fix(app): the log written to the end of the closing, each step of it with its time; the Discord thread idle outside the driver mode

The log service stopped with applicationQuitOrder, so whatever was logged while the simulator closed was lost; it now runs until StopLogService() and writes out what came before. The closing logs each of its steps with the time since it began, to tell where a closing that hangs stops. Outside the driver mode the Discord thread spun a core in its loop, it now sleeps a second between the checks.

application/application.cpp

@@ -270,7 +270,11 @@ void eu07_application::DiscordRPCService()
 		}
 
 		if (currentMode != mode::driver)
+		{
+			// the editor and the other modes: nothing to tell, without spinning a core on it
+			std::this_thread::sleep_for(std::chrono::milliseconds(1000));
 			continue;
+		}
 
 		// Discord RPC updater
 		if (simulation::is_ready)
@@ -690,19 +694,29 @@ void eu07_application::release_python_lock()
 void eu07_application::exit()
 {
 	Global.applicationQuitOrder = true;
+	// each step of the closing in the log, to tell from it where a closing that hangs stops
+	auto const closing{std::chrono::steady_clock::now()};
+	auto const step = [&](char const *What) {
+		WriteLog(std::string{"Closing: "} + What + " at " + std::to_string(std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::steady_clock::now() - closing).count()) + " ms");
+	};
+	step("the modes");
 	for (auto &mode : m_modes)
 		mode.reset();
 
+	step("the renderer");
 	GfxRenderer->Shutdown();
 	m_network.reset();
 
 	//    SafeDelete( simulation::Train );
+	step("the scenery");
 	SafeDelete(simulation::Region);
 
+	step("the ui and the python workers");
 	ui_layer::shutdown();
 
 	// the python workers detach their GL context on the way out, so they have to be done before the windows they use are destroyed
 	m_taskqueue.exit();
+	step("the windows");
 	for (auto *window : m_windows)
 	{
 		glfwDestroyWindow(window);
@@ -713,6 +727,8 @@ void eu07_application::exit()
 	if (!Global.exec_on_exit.empty())
 		system(Global.exec_on_exit.c_str());
 
+	step("done");
+	StopLogService();
 	auto it = Global.threads.find("LogService");
 	if (it != Global.threads.end())
 	{

nodebank_previews_standalone.cpp

@@ -290,9 +290,9 @@ int generate_nodebank_previews(int Argc, char *Argv[])
 	std::thread logservice(LogService);
 
 	auto const finish = [&](int const Result) {
-		// give the log service time to write out what's left
-		std::this_thread::sleep_for(std::chrono::milliseconds(200));
+		// the log service writes out what's left before it stops
 		Global.applicationQuitOrder = true;
+		StopLogService();
 		logservice.join();
 		return Result;
 	};

utilities/Logs.cpp

@@ -73,12 +73,21 @@ std::deque<std::string> ErrorStack;
 
 // lock for log stacks
 std::mutex logMutex;
+// the log is written through the closing of the simulator, to the end
+std::atomic<bool> logStop{false};
+
+void StopLogService()
+{
+	logStop = true;
+}
 
 
 void LogService()
 {
-	while (!Global.applicationQuitOrder)
+	// one more pass after the stop, so what came just before it gets written too
+	for (bool last{false}; false == last;)
 	{
+		last = logStop;
 		{
 			// --- Obsługa InfoStack ---
 			while (!InfoStack.empty())

utilities/Logs.h

@@ -23,7 +23,9 @@ enum class logtype : unsigned int {
     traction = 1 << 9,
     powergrid = 1 << 10,
 };
+// writes the log until StopLogService(), and all of it that came before
 void LogService();
+void StopLogService();
 void WriteLog( const char *str, logtype const Type = logtype::generic, bool isError = false );
 void Error( const std::string &asMessage, bool box = false );
 void Error( const char* &asMessage, bool box = false );