[Seaside] Long running delays (was Re: [ShoreComponents] WebTree, SVG demo and dynamic files)

[radoslav hodnicak]

On Tue, 12 Jul 2005, Philippe Marschall wrote:

> 2005/7/11, Torsten Bergmann <astares at gmx.de>:
>> Adrian wrote:
>>> I don't know if this is already planned, Jan, Pavel? Else I can setup
>>> a demo image and will try to regularly update that when new versions
>>> exist.
>>
>> Why should you try to update when Smalltalk is able to do the update
>> job for you. Just use the scheduler implementation from
>> http://squeak.saltypickle.com/Scheduler/
>
> I have a technical question about that. As far as I can see, this is
> implemented with Delays. We experienced problems with long delays on
> long running images. E.g a delay of one day running over several
> months ended messed up.
>
> Do you know anything about this or have you done anything to prevent this?

Can you describe what "messed up" means?

I remember having problem in visualworks with long running delays (note to 
Dave - delays that run repeatedly for a long time, not delays that wait a 
long time) which was related to a race condition in Semaphore>>critical: 
implementation. As far as I know the problem is still there (as of VW 
7.3.1). Are you using VW? If yes look at this thread
http://groups-beta.google.com/group/comp.lang.smalltalk/browse_thread/thread/d8e5d140b85af9c0/0dfc652ef3bc161b

rado