8.2.3 _gfortran_caf_this_image — Querying the image number

Description:
This function returns the current image number, which is a positive number.
Syntax:
int _gfortran_caf_this_image (int distance)
Arguments:
distance As specified for the this_image intrinsic in TS18508. Shall be a nonnegative number.
NOTES
If the Fortran intrinsic this_image is invoked without an argument, which is the only permitted form in Fortran 2008, GCC passes 0 as first argument.

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