NI FPGA Interface C API multithreading safe?

Hello,

I am using the FPGA interface C API to communicate with the labview software running on my NI FPGA. Some calls take quite some time to execute, e.g. reading from a FIFO when setting a long time-out. Up till now, I have been assuming that the interface was not multithreading safe. This has now become bothersome given the time-out issue described above. Simply trying does not feel right, it may take quite some time to create a 'collison'.

Is the FPGA interface C API multithreading safe? Or, more specifically, can FIFO reading-related functions be called in parellel with writing/reading of variables on the FPGA?

Thanks.