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diff --git a/src/lib/base/Stopwatch.h b/src/lib/base/Stopwatch.h
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+/*
+ * barrier -- mouse and keyboard sharing utility
+ * Copyright (C) 2012-2016 Symless Ltd.
+ * Copyright (C) 2002 Chris Schoeneman
+ * 
+ * This package is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * found in the file LICENSE that should have accompanied this file.
+ * 
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "common/common.h"
+
+//! A timer class
+/*!
+This class measures time intervals.  All time interval measurement
+should use this class.
+*/
+class Stopwatch {
+public:
+    /*!
+    The default constructor does an implicit reset() or setTrigger().
+    If triggered == false then the clock starts ticking.
+    */
+    Stopwatch(bool triggered = false);
+    ~Stopwatch();
+
+    //! @name manipulators
+    //@{
+
+    //! Reset the timer to zero
+    /*!
+    Set the start time to the current time, returning the time since
+    the last reset.  This does not remove the trigger if it's set nor
+    does it start a stopped clock.  If the clock is stopped then
+    subsequent reset()'s will return 0.
+    */
+    double                reset();
+
+    //! Stop the timer
+    /*!
+    Stop the stopwatch.  The time interval while stopped is not
+    counted by the stopwatch.  stop() does not remove the trigger.
+    Has no effect if already stopped.
+    */
+    void                stop();
+
+    //! Start the timer
+    /*!
+    Start the stopwatch.  start() removes the trigger, even if the
+    stopwatch was already started.
+    */
+    void                start();
+
+    //! Stop the timer and set the trigger
+    /*!
+    setTrigger() stops the clock like stop() except there's an
+    implicit start() the next time (non-const) getTime() is called.
+    This is useful when you want the clock to start the first time
+    you check it.
+    */
+    void                setTrigger();
+
+    //! Get elapsed time
+    /*!
+    Returns the time since the last reset() (or calls reset() and
+    returns zero if the trigger is set).
+    */
+    double                getTime();
+    //! Same as getTime()
+                        operator double();
+    //@}
+    //! @name accessors
+    //@{
+
+    //! Check if timer is stopped
+    /*!
+    Returns true if the stopwatch is stopped.
+    */
+    bool                isStopped() const;
+
+    // return the time since the last reset().  
+    //! Get elapsed time
+    /*!
+    Returns the time since the last reset().  This cannot trigger the
+    stopwatch to start and will not clear the trigger.
+    */
+    double                getTime() const;
+    //! Same as getTime() const
+                        operator double() const;
+    //@}
+
+private:
+    double                getClock() const;
+
+private:
+    double                m_mark;
+    bool                m_triggered;
+    bool                m_stopped;
+};