NTP sync in separate thread

libi2pd/Timestamp.h

@@ -2,6 +2,10 @@
 #define TIMESTAMP_H__
 
 #include <inttypes.h>
+#include <thread>
+#include <vector>
+#include <string>
+#include <boost/asio.hpp>
 
 namespace i2p
 {
@@ -11,7 +15,30 @@ namespace util
 	uint32_t GetHoursSinceEpoch ();
 	uint64_t GetSecondsSinceEpoch ();
 
-	void RequestNTPTimeSync ();
+	class NTPTimeSync
+	{
+		public:
+
+			NTPTimeSync ();
+			~NTPTimeSync ();
+
+			void Start ();
+        	void Stop ();
+
+		private:
+			
+			void Run ();
+			void Sync ();		
+
+		private:
+
+			bool m_IsRunning;
+       		std::unique_ptr<std::thread> m_Thread;
+			boost::asio::io_service m_Service;
+			boost::asio::deadline_timer m_Timer;
+			int m_SyncInterval;
+			std::vector<std::string> m_NTPServersList;
+	};
 }
 }