p_isum.F

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!                   ***********************
                    INTEGER FUNCTION p_isum
!                   ***********************
!
     &(mypart)
!
!***********************************************************************
! PARALLEL   V6P1                                   21/08/2010
!***********************************************************************
!
!brief    SUM OF VALUES FROM ALL THE PROCESSORS.
!
!history  RAINER JOHANNI (SGI MUNICH)
!+        **/10/1999
!+
!+   ADAPTED FOR MPI
!
!history  J.A. JANKOWSKI (BAW KARLSRUHE)
!+        28/12/1999
!+
!+   RELEASE 5.0 MODIFIED
!
!history  J-M HERVOUET (LNHE)
!+        10/06/2005
!+        V5P9
!+
!
!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
!
!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!| MYPART         |-->| SEND BUFFER.
!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!
      USE declarations_parallel
      USE declarations_special
      IMPLICIT NONE
!
!+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
!
      INTEGER, INTENT(IN) :: MYPART
!
!+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
!
#if defined HAVE_MPI
      INTEGER IER
!
!-----------------------------------------------------------------------
      CALL mpi_allreduce(mypart,p_isum,1,mpi_integer,mpi_sum,
     &                   comm,ier)
!
      IF(ier.NE.0) THEN
        WRITE(lu,*) 'P_ISUM: ERROR IN MPI_ALLREDUCE'
        WRITE (lu,*) 'MPI ERROR ',ier
        CALL plante(1)
        stop
      ENDIF
      RETURN
#else
      WRITE(lu,*) 'CALL OF P_ISUM IN ITS VOID VERSION'
!
      p_isum=mypart
#endif
!
!-----------------------------------------------------------------------
!
      END