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TIFF and LibTiff Mailing List Archive
July 2017

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2017.07.04 11:04 "A bug in libtiff error/warning handling", by Paavo Helde
2017.07.04 11:30 "Re: A bug in libtiff error/warning handling", by Even Rouault
2017.07.04 12:20 "Re: A bug in libtiff error/warning handling", by <rleigh@codelibre.net>
2017.07.04 12:55 "Re: A bug in libtiff error/warning handling", by Even Rouault
2017.07.04 12:30 "Re: A bug in libtiff error/warning handling", by Paavo Helde
2017.07.04 18:38 "Re: A bug in libtiff error/warning handling", by Bob Friesenhahn
2017.07.04 19:31 "Re: A bug in libtiff error/warning handling", by Paavo Helde
2017.07.05 12:12 "Re: A bug in libtiff error/warning handling", by Edward Lam
2017.07.05 12:40 "Re: A bug in libtiff error/warning handling", by Olivier Paquet
2017.07.05 13:41 "Re: A bug in libtiff error/warning handling", by Bob Friesenhahn
2017.07.05 13:57 "Re: A bug in libtiff error/warning handling", by Paavo Helde
2017.07.05 15:02 "Re: A bug in libtiff error/warning handling", by Olivier Paquet
2017.07.05 18:51 "Re: A bug in libtiff error/warning handling", by Paavo Helde
2017.07.05 19:36 "Re: A bug in libtiff error/warning handling", by Olivier Paquet

2017.07.04 18:38 "Re: A bug in libtiff error/warning handling", by Bob Friesenhahn

On Tue, 4 Jul 2017, Paavo Helde wrote:
>
> A proper fix would be to deprecate the global handler variables in libtiff 
> (which are not thread-safe anyway and will conflict between different 
> libraries anyway) and store the handler function pointer in the TIFF 
> structure instead, next to tif_clientdata. This would make the handler 
> specific to a single client and then I would indeed agree there would be no 
> need to call more than one handler at any time. I think it has been agreed 
> earlier that this is something what is needed, but to get this fixed is 
> obviously much more work.

This would not work for the common case of reporting an error when 
there is no TIFF handle.  There would need to be additional parameters 
added for the functions which open a a TIFF.

If OS thread APIs can be used, then there is the option to use thread 
specific data without any API change, but a possible added library 
dependency.

Bob
-- 
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/