The GNU Fortran Compiler: _gfortran_caf_sync_all

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#### 8.2.15 `_gfortran_caf_sync_all` — All-image barrier

Description:

  Synchronization of all images in the current team; the program only continues on a given image after this function has been called on all images of the current team. Additionally, it ensures that all pending data transfers of previous segment have completed.

Syntax:

  `void _gfortran_caf_sync_all (int *stat, char *errmsg, int errmsg_len)`

Arguments:

  stat | intent(out) Stores the status STAT= and may be NULL.
  errmsg | intent(out) When an error occurs, this will be set to an error message; may be NULL
  errmsg_len | the buffer size of errmsg.