are GeometryFactory's build/create methods thread-safe?

[fdarling]

Is GeometryFactory thread safe, in that GeometryFactory::createPolygon() and other object creation methods can be safely called from multiple threads at the same time?

If calling GeometryFactory::setPrecisionModel() is not thread-safe, that is acceptable since I wouldn't be doing that during the multi-threaded tasks.

In reading the source code, it seems that the factory doesn't really do anything special when it comes to memory allocation, but rather it is a centralized location for settings. In my experimentation, it seems unnecessary to have multiple factories (one for each thread).

Let me know if I am missing something!