fixed: the way how winix is closing

beforehand we made a http connection from the special thread
       now we just send a fastcgi packet to the unix socket

       the old way was broken because it requires the http server to work
       and if the operating system is going to shutdown/reboot then the http server
       can be first closed and consequently the winix cannot wake up from
       the main thread (and will be terminated SIGKILL by the os)
       



git-svn-id: svn://ttmath.org/publicrep/winix/trunk@998 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/app.h

@@ -147,7 +147,7 @@ private:
 	int fcgi_socket;
 	Synchro synchro;
 	pthread_t signal_thread;
-	std::string url_to_fetch_on_exit;
+	std::string socket_to_send_on_exit;
 	std::string send_data_buf;
 	PT::SpaceToJSON json_generic_serializer;
 	TextStream<std::wstring> json_out_stream;
@@ -225,8 +225,7 @@ private:
 	void LogGroups();
 
 	static void * SpecialThreadForSignals(void*);
-	static size_t FetchPageOnExitCurlCallback(char *ptr, size_t size, size_t nmemb, void *userdata);
-	void FetchPageOnExit();
+	void SendEmptyFastCGIPacket();
 
 	void CreateStaticTree();