if (src_buff_ != nullptr) {
simcall_comm_send(sender_, mailbox_->get_impl(), remains_, rate_, src_buff_, src_buff_size_, match_fun_,
copy_data_function_, user_data_, timeout);
if (src_buff_ != nullptr) {
simcall_comm_send(sender_, mailbox_->get_impl(), remains_, rate_, src_buff_, src_buff_size_, match_fun_,
copy_data_function_, user_data_, timeout);