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

radoslav hodnicak rh at 4096.sk
Tue Jul 12 13:37:37 CEST 2005

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


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