The GNU Fortran Compiler: _gfortran_caf_atomic_ref

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#### 8.2.29 `_gfortran_caf_atomic_ref` — Atomic variable reference

Description:

  Reference atomically a value of a kind-4 integer or logical variable.

Syntax:

  `void _gfortran_caf_atomic_ref (caf_token_t token, size_t offset, int image_index, void *value, int *stat, int type, int kind)`

Arguments:

  token | intent(in) An opaque pointer identifying the coarray.
  offset | intent(in) By which amount of bytes the actual data is shifted compared to the base address of the coarray.
  image_index | intent(in) The ID of the remote image; must be a positive number; zero indicates the current image when used noncoindexed.
  value | intent(out) The variable assigned the atomically referenced variable.
  stat | intent(out) Stores the status STAT= and may be NULL.
  type | the data type, i.e. `BT_INTEGER` (1) or `BT_LOGICAL` (2).
  kind | The kind value (only 4; always `int`)