Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Fri, 21 Jun 2013 20:12:46 +0200

Am Freitag, 21. Juni 2013, 17:24:29 schrieb Andrew Johnson:
> On 2013-06-21 Benjamin Franksen wrote:
> > On Friday, June 21, 2013 11:18:07 Benjamin Franksen wrote:
> > > The errlog facility provides errlogAddListener, and
> > > errlogRemoveListener. Unfortunately, the latter is broken, as there is
> > > no way to specify the listener's private data. So if I have two
> > > listeners which differ only in their private data (such as when using
> > > two instances of feller), then I can only remove them all at once, not
> > > each one separately.
> [...]
> > > The attached patch file rectifies that by adding an
> > > errlogRemoveSingleListener function to the API that allows to remove
> > > single instances.
>
> Thanks, I will consider this for the 3.15 branch.

Cool. However, for 3.15 I propose to change the existing errlogRemoveListener,
instead of adding a new function; I was speculating on the patch being
accepted for 3.14.12.4, which is why I added a new function.

> > In the meantime, I wonder how to proceed with the feller module.
>
> ...
>
> > Better ideas would be much appreciated.
>
> You could just register one listener and keep your own list of clients
> which that listener traverses when it gets called.  Now you can delete
> specific entries at leisure because you own the list.

My colleague Götz suggested the same and so this is what I did. Not much of a
problem since I already had such a list. (I needed it so that when the user
gives a file name for which a feller already exists, she gets back the
existing feller, not a new one; fellerCreate will output a warning in this
case, since this is typically not what you want).

It's all implemented in the newly released feller-0.3.

Cheers and thanks to everyone for the valuable feedback.
--
Ben Franksen
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System