#ifndef ALIMEMORYWATCHER_H
#define ALIMEMORYWATCHER_H
/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice     */
/* $Id$ */
//_________________________________________________________________________
/*Basic Memory Leak utility.
    
    You can use this tiny class to *see* if your program is leaking.
    Usage:
    AliMemoryWatcher memwatcher;
    some program loop on events here {
      if ( nevents % x == 0 ) 
      {
      // take a sample every x events
        memwatcher.watch(nevents);
      }
    }
    TFile f("out.root","RECREATE");
    memwatcher.write();
    f.Close();
    In the output root file you'll get 3 graphs representing
    the evolAliPHOSon, as a function of the number of events, of :
    - VSIZE is the virtual size (in KBytes) of your program, that is sort of
    the total memory used
    - RSSIZE is the resident size (in KBytes), that is, the part of your 
    program which is really in physical memory.
    - TIME is an estimate of time per event (really it's the time elasped
    between two calls to watch method)
    WARNING: this is far from a bulletproof memory report (it's basically 
    using UNIX command ps -h -p [PID] -o vsize,rssize to do its job).
    It has only been tested on Linux so far.
    
    But by fitting the VSIZE by a pol1 under ROOT, you'll see right away
    by how much your program is leaking.
*/             
//*-- Author: Laurent Aphecetche(SUBATECH)
// --- ROOT system ---
#include "TObject.h" 
class TH2;
class TGraph;
class TStopwatch;
class AliMemoryWatcher : public TObject 
{
public:
  AliMemoryWatcher(UInt_t maxsize=10000);
  AliMemoryWatcher(AliMemoryWatcher& mw);
  AliMemoryWatcher(const AliMemoryWatcher & watcher) {
    // copy ctor: no implementation yet
    Fatal("cpy ctor", "not implemented") ;
  }
  ~AliMemoryWatcher() ;
  void Watch(Int_t x);
  
  UInt_t Size(void) const { return fSize; }
  Int_t X(Int_t n) const { return fX[n]; }
  Int_t VSIZE(Int_t n) const { return fVSIZE[n]; }
  Int_t RSSIZE(Int_t n) const { return fRSSIZE[n]; }
  Double_t TIME(Int_t n) const { return fTIME[n]; }
  TGraph* GraphVSIZE(void);
  TGraph* GraphRSSIZE(void);
  TGraph* GraphTIME(void);
  TH2* Frame(void) const ;
  void Write(void);
  AliMemoryWatcher & operator = (const AliMemoryWatcher &) { return *this; } 
private:
  Int_t fPID;          // PID of the process to watch
  char fCmd[1024];     // the command sent to the system to retrieve things ("ps .....")
  UInt_t fMAXSIZE;     // maximum size of arrays where the informationis stored
  UInt_t fSize;        // the requested size of information to be retrieved
  Int_t* fX;           // array that contains the step numbers
  Int_t* fVSIZE;       // array that contains the virtual memory at each step
  Int_t* fRSSIZE;      // array that contains the real memory at each step
  Double_t* fTIME;     // array that contains the CPU time at each step
  TStopwatch* fTimer;  // the chronometer
  Bool_t fDisabled;    // to switch on/off the monitoring

  ClassDef(AliMemoryWatcher,1) // General purpose memory watcher

} ;
#endif