[gdal-dev] OGRCoordinateTransformation Thread Safety

[Even Rouault]

On mercredi 6 novembre 2019 14:51:28 CET Bryant wrote:
> Further, manual tests suggest that it is in GDAL 2.4.3 -- 20 threads
> performing transformations on the same OGRCoordinateTransformation instance
> and ensuring that the result is within 1e-4 of the correct result.

As most C/C++ libraries, an object is not thread-safe unless it is explicitly 
mentioned it is. This holds for OGRCoordinateTransformation. In GDAL 2.4 with 
PROJ 5.x, you might not notice severe issues in practice (beyond the PROJ 
error state being accessed concurrently). With PROJ 6, you'd likely get 
crashes.

Even

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