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are the VISA functions threadsafe?

I developed an application using 4 different threads for serial communication with 4 virtual COM ports (the same reentrant VI is called in every thread).
I discovered that if my applications hangs for some seconds executing one of the VISA functions (before returning with timeout error) I have some problems also in the other threads.

I wasn't able to fiund out if the VISA functions are threadsafe or not.
Could someone give me an answer?

Thanks in advance

Vix
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In claris non fit interpretatio

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Using LV from 7
Using LW/CVI from 6.0
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