for (auto const& it : rma_wins_) {
if(it->rank()==this->rank()){//is it ours (for MPI_COMM_WORLD)?
int finished = it->finish_comms();
for (auto const& it : rma_wins_) {
if(it->rank()==this->rank()){//is it ours (for MPI_COMM_WORLD)?
int finished = it->finish_comms();