Question about accessing global data from a line function

[Perf Tech]

Dear expert,

   I am trying to access perl global variable ($data in this case) from
within a inline C function, but the "data" variable I used is not defined.
Any idea how to do it?

Thanks
Jin


$data = "this is a test";
test();

use Inline C => <<'END_OF_C_CODE';

void test() {
printf("here: %s\n", SvPV(data, PL_na));
}

END_OF_C_CODE