p_mpi_alltoall.F

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!                   *************************
                    SUBROUTINE p_mpi_alltoall
!                   *************************
!
     &(send_buffer,nsend,send_datyp,recv_buffer,nrecv,recv_datyp,
     & ierr)
!
!***********************************************************************
! PARALLEL   V6P2                                   21/08/2010
!***********************************************************************
!
!brief    CALLS FUNCTION MPI_ALLTOALL.
!
!history  C. DENIS (SINETICS)
!+        27/10/2009
!+        V6P0
!+
!
!history  N.DURAND (HRW), S.E.BOURBAN (HRW)
!+        13/07/2010
!+        V6P0
!+   Translation of French comments within the FORTRAN sources into
!+   English comments
!
!history  N.DURAND (HRW), S.E.BOURBAN (HRW)
!+        21/08/2010
!+        V6P0
!+   Creation of DOXYGEN tags for automated documentation and
!+   cross-referencing of the FORTRAN sources
!
!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!| SEND_BUFFER   |-->| SEND BUFFER
!| NSEND         |-->| SPECIFIES THE NUMBER OF ELEMENTS TO SEND TO EACH
!|               |   | PROCESSOR
!| SEND_DATYP    |-->| DATA TYPE OF SEND BUFFER ELEMENTS
!| RECV_BUFFER   |<--| RECEIVE BUFFER
!| NRECV         |-->| SPECIFIES THE MAXIMUM NUMBER OF ELEMENTS THAT
!|               |   | CAN BE RECEIVED FROM EACH PROCESSOR
!| RECV_DATYP    |-->| DATA TYPE OF RECEIVE BUFFER ELEMENTS
!| IERR          |<--| ERROR VALUE
!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!
      USE declarations_parallel
      USE declarations_special
      IMPLICIT NONE
!
!+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
!
      INTEGER, INTENT(IN)  :: SEND_BUFFER(*),NSEND,SEND_DATYP,NRECV
      INTEGER, INTENT(IN)  :: RECV_DATYP
      INTEGER, INTENT(OUT) :: RECV_BUFFER(*),IERR
!
!+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
!
      recv_buffer(1) = 0
      ierr = 0
#if defined HAVE_MPI
      CALL mpi_alltoall(send_buffer,nsend,send_datyp,
     &                  recv_buffer,nrecv,recv_datyp,
     &                  comm,ierr)
!
      IF(ierr.NE.0) THEN
        WRITE(lu,*) 'P_MPI_ALLTOALL:'
        WRITE(lu,*) 'MPI ERROR ',ierr
        CALL plante(1)
        stop
      ENDIF
      RETURN
#else
      WRITE(lu,*) 'CALL OF P_MPI_ALLTOALL VOID VERSION'
#endif
!
!-----------------------------------------------------------------------
!
      END