Add RateLimiter for rate limiting multicast, not tested yet.

node/Utils.hpp

@@ -347,6 +347,17 @@ public:
 		return ( (1000ULL * (uint64_t)tv.tv_sec) + (uint64_t)(tv.tv_usec / 1000) );
 	};
 
+	/**
+	 * @return Current time in seconds since epoch, to the highest available resolution
+	 */
+	static inline double nowf()
+		throw()
+	{
+		struct timeval tv;
+		gettimeofday(&tv,(struct timezone *)0);
+		return ( ((double)tv.tv_sec) + (((double)tv.tv_usec) / 1000000.0) );
+	}
+
 	/**
 	 * Read the full contents of a file into a string buffer
 	 *