diff --git a/unix/x0vncserver/PollingScheduler.h b/unix/x0vncserver/PollingScheduler.h
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+++ b/unix/x0vncserver/PollingScheduler.h
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+/* Copyright (C) 2006 Constantin Kaplinsky.  All Rights Reserved.
+ *    
+ * This 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 software 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 software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+//
+// PollingScheduler class. It is used for deciding when to start new
+// polling pass, and how much time it is ok to sleep before starting. 
+// PollingScheduler is given a desired polling interval, but it can
+// add time between polling passes if needed for satisfying processor
+// usage limitation.
+//
+
+#ifndef __POLLINGSCHEDULER_H__
+#define __POLLINGSCHEDULER_H__
+
+#include <x0vncserver/TimeMillis.h>
+
+class PollingScheduler {
+
+public:
+
+  PollingScheduler(int interval, int maxload = 50);
+
+  // Set polling parameters.
+  void setParameters(int interval, int maxload = 50);
+
+  // Reset the object into the initial state (no polling performed).
+  void reset();
+
+  // Tell the scheduler that new polling pass is just being started.
+  void newPass();
+
+  // Inform the scheduler about times when we sleep.
+  void sleepStarted();
+  void sleepFinished();
+
+  // This function estimates time remaining before new polling pass.
+  int millisRemaining() const;
+
+  // This function tells if it's ok to start polling pass right now.
+  bool goodTimeToPoll() const;
+
+protected:
+
+  // Parameters.
+  int m_interval;
+  int m_maxload;
+
+  // This boolean flag is true when we do not poll the screen.
+  bool m_initialState;
+
+  // Time stamp saved on starting current polling pass.
+  TimeMillis m_passStarted;
+
+  // Desired duration of current polling pass.
+  int m_ratedDuration;
+
+  // These are for measuring sleep time in current pass.
+  TimeMillis m_sleepStarted;
+  bool m_sleeping;
+  int m_sleptThisPass;
+
+  // Ring buffer for tracking past timing errors.
+  int m_errors[8];
+  int m_errorSum;
+  int m_errorAbsSum;
+
+  // Ring buffer for tracking total pass durations (work + sleep).
+  int m_durations[8];
+  int m_durationSum;
+
+  // Ring buffer for tracking past sleep times.
+  int m_slept[8];
+  int m_sleptSum;
+
+  // Indexer for all ring buffers.
+  int m_idx;
+
+  // Pass counter.
+  int m_count;
+};
+
+#endif // __POLLINGSCHEDULER_H__
+