JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2011, 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * 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).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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#ifndef SHARE_JFR_UTILITIES_JFRTIMECONVERTER_HPP
#define SHARE_JFR_UTILITIES_JFRTIMECONVERTER_HPP

#include "memory/allocation.hpp"
#include "utilities/globalDefinitions.hpp"

class JfrTimeConverter : AllStatic {
 private:
  static double counter_to_nano_multiplier(bool is_os_time = false);
  static double counter_to_nanos_internal(jlong c, bool is_os_time = false);
  static double counter_to_millis_internal(jlong c, bool is_os_time = false);
  static void initialize();

 public:
  static const double NANOS_PER_SEC;
  static const double NANOS_PER_MILLISEC;
  static const double NANOS_PER_MICROSEC;

  // factors
  static double nano_to_counter_multiplier(bool is_os_time = false);
  // ticks to nanos
  static jlong counter_to_nanos(jlong c, bool is_os_time = false);
  // ticks to millis

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