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diff --git a/ETL/ETL/_clock_base.h b/ETL/ETL/_clock_base.h
new file mode 100644
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+/*! ========================================================================
+** Extended Template and Library
+** Clock Abstraction Implementation
+** $Id$
+**
+** Copyright (c) 2002 Robert B. Quattlebaum Jr.
+**
+** This package is free software; you can redistribute it and/or
+** modify it under the terms of the GNU General Public License as
+** published by the Free Software Foundation; either version 2 of
+** the License, or (at your option) any later version.
+**
+** This package is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+** General Public License for more details.
+**
+** === N O T E S ===========================================================
+**
+** This is an internal header file, included by other ETL headers.
+** You should not attempt to use it directly.
+**
+** ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __ETL__CLOCK_H
+#define __ETL__CLOCK_H
+
+/* === H E A D E R S ======================================================= */
+
+#ifndef WIN32
+#include <unistd.h>
+#else
+inline void sleep(int i) { Sleep(i*1000); }
+#endif
+
+/* === M A C R O S ========================================================= */
+
+/* === T Y P E D E F S ===================================================== */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+_ETL_BEGIN_NAMESPACE
+
+inline void yield() { sleep(0); }
+
+/*! ========================================================================
+** \class	clock_base
+** \brief	clock abstraction
+**
+** A more detailed description needs to be written.
+*/
+template <class DESC>
+class clock_base : public DESC
+{
+public:
+	typedef typename DESC::value_type value_type;
+
+private:
+	typedef clock_base<DESC> _clock;
+	typedef typename DESC::timestamp timestamp;
+
+	timestamp base_time;
+
+	using DESC::get_current_time;
+	using DESC::realtime;
+	using DESC::one_second;
+public:
+
+	clock_base() { reset(); }
+
+	void reset()
+	{ get_current_time(base_time); }
+
+	value_type operator()()const
+	{ return timestamp_to_seconds(get_current_time()-base_time); }
+
+	value_type pop_time()
+	{
+		// Grab the old base time
+		timestamp old_time=base_time;
+
+		// Put the current time into base_time
+		get_current_time(base_time);
+
+		return timestamp_to_seconds(base_time-old_time);
+	}
+
+	static void
+	sleep(const value_type &length)
+	{
+		if(!realtime())
+			::sleep((int)(length+0.5));
+		else
+		{
+			_clock timer;
+			timer.reset();
+			value_type val;
+			for(val=timer();one_second()<length-val;val=timer())
+				::sleep((int)((length-val)/2.0+0.4));
+			while(timer()<length)
+			  ;
+		}
+
+
+		/* This is a different waiting mechanism that uses
+		** the native timestamp type of the clock rather
+		** than converting it to a double (or whatever).
+		** You would think that this would be at least a
+		** few microseconds faster, but a few tests on my
+		** PowerBook G4 have proved otherwise. Indeed I loose
+		** several microseconds using this "optimized" method.
+		** Bizarre.
+		**	- darco (8-17-2002)
+		{
+			timestamp endtime=get_current_time()+seconds_to_timestamp(length);
+			timestamp loopendtime=get_current_time()+seconds_to_timestamp(length-1.0);
+			while(get_current_time()<loopendtime)
+				::sleep((int)timestamp_to_seconds(loopendtime-get_current_time())/2.0);
+			while(get_current_time()<endtime);
+		}
+		*/
+
+		return;
+	}
+};
+
+_ETL_END_NAMESPACE
+
+/* === E N D =============================================================== */
+
+#endif