*ierr = MPI_Comm_create(simgrid::smpi::Comm::f2c(*comm),simgrid::smpi::Group::f2c(*group), &tmp);
if(*ierr == MPI_SUCCESS) {
*newcomm = tmp->add_f();
*ierr = MPI_Comm_create(simgrid::smpi::Comm::f2c(*comm),simgrid::smpi::Group::f2c(*group), &tmp);
if(*ierr == MPI_SUCCESS) {
*newcomm = tmp->add_f();