The GNU Fortran Compiler: _gfortran_caf_this_image

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#### 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 non-negative 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.