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subroutine sayhello(comm) bind(C)
use mpi_f08
implicit none
type(MPI_Comm), intent(in) :: comm
integer :: rank, size, nlen
character (len=MPI_MAX_PROCESSOR_NAME) :: name
if (comm == MPI_COMM_NULL) then
print*, "You passed MPI_COMM_NULL !!!"
return
end if
call MPI_Comm_rank(comm, rank)
call MPI_Comm_size(comm, size)
call MPI_Get_processor_name(name, nlen)
print '(2A,I2,A,I2,3A)', &
'Hello, World!', &
' I am process ', rank, &
' of ', size, &
' on ', name(1:nlen), '.'
end subroutine sayhello
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