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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();
-
- // Check if the object is active (not in the initial state).
- bool isRunning();
-
- // 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__
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