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diff --git a/nucleus/library/timely/stopwatch.h b/nucleus/library/timely/stopwatch.h
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+#ifndef STOPWATCH_CLASS
+#define STOPWATCH_CLASS
+
+/***
+*
+*  Name   : stopwatch
+*  Author : Chris Koeritz
+*******************************************************************************
+* Copyright (c) 1991-$now By Author.  This program 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 is online at:      *
+*     http://www.fsf.org/copyleft/gpl.html                                    *
+* Please send any updates to: fred@gruntose.com                               *
+\*****************************************************************************/
+
+#include "time_stamp.h"
+
+namespace timely {
+
+//! A class for measuring event durations in real time.
+/*!
+  Once the stopwatch is constructed, it can then be repeatedly started and
+  halted, and then started again.  The number of milliseconds or
+  microseconds elapsed can be requested while the stopwatch is running, but
+  that can disrupt fine-grained measurements.
+*/
+
+class stopwatch : public virtual basis::root_object
+{
+public:
+  stopwatch();
+  stopwatch(const stopwatch &to_copy);
+
+  virtual ~stopwatch();
+
+  stopwatch &operator =(const stopwatch &to_copy);
+
+  void start();
+    //!< Begins the timing.
+    /*!< If the stopwatch is already timing, then "start" does nothing. */
+
+  void halt();
+    //!< Stops the timing.
+    /*!< start() may be called again to resume timing after the halt.  If the
+    stopwatch is already stopped, or never was started, then halt does nothing. */
+  void stop() { halt(); }
+    //!< a synonym for halt().
+
+  void reset();
+    //!< Stops the stopwatch and clears it to zero time elapsed.
+
+  int milliseconds();
+    //!< Returns the elapsed number of milliseconds on the stopwatch, overall.
+  int elapsed() { return milliseconds(); }
+    //!< a synonym for milliseconds().
+
+private:
+  enum stopwatch_kinds { UNSTARTED, RUNNING, STOPPED };  //!< states for the stopwatch.
+  stopwatch_kinds _status;  //!< our current state.
+  time_stamp *_start_time;  //!< last time we got started.
+  time_stamp *_stop_time;  //!< last time we got stopped.
+  int _total_so_far;  //!< total amount of time run for so far.
+
+  int common_measure();
+    //!< returns the current time used to this point, in milliseconds.
+
+  int compute_diff(const time_stamp &t1, const time_stamp &t2);
+    //!< the difference in milliseconds between the times "t1" and "t2".
+};
+
+//////////////
+
+//! Logs a warning when an operation takes longer than expected.
+/*!
+  Place TIME_CHECK_BEGIN before the code that you want to check, then place
+  TIME_CHECK_END afterwards.  The two calls must be in the same scope.
+  "logger" should be a reference to a log_base object.   [ by Brit Minor ]
+*/
+#define TIME_CHECK_BEGIN \
+  stopwatch t; \
+  t.start();
+#define TIME_CHECK_END(logger, who, msec_limit, what, filter) { \
+  t.halt(); \
+  if (t.milliseconds() > msec_limit) { \
+    (logger).log( a_sprintf("TIME_CHECK: %s: %d ms wait for %s.", \
+        (who), t.milliseconds(), (what)), filter); \
+  } \
+}
+
+} //namespace.
+
+#endif
+