central Time the following never returns:
>
> (adjust-timestamp @2014-03-09T03:00:00.000000-05:00 (:offset :sec -1))
>
> Attached is a patch that bails out before getting caught in the loop.
>



-- 
Mihai Bazon,
http://lisperator.net/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.common-lisp.net/pipermail/local-time-devel/attachments/20140203/86cb3843/attachment.html>

From lee at onshored.com  Mon Feb  3 20:31:42 2014
From: lee at onshored.com (Lee Ayres)
Date: Mon, 03 Feb 2014 14:31:42 -0600
Subject: Infinite loop when adjusting a time stamp backwards across a DST
 boundary.
Message-ID: <52EFFCAE.7000904@onshored.com>

When adjusting a time-stamp across the DST boundary it is possible to 
throw the function into an infinite loop.

For example, in US Central Time the following never returns:

(adjust-timestamp @2014-03-09T03:00:00.000000-05:00 (:offset :sec -1))

Attached is a patch that bails out before getting caught in the loop.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 0001-Add-a-bailout-condition-when-adjusting-time-accross-.patch
Type: text/x-patch
Size: 982 bytes
Desc: not available
URL: <https://mailman.common-lisp.net/pipermail/local-time-devel/attachments/20140203/5028557b/attachment.bin>