Re: Issue with GM through JNI

Hi Bob,

The DSETJMP_IS_THREAD_SAFE build flag solved the performance problem with
libpng. However, we found out libjpeg also suffers from the same slowness
caused by locking.

We dug a little and found this line in jpeg.c:
entry=SetMagickInfo("JPEG");
entry->thread_support=False; /* libjpeg is not thread safe */

I did some research and according to here
<https://www.imagemagick.org/discourse-server/viewtopic.php?t=25495>, it
seems like libjpeg is thread safe as long as only one thread works on one
jpeg object. In that case, I am thinking if I can change the thread_support
to True to allow GM to output multiple JPEGs concurrently.

Or is there any other caveats?

Thanks so much for the help!
Tianyu

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