/*

 * Copyright (c) 2001, 2019, 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.

 *

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#ifndef SHARE_GC_G1_G1INITIALMARKTOMIXEDTIMETRACKER_HPP

#define SHARE_GC_G1_G1INITIALMARKTOMIXEDTIMETRACKER_HPP

#include "utilities/globalDefinitions.hpp"

#include "utilities/debug.hpp"

// Used to track time from the end of initial mark to the first mixed GC.

// After calling the initial mark/mixed gc notifications, the result can be

// obtained in last_marking_time() once, after which the tracking resets.

// Any pauses recorded by add_pause() will be subtracted from that results.

class G1InitialMarkToMixedTimeTracker {

private:

  bool _active;

  double _initial_mark_end_time;

  double _mixed_start_time;

  double _total_pause_time;

  double wall_time() const {

    return _mixed_start_time - _initial_mark_end_time;

  }

public:

  G1InitialMarkToMixedTimeTracker() { reset(); }

  // Record initial mark pause end, starting the time tracking.

  void record_initial_mark_end(double end_time) {

    assert(!_active, "Initial mark out of order.");

    _initial_mark_end_time = end_time;

    _active = true;

  }

  // Record the first mixed gc pause start, ending the time tracking.

  void record_mixed_gc_start(double start_time) {

    if (_active) {

      _mixed_start_time = start_time;

      _active = false;

    }

  }

  double last_marking_time() {

    assert(has_result(), "Do not have all measurements yet.");

    double result = (_mixed_start_time - _initial_mark_end_time) - _total_pause_time;

    reset();

    return result;

  }

  void reset() {

    _active = false;

    _total_pause_time = 0.0;

    _initial_mark_end_time = -1.0;

    _mixed_start_time = -1.0;

  }

  void add_pause(double time) {

    if (_active) {

      _total_pause_time += time;

    }

  }

  // Returns whether we have a result that can be retrieved.

  bool has_result() const { return _mixed_start_time > 0.0 && _initial_mark_end_time > 0.0; }

};

#endif // SHARE_GC_G1_G1INITIALMARKTOMIXEDTIMETRACKER_HPP