Thread safety with errno

[Guy Morand]

Hi libmodus mailing list!

I think I have found my answer but I'm still asking to double check.

From https://github.com/stephane/libmodbus/issues/246, a ``modbus_t``
is not thread safe and should be only access by a single thread.

My worries is about errno. By checking the code it seems that it is
using ``<errno.h>`` from the standard C library. At least under Linux,
from ``man 3 errno``:
"errno is thread-local; setting it in one thread does not affect its
value in any other thread."

So I should be safe as long as I access ``modbus_t`` from the same
thread. Could you confirm?

Thanks for your enlightenment!

Best regards,

Guy Morand

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