/*
//@HEADER
// ************************************************************************
//
//                        Kokkos v. 2.0
//              Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
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// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// Questions? Contact  H. Carter Edwards (hcedwar@sandia.gov)
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//@HEADER
*/

#ifndef KOKKOS_TIMER_HPP
#define KOKKOS_TIMER_HPP

#include <cstddef>

#ifdef _MSC_VER
#undef KOKKOS_ENABLE_LIBRT
#include <gettimeofday.c>
#else
#ifdef KOKKOS_ENABLE_LIBRT
#include <ctime>
#else
#include <sys/time.h>
#endif
#endif

namespace Kokkos {

/** \brief  Time since construction */

class Timer {
private:
  #ifdef KOKKOS_ENABLE_LIBRT
	struct timespec m_old;
  #else
	struct timeval m_old ;
  #endif
  Timer( const Timer & );
  Timer & operator = ( const Timer & );
public:

  inline
  void reset() {
    #ifdef KOKKOS_ENABLE_LIBRT
	  clock_gettime(CLOCK_REALTIME, &m_old);
    #else
	  gettimeofday( & m_old , ((struct timezone *) NULL ) );
    #endif
  }

  inline
  ~Timer() {}

  inline
  Timer() { reset(); }

  inline
  double seconds() const
  {
    #ifdef KOKKOS_ENABLE_LIBRT
      struct timespec m_new;
      clock_gettime(CLOCK_REALTIME, &m_new);

      return ( (double) ( m_new.tv_sec  - m_old.tv_sec ) ) +
             ( (double) ( m_new.tv_nsec - m_old.tv_nsec ) * 1.0e-9 );
    #else
      struct timeval m_new ;

      gettimeofday( & m_new , ((struct timezone *) NULL ) );

      return ( (double) ( m_new.tv_sec  - m_old.tv_sec ) ) +
             ( (double) ( m_new.tv_usec - m_old.tv_usec ) * 1.0e-6 );
    #endif
  }
};

} // namespace Kokkos

#endif /* #ifndef KOKKOS_TIMER_HPP */

