Migrating to new directory structure adopted from the RealVNC's source tree. More changes will follow.
git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@590 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/unix/x0vncserver/PollingScheduler.h b/unix/x0vncserver/PollingScheduler.h
new file mode 100644
index 0000000..2e3e5be
--- /dev/null
+++ b/unix/x0vncserver/PollingScheduler.h
@@ -0,0 +1,98 @@
+/* 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__
+