[Rd] Thread-safe R functions

[Jiefei Wang]

Hi,

I am curious about whether there exist thread-safe functions in
`Rinternals.h`.  I know that R is single-threaded designed, but for the
simple and straightforward functions like `DATAPTR` and `INTEGER_GET_REGION`,
are these functions safe to call in a multi-thread environment?

Best,
Jiefei

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