TStopwatch.h

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// @(#)root/base:$Id$
// Author: Fons Rademakers   11/10/95
 
/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT_TStopwatch
#define ROOT_TStopwatch
 
 
//////////////////////////////////////////////////////////////////////////
//                                                                      //
// TStopwatch                                                           //
//                                                                      //
// Stopwatch class. This class returns the real and cpu time between    //
// the start and stop events.                                           //
//                                                                      //
//////////////////////////////////////////////////////////////////////////
 
#include "TObject.h"
 
 
class TStopwatch : public TObject {
 
private:
   enum EState { kUndefined, kStopped, kRunning };
 
   Double_t     fStartRealTime;   //wall clock start time
   Double_t     fStopRealTime;    //wall clock stop time
   Double_t     fStartCpuTime;    //cpu start time
   Double_t     fStopCpuTime;     //cpu stop time
   Double_t     fTotalCpuTime;    //total cpu time
   Double_t     fTotalRealTime;   //total real time
   EState       fState;           //stopwatch state
   Int_t        fCounter;         //number of times the stopwatch was started
 
   static Double_t GetRealTime();
   static Double_t GetCPUTime();
 
public:
   TStopwatch();
   void        Start(Bool_t reset = kTRUE);
   void        Stop();
   void        Continue();
   Int_t       Counter() const { return fCounter; }
   Double_t    RealTime();
   void        Reset() { ResetCpuTime(); ResetRealTime(); }
   void        ResetCpuTime(Double_t time = 0) { Stop();  fTotalCpuTime = time; }
   void        ResetRealTime(Double_t time = 0) { Stop(); fTotalRealTime = time; }
   Double_t    CpuTime();
   void        Print(Option_t *option="") const;
 
   ClassDef(TStopwatch,1)  //A stopwatch which times real and cpu time
};
 
#endif