Good morning!
The descriptions of memory protection all assume that one
is calling a C-function directly from R. I'm not sure if my
understanding of calling a C-function from another C-function
is correct:
Suppose there are two functions
SEXP bar(SEXP y) {
SEXP b;
PROTECT(b =
Torsten,
Of course, R itself is a C program so the principles apply to interpreted
calls too, with your code in bar returning control to do_dotcall in your
first example.
There can be no R memory allocation between returning from bar and
assigning to a in foo, and it is memory allocation (and
