/*
  This file is part of LilyPond, the GNU music typesetter.

  Copyright (C) 1997--2020 Han-Wen Nienhuys <hanwen@xs4all.nl>

  LilyPond is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  LilyPond is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "cpu-timer.hh"

#include <unistd.h>
// nextstep
#ifndef CLOCKS_PER_SEC
#ifdef CLK_TCK
#define CLOCKS_PER_SEC CLK_TCK
#elif defined _SC_CLK_TCK
#define CLOCKS_PER_SEC sysconf (_SC_CLK_TCK)
#else
#error cannot determine CLOCKS_PER_SEC
#endif
#endif

Cpu_timer::Cpu_timer ()
{
  restart ();
}
void
Cpu_timer::restart ()
{
  start_clock_ = clock ();
}

Real
Cpu_timer::read ()
{
  clock_t stop = clock ();
  return static_cast<Real> (stop - start_clock_)
         / static_cast<Real> (CLOCKS_PER_SEC);
}
