Re: [naviserver-devel] ns_atstartup and order of execution?

[Vlad S. <vl...@cr...>]

I have no objections

Zoran Vasiljevic wrote:
> Hi !
> 
> We have a pretty elaborate (and sometimes confusing) mechanism
> for running various atXXX scripts.
> 
> So, if I would like to:
> 
>   ns_atstartup X
>   ns_atstartup Y
>   ns_atstartup Z
> 
> then the server will execute:
> 
>   Z
>   Y
>   X
> 
> i.e. in the *reverse* order. This is because all of those
> are just entered in a single-linked list and the head of
> the list points always to the *last* registered item.
> 
> This is suboptimal.
> 
> In many real world scenarios, I will like to use the ns_atstartup
> to schedule couple of scripts to do various initialization things.
> It is often so that Y will depend on X and Z on Y to be successfull.
> At the moment, I'm (mis)using the ns_job with a single thread and
> post the jobs there, because it will then exectue them in FIFO fashion
> (which is what I need). BUT: this is of course not optimal as it runs
> parallely with the server startup and I have to be carefull to  accomodate
> for that.
> 
> So, I'm all for reversing the logic of script execution i.e. doing the
> more natural way of runing them in FIFO fashion (now we have LIFO).
> But, I'm afraid of the potential compatibility problems. What I would
> like to see is if any of you would have objections to reversing the
> logic, and if yes, ideas how we could make this compatible?
> One idea would be:
> 
>    ns_atXXX ?-tail? $theScript
> 
> I'd rather go after FIFO list walk then adding yet-another-option,
> but I'm open to suggestions...
> 
> Cheers
> Zoran
> 
> 
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-- 
Vlad Seryakov
571 262-8608 office
vl...@cr...
http://www.crystalballinc.com/vlad/