vtkExtensionsGregorianClock.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * $Id: vtkExtensionsGregorianClock.h,v 1.3 2004/08/10 07:37:21 xpxqx Exp $
 *
 * Copyright (c) 2004 Sean McInerney
 * All rights reserved.
 *
 * See Copyright.txt or http://vtkextensions.sourceforge.net/Copyright.html
 * for details.
 *
 *    This software is distributed WITHOUT ANY WARRANTY; without even 
 *    the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
 *    PURPOSE.  See the above copyright notice for more information.
 *
 */
#ifndef VTK_EXTENSIONS_GREGORIAN_CLOCK_H_
#  define VTK_EXTENSIONS_GREGORIAN_CLOCK_H_
#  include "vtkExtensionsCommonConfigure.h" // vtkExtensions configuration
#  include "vtkExtensionsTypes.h"           // vtkExtensions types
// VTK Common
#  include "vtkCriticalSection.h"           // member
#  include "vtkObject.h"

VTK_EXTENSIONS_NAMESPACE_BEGIN

class vtkExtensionsRNG;

class VTK_EXTENSIONS_COMMON_EXPORT vtkExtensionsGregorianClock
  : public vtkObject
{
public:
  static vtkExtensionsGregorianClock* New (void);
  vtkTypeRevisionMacro (vtkExtensionsGregorianClock, vtkObject);
  void PrintSelf (ostream&, vtkIndent);

  void  GetClock (vtkUint32Type& clockHigh,
                  vtkUint32Type& clockLow,
                  vtkUint16Type& resultClockSeq);

  //BTX
  static const vtkUint32Type TimeOffsetLow = VTK_EXTENSIONS_UINT32(0x13814000);
  static const vtkUint32Type TimeOffsetHigh= VTK_EXTENSIONS_UINT32(0x01B21DD2);
  //ETX

  void  SetRNG (vtkExtensionsRNG*);
  vtkGetObjectMacro(RNG, vtkExtensionsRNG);

protected:
  vtkExtensionsGregorianClock (void);
  ~vtkExtensionsGregorianClock();

private:
  //BTX
  // Assume that the gettimeofday() has microsecond granularity.
  static const vtkInt32Type     MaxAdjustment = VTK_EXTENSIONS_INT32(10);

  // Syncronization primatives.
  vtkSimpleCriticalSection      CriticalSection;

  // Clock.
  vtkInt32Type                  Adjustment;
  long                          LastSeconds;
  long                          LastMicroseconds;
  vtkUint16Type                 ClockSeq;

  vtkExtensionsRNG*             RNG;
  //ETX

private:
  vtkExtensionsGregorianClock (const vtkExtensionsGregorianClock&);
  void operator= (const vtkExtensionsGregorianClock&);
};

VTK_EXTENSIONS_NAMESPACE_END

#endif /* VTK_EXTENSIONS_GREGORIAN_CLOCK_H_ */
/*
 * End of: $Id: vtkExtensionsGregorianClock.h,v 1.3 2004/08/10 07:37:21 xpxqx Exp $.
 *
 */

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