Quellcode-Bibliothek

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Datei: te.xml Sprache: C

/*
* Copyright (c) 1997, 2020, 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.
*
*/

#ifndef SHARE_RUNTIME_TIMER_HPP
#define SHARE_RUNTIME_TIMER_HPP

#include "utilities/globalDefinitions.hpp"

// Timers for simple measurement.

class elapsedTimer {
  friend class VMStructs;
private:
  jlong _counter;
  jlong _start_counter;
  bool  _active;
public:
  elapsedTimer()             { _active = false; reset(); }
  void add(elapsedTimer t);
  void add_nanoseconds(jlong ns);
  void start();
  void stop();
  void reset()               { _counter = 0; }
  double seconds() const;
  jlong milliseconds() const;
  jlong ticks() const        { return _counter; }
  jlong active_ticks() const;
  bool  is_active() const { return _active; }
};

// TimeStamp is used for recording when an event took place.
class TimeStamp {
private:
  jlong _counter;
public:
  TimeStamp()  { _counter = 0; }
  // has the timestamp been updated since being created or cleared?
  bool is_updated() const { return _counter != 0; }
  // update to current elapsed time
  void update();
  // update to given elapsed time
  void update_to(jlong ticks);
  // returns seconds since updated
  // (must not be in a cleared state:  must have been previously updated)
  double seconds() const;
  jlong milliseconds() const;
  // ticks elapsed between VM start and last update
  jlong ticks() const { return _counter; }
  // ticks elapsed since last update
  jlong ticks_since_update() const;
};

class TimeHelper {
public:
  static double counter_to_seconds(jlong counter);
  static double counter_to_millis(jlong counter);
  static jlong millis_to_counter(jlong millis);
  static jlong micros_to_counter(jlong micros);
};

#endif // SHARE_RUNTIME_TIMER_HPP

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^© Kompilation durch diese Firma

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Datei: te.xml Sprache: C

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