Parallel MPI boundary

#define     GFS_BOUNDARY_MPI_CLASS(klass)

#define     GFS_BOUNDARY_MPI(obj)

#define     GFS_IS_BOUNDARY_MPI(obj)

struct GfsBoundaryMpiClass;

struct GfsBoundaryMpi {
  /*< private >*/
  GfsBoundary parent;

  MPI_Comm comm;
  gint process, id;

  MPI_Request request[2];
  guint nrequest;

  GArray * sndbuf, * rcvbuf;
  unsigned int sndcount, rcvcount;
};

GfsBoundaryMpi* gfs_boundary_mpi_new        (GfsBoundaryMpiClass *klass,
                                             GfsBox *box,
                                             FttDirection d,
                                             gint process,
                                             gint id);

GfsBoundaryMpiClass* gfs_boundary_mpi_class (void);