[Carpet] [CactusMaint] Cactus/2057: add new flesh functions to register/unregister notify callbacks for parameter set operations

[Erik Schnetter]

On Sep 20, 2006, at 09:50:11, tradke at aei.mpg.de wrote:

>> Description:
> This patch implements what was proposed in a discussion on the  
> Cactus developers mailing list (see http://www.cactuscode.org/old/ 
> pipermail/developers/2006-September/005090.html)

I had the impression that there would be no regular expression that  
selects thorns or parameters.  Maybe my memory misleads me, because  
that was the way I tried to argue.

There is no other part of Cactus where thorns or parameters are  
selected via regular expressions.  It would be difficult to find  
regular expressions that select exactly the thorns or parameters that  
one is interested in.  In most cases (e.g., I/O routines), people  
will be interested either in a very specific set of parameters, or in  
all parameters from a given thorn.

I'm afraid that regular expressions make notifications more  
expensive, since each parameter that is steered has to be checked  
against all regular expressions for all listeners.

I would either use a plain mask, as in "interested in only this  
thorn", or "only this parameter from this thorn", or let the listener  
handle make its own decision.  If the listener wants to use a regular  
expression, then the function call overhead is negligible in comparison.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>

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