scheduler: avoid overflow causing 100% cpu usage

src/dht_proxy_server.cpp

@@ -124,6 +124,9 @@ DhtProxyServer::DhtProxyServer(std::shared_ptr<DhtRunner> dht, in_port_t port ,
         while (service_->is_up()  and not stopListeners) {
             std::unique_lock<std::mutex> lock(schedulerLock_);
             auto next = scheduler_.run();
+            if (next == time_point::max())
+                schedulerCv_.wait(lock);
+            else
                 schedulerCv_.wait_until(lock, next);
         }
     });