mp_bcast_d Subroutine

      SUBROUTINE mp_bcast_d (msg, source, gid)
      !! Broadcasts a datum to all processes.
      !!
      !! MPI mapping
      !! mpi_bcast

         REAL(kind=real_8)                                :: msg
         !! Datum to broadcast
         INTEGER                                  :: source, gid
         !! Processes which broadcasts
         !! Message passing environment identifier

         CHARACTER(LEN=*), PARAMETER :: routineN = 'mp_bcast_d'

         INTEGER                                  :: handle, ierr, msglen

         ierr = 0
         CALL timeset(routineN, handle)

         msglen = 1
#if defined(__parallel)
         CALL mpi_bcast(msg, msglen, MPI_DOUBLE_PRECISION, source, gid, ierr)
         IF (ierr /= 0) CALL mp_stop(ierr, "mpi_bcast @ "//routineN)
         CALL add_perf(perf_id=2, msg_size=msglen*real_8_size)
#else
         MARK_USED(msg)
         MARK_USED(source)
         MARK_USED(gid)
#endif
         CALL timestop(handle)
      END SUBROUTINE mp_bcast_d