1 /*
   2  * Copyright (c) 2011, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_JFR_UTILITIES_JFRTIMECONVERTER_HPP
  26 #define SHARE_VM_JFR_UTILITIES_JFRTIMECONVERTER_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "utilities/globalDefinitions.hpp"
  30 
  31 class JfrTimeConverter : AllStatic {
  32  private:
  33   static double counter_to_nano_multiplier(bool is_os_time = false);
  34   static double counter_to_nanos_internal(jlong c, bool is_os_time = false);
  35   static double counter_to_millis_internal(jlong c, bool is_os_time = false);
  36   static void initialize();
  37 
  38  public:
  39   static const double NANOS_PER_SEC;
  40   static const double NANOS_PER_MILLISEC;
  41   static const double NANOS_PER_MICROSEC;
  42 
  43   // factors
  44   static double nano_to_counter_multiplier(bool is_os_time = false);
  45   // ticks to nanos
  46   static jlong counter_to_nanos(jlong c, bool is_os_time = false);
  47   // ticks to millis
  48   static jlong counter_to_millis(jlong c, bool is_os_time = false);
  49   // nanos to ticks
  50   static jlong nanos_to_countertime(jlong c, bool as_os_time = false);
  51 };
  52 
  53 #endif // SHARE_VM_JFR_UTILITIES_JFRTIMECONVERTER_HPP