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September 2006
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2006.09.22 16:49 "Re: libjpeg", by Philip Watkinson
Bob, > The problem is with the dependence on setjmp/longjmp for error > recovery. These APIs were never designed with multi-thread in mind > and are not thread safe on many (most?) platforms. Unless > specifically documented to be thread safe, one must assume not thread > safe for these APIs. Other than this, I think that libjpeg is pretty > thread safe. Libpng has the same problem as libjpeg. I just did some searching on the Internet and found the following from March 2000: > libjpeg is thread-safe as long as (a) you don't have multiple threads > operating concurrently on the same jpeg object, and (b) your underlying > C library (particularly malloc/free) is thread-safe. You can have > multiple jpeg objects being manipulated concurrently by different > threads. > > regards, tom lane > organizer, Independent JPEG Group Philip