Geos - multithreading and error handling

Is geos safe for multi-threading?

What is the approach when using the C-API for error handling?  I see 
that you can install an error handler and a notice handler.  However, 
those functions are global.  So in a multi-threaded app its easy to see 
how different threads could trigger these functions in an unexpected 
order causing the wrong error message to be returned to each thread.

How have people dealt with this?  Using thread-local storage?  Or 
serializing there calls into GEOS?  Or some other mechanism?

Charlie

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