!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!       NASA/GSFC, Data Assimilation Office, Code 910.3, GEOS/DAS      !
!BOP -------------------------------------------------------------------
!
! !ROUTINE: mpi_barrier -
!
! !DESCRIPTION:
!
! !INTERFACE:

    subroutine mpi_barrier(comm,ierror)
      use m_mpi0,only : mpi0_initialized
      implicit none
      integer,intent(in)  :: comm
      integer,intent(out) :: ierror

! !REVISION HISTORY:
! 	29Sep99	- Jing Guo <guo@dao.gsfc.nasa.gov>
!		- initial prototype/prolog/code
!EOP ___________________________________________________________________

  character(len=*),parameter :: myname='mpi_barrier'

  if(.not.mpi0_initialized) call mpi_init(ierror)

  ierror=0
end subroutine mpi_barrier