-----Original Message-----
From: Bob Friesenhahn [mailto:[email protected]]
Sent: 18. december 2010 03:35
> In my experience, both Windows and POSIX provide thread specific data
> ("TSD") APIs which are much more efficient than using mutexes for
> doing things like accessing redundant caches without API
> modifications. The way this works is that your pointer is stored in a
> thread-specific area so that it is found efficiently with one array
> indexing operation. TSD could be used to support the single-pixel
> cache you mention.
Hi all.
The application I am working on just disables the cache. Locking is extremely
counterproductive, since we tile the image and put each thread to work in
parallel. I would think this is a very common way to operate, so I never
really understood the reason why locking was even an option.
In my opinion, TLD (thread local data) is over engineering and not
generally available. Why not just reserve a small buffer on the stack and
pass it to a thread-safe version of the conversion routine?
Something along these lines:
cmsTransformBuf buf;
cmsDoTransformTS(src, dst, pix_count, &buf);
The single-pixel would simply be put in the buffer.
Just my two cents, but it looks simple, portable, easy to use and solves
all problems I had with the current interface.
Kind regards,
Esben H-R Myosotis
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