[Rd] How to safely using OpenMP pragma inside a .C() function?

[pawelm]

Simon,

This is very useful example and explanation. Thank you very, very much. The
icing on the cake would be some guidelines how to set up the number of
threads. R source code uses global variable R_num_math_threads. Can we use
that? Or each openmp-enabled R package would have it's own mechanism?

Related question: I was trying to find out if R_num_math_threads could be
set up by a user and I found this line in the ./src/main/names.c file:

{"setNumMathThreads", do_setnumthreads, 0, 11, 1, {PP_FUNCALL, PREC_FN, 0}}

It suppose to be a function name but all I get in R command line is: 

Error: could not find function "setNumMathThreads"

Any thoughts?

Thank you
Regards

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