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No-no. libraw (.a, .so) is

No-no.

libraw (.a, .so) is compiled with -DLIBRAW_NOTHREADS, so some internal decoder buffers are static. This is faster, but this library is not reentrant. You may use it in multithreaded environment, but not for decoding several files in parallel

libraw_r is compiled with -pthread and without LIBRAW_NOTHREADS define, so all I/O calls are made via thread-safe version and decoder storage is allocated within LibRaw class. So, extra locks, extra indirection for storage, but thread-safe.

Not reentrant version is several percent faster.

-- Alex Tutubalin