spmd_split_comm.F

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!||====================================================================
!||    spmd_split_comm       ../engine/source/mpi/init/spmd_split_comm.F
!||--- called by ------------------------------------------------------
!||    mpp_init              ../engine/source/mpi/interfaces/spmd_i7tool.F
!||--- calls      -----------------------------------------------------
!||--- uses       -----------------------------------------------------
!||    spmd_comm_world_mod   ../engine/source/mpi/spmd_comm_world.F90
!||====================================================================
      SUBROUTINE spmd_split_comm(ISACTIVE, COMM_LOCAL)
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
        USE spmd_comm_world_mod, ONLY : spmd_comm_world
#include      "implicit_f.inc"
C-----------------------------------------------------------------
C   M e s s a g e   P a s s i n g
C-----------------------------------------------
#include "spmd.inc"
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
#include      "task_c.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER ISACTIVE, COMM_LOCAL
C-----------------------------------------------
C   L o c a l  V a r i a b l e s
C-----------------------------------------------
#ifdef MPI
      INTEGER IVAL, IERROR
C-----------------------------------------------
C   S o u r c e  L i n e s
C-----------------------------------------------
C
      ival=isactive
      IF(isactive > 0) THEN
        ival = 1
      ELSE
        ival = mpi_undefined ! if not concerned by this communication set to undefined communicator
      END IF  
      CALL mpi_comm_split(spmd_comm_world, ival, ispmd+1, comm_local, ierror)
C     IF(IVAL /=0)  CALL MPI_Comm_Free(contcomm, ierror) ! only where new communicator is created (ie not MPI_UNDEFINED)
 
#endif
      RETURN
      END