MccGenericNetworkServer: fix client session thread pool behavior in

destructor

mcc/mcc_netserver.h

@@ -188,7 +188,7 @@ public:
         std::stringstream st;
         st << std::this_thread::get_id();
 
-        logInfo(std::format("Create generic network server instance (thread ID = {})", st.str()));
+        logInfo(std::format("Create MccGenericNetworkServer class instance (thread ID = {})", st.str()));
     }
 
     // MccNetworkServer(asio::io_context& ctx, const handle_message_func_t& func, LoggerT logger = MccNullLogger{})
@@ -208,6 +208,10 @@ public:
         logInfo(std::format("Delete generic network server instance (thread ID = {}) ...", st.str()));
 
         stopListening();
+
+        _sessionThreadPool.stop();
+        _sessionThreadPool.join();
+
         disconnectClients();
     }
 
@@ -585,8 +589,15 @@ public:
         _stopSignal.async_wait([this](std::error_code, int signo) {
             logInfo(std::format("Stop signal was received (signo = {})", signo));
 
-            stopListening();
-            disconnectClients();
+            // _handleMessageFunc(MCC_COMMPROTO_KEYWORD_STOP_STR);
+            // std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+            // stopListening();
+
+            // _sessionThreadPool.stop();
+            // _sessionThreadPool.join();
+
+            // disconnectClients();
 
             _asioContext.stop();
         });
@@ -913,10 +924,21 @@ class MccGenericMountNetworkServer : public MccGenericNetworkServer<LoggerT>
 public:
     using typename base_t::handle_message_func_result_t;
 
+    using base_t::logDebug;
+    using base_t::logError;
+    using base_t::logInfo;
+    using base_t::logTrace;
+    using base_t::logWarn;
+
     template <mcc_generic_mount_c MountT, typename... LoggerCtorArgsTs>
     MccGenericMountNetworkServer(asio::io_context& ctx, MountT& mount, LoggerCtorArgsTs&&... log_args)
         : base_t(ctx, {}, std::forward<LoggerCtorArgsTs>(log_args)...)
     {
+        std::stringstream st;
+        st << std::this_thread::get_id();
+
+        logInfo(std::format("Create MccGenericMountNetworkServer class instance (thread ID = {})", st.str()));
+
         // to avoid possible compiler optimization (one needs to catch 'mount' strictly by reference)
         auto* mount_ptr = &mount;
 
@@ -939,15 +961,27 @@ public:
 
             return output_msg.template byteRepr<typename base_t::handle_message_func_result_t>();
         };
+
+        // special functor (used in the destructor)
+        _stopMountFunc = [mount_ptr]() { mount_ptr->stopMount(); };
     }
 
-    virtual ~MccGenericMountNetworkServer() {}
+    virtual ~MccGenericMountNetworkServer()
+    {
+        std::stringstream st;
+        st << std::this_thread::get_id();
+
+        _stopMountFunc();
+
+        logInfo(std::format("Delete MccGenericMountNetworkServer class instance (thread ID = {})", st.str()));
+    }
 
 protected:
     MccCoordinateSerializer::SerializedCoordFormat _coordFormat{
         MccCoordinateSerializer::SerializedCoordFormat::CFMT_SGM};
     MccCoordinateSerializer::SexagesimalCoordPrec _coordPrec{2, 1};
 
+    std::function<void()> _stopMountFunc{};
 
     template <typename RESULT_MSG_T, typename INPUT_MSG_T, mcc_generic_mount_c MountT>
     RESULT_MSG_T handleMessage(const INPUT_MSG_T& input_msg, MountT* mount_ptr)