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// Copyright (C) 2006 International Business Machines and others.
// All Rights Reserved.
// This code is published under the Common Public License.
//
// $Id: IpTimedTask.hpp 735 2006-06-04 06:10:05Z andreasw $
//
// Authors:  Andreas Waechter               IBM    2005-09-19

#ifndef __IPTIMEDTASK_HPP__
#define __IPTIMEDTASK_HPP__

#ifdef HAVE_CTIME
# include <ctime>
#else
# ifdef HAVE_TIME_H
#  include <time.h>
# else
#  error "don't have header file for time"
# endif
#endif

// The following lines are copied from CoinTime.hpp
// We should probably make some more tests here
#if defined(_MSC_VER)
// Turn off compiler warning about long names
#  pragma warning(disable:4786)
#else
// MacOS-X and FreeBSD needs sys/time.h
# if defined(__MACH__) || defined (__FreeBSD__)
#  include <sys/time.h>
# endif
# if !defined(__MSVCRT__)
#  include <sys/resource.h>
# endif
#endif

namespace Ipopt
{
  class TimedTask
  {
  public:
    TimedTask()
        :
        total_time_(0.),
        start_called_(false),
        end_called_(true)
    {}

    ~TimedTask()
    {}

    void Reset()
    {
      total_time_ = 0.;
      start_called_ = false;
      end_called_ = true;
    }

    void Start()
    {
      DBG_ASSERT(end_called_);
      DBG_ASSERT(!start_called_);
      end_called_ = false;
      start_called_ = true;
      start_time_ = CpuTime();
    }

    void End()
    {
      DBG_ASSERT(!end_called_);
      DBG_ASSERT(start_called_);
      end_called_ = true;
      start_called_ = false;
      total_time_ += CpuTime() - start_time_;
    }

    void EndIfStarted()
    {
      if (start_called_) {
        end_called_ = true;
        start_called_ = false;
        total_time_ += CpuTime() - start_time_;
      }
      DBG_ASSERT(end_called_);
    }

    Number TotalTime() const
    {
      DBG_ASSERT(end_called_);
      return total_time_;
    }

    // The following lines were taken from CoinTime.hpp in COIN/Coin
    static inline Number CpuTime()
    {
      double cpu_temp;
#if defined(_MSC_VER) || defined(__MSVCRT__)

      unsigned int ticksnow;        /* clock_t is same as int */

      ticksnow = (unsigned int)clock();

      cpu_temp = (double)((double)ticksnow/CLOCKS_PER_SEC);
#else

      struct rusage usage;
      getrusage(RUSAGE_SELF,&usage);
      cpu_temp = usage.ru_utime.tv_sec;
      cpu_temp += 1.0e-6*((double) usage.ru_utime.tv_usec);
#endif

      return cpu_temp;
    }

  private:
    TimedTask(const TimedTask&);

    void operator=(const TimedTask&);

    Number start_time_;
    Number total_time_;

    bool start_called_;
    bool end_called_;

  };
} // namespace Ipopt

#endif

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