/*

 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "logging/log.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/timer.hpp"

#include "utilities/ostream.hpp"

double TimeHelper::counter_to_seconds(jlong counter) {

  double freq  = (double) os::elapsed_frequency();

  return counter / freq;

}

double TimeHelper::counter_to_millis(jlong counter) {

  return counter_to_seconds(counter) * 1000.0;

}

elapsedTimer::elapsedTimer(jlong time, jlong timeUnitsPerSecond) {

  _active = false;

  jlong osTimeUnitsPerSecond = os::elapsed_frequency();

  assert(osTimeUnitsPerSecond % 1000 == 0, "must be");

  assert(timeUnitsPerSecond % 1000 == 0, "must be");

  while (osTimeUnitsPerSecond < timeUnitsPerSecond) {

    timeUnitsPerSecond /= 1000;

    time *= 1000;

  }

  while (osTimeUnitsPerSecond > timeUnitsPerSecond) {

    timeUnitsPerSecond *= 1000;

    time /= 1000;

  }

  _counter = time;

}

void elapsedTimer::add(elapsedTimer t) {

  _counter += t._counter;

}

void elapsedTimer::start() {

  if (!_active) {

    _active = true;

    _start_counter = os::elapsed_counter();

  }

}

void elapsedTimer::stop() {

  if (_active) {

    _counter += os::elapsed_counter() - _start_counter;

    _active = false;

  }

}

double elapsedTimer::seconds() const {

 return TimeHelper::counter_to_seconds(_counter);

}

jlong elapsedTimer::milliseconds() const {

  return (jlong)TimeHelper::counter_to_millis(_counter);

}

jlong elapsedTimer::active_ticks() const {

  if (!_active) {

    return ticks();

  }

  jlong counter = _counter + os::elapsed_counter() - _start_counter;

  return counter;

}

void TimeStamp::update_to(jlong ticks) {

  _counter = ticks;

  if (_counter == 0)  _counter = 1;

  assert(is_updated(), "must not look clear");

}

void TimeStamp::update() {

  update_to(os::elapsed_counter());

}

double TimeStamp::seconds() const {

  assert(is_updated(), "must not be clear");

  jlong new_count = os::elapsed_counter();

  return TimeHelper::counter_to_seconds(new_count - _counter);

}

jlong TimeStamp::milliseconds() const {

  assert(is_updated(), "must not be clear");

  jlong new_count = os::elapsed_counter();

  return (jlong)TimeHelper::counter_to_millis(new_count - _counter);

}

jlong TimeStamp::ticks_since_update() const {

  assert(is_updated(), "must not be clear");

  return os::elapsed_counter() - _counter;

}

TraceCPUTime::TraceCPUTime(bool doit,

               bool print_cr,

               outputStream *logfile) :

  _active(doit),

  _print_cr(print_cr),

  _starting_user_time(0.0),

  _starting_system_time(0.0),

  _starting_real_time(0.0),

  _logfile(logfile),

  _error(false) {

  if (_active) {

    if (logfile != NULL) {

      _logfile = logfile;

    } else {

      _logfile = tty;

    }

    _error = !os::getTimesSecs(&_starting_real_time,

                               &_starting_user_time,

                               &_starting_system_time);

  }

}

TraceCPUTime::~TraceCPUTime() {

  if (_active) {

    bool valid = false;

    if (!_error) {

      double real_secs;                 // walk clock time

      double system_secs;               // system time

      double user_secs;                 // user time for all threads

      double real_time, user_time, system_time;

      valid = os::getTimesSecs(&real_time, &user_time, &system_time);

      if (valid) {

        user_secs = user_time - _starting_user_time;

        system_secs = system_time - _starting_system_time;

        real_secs = real_time - _starting_real_time;

        _logfile->print(" [Times: user=%3.2f sys=%3.2f real=%3.2f secs] ",

          user_secs, system_secs, real_secs);

      } else {

        _logfile->print("[Invalid result in TraceCPUTime]");

      }

    } else {

      _logfile->print("[Error in TraceCPUTime]");

    }

    if (_print_cr) {

      _logfile->cr();

    }

    _logfile->flush();

  }

}