1 /*
  2  * Copyright (c) 1997, 2025, 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 #include "logging/log.hpp"
 26 #include "oops/oop.inline.hpp"
 27 #include "runtime/os.hpp"
 28 #include "runtime/timer.hpp"
 29 #include "utilities/ostream.hpp"
 30 
 31 double TimeHelper::counter_to_seconds(jlong counter) {
 32   double freq  = (double) os::elapsed_frequency();
 33   return (double)counter / freq;
 34 }
 35 
 36 double TimeHelper::counter_to_millis(jlong counter) {
 37   return counter_to_seconds(counter) * 1000.0;
 38 }
 39 
 40 jlong TimeHelper::millis_to_counter(jlong millis) {
 41   jlong freq = os::elapsed_frequency() / MILLIUNITS;
 42   return millis * freq;
 43 }
 44 
 45 jlong TimeHelper::micros_to_counter(jlong micros) {
 46   jlong freq = os::elapsed_frequency() / MICROUNITS;
 47   return micros * freq;
 48 }
 49 
 50 void elapsedTimer::add(elapsedTimer t) {
 51   _counter += t._counter;
 52 }
 53 
 54 void elapsedTimer::add_nanoseconds(jlong ns) {
 55   jlong freq = os::elapsed_frequency() / NANOUNITS;
 56   _counter += ns * freq;
 57 }
 58 
 59 void elapsedTimer::start() {
 60   if (!_active) {
 61     _active = true;
 62     _start_counter = os::elapsed_counter();
 63   }
 64 }
 65 
 66 void elapsedTimer::stop() {
 67   if (_active) {
 68     _counter += os::elapsed_counter() - _start_counter;
 69     _active = false;
 70   }
 71 }
 72 
 73 double elapsedTimer::seconds() const {
 74  return TimeHelper::counter_to_seconds(_counter);
 75 }
 76 
 77 jlong elapsedTimer::milliseconds() const {
 78   return (jlong)TimeHelper::counter_to_millis(_counter);
 79 }
 80 
 81 jlong elapsedTimer::active_ticks() const {
 82   if (!_active) {
 83     return ticks();
 84   }
 85   jlong counter = _counter + os::elapsed_counter() - _start_counter;
 86   return counter;
 87 }
 88 
 89 void TimeStamp::update_to(jlong ticks) {
 90   _counter = ticks;
 91   if (_counter == 0)  _counter = 1;
 92   assert(is_updated(), "must not look clear");
 93 }
 94 
 95 void TimeStamp::update() {
 96   update_to(os::elapsed_counter());
 97 }
 98 
 99 double TimeStamp::seconds() const {
100   assert(is_updated(), "must not be clear");
101   jlong new_count = os::elapsed_counter();
102   return TimeHelper::counter_to_seconds(new_count - _counter);
103 }
104 
105 jlong TimeStamp::milliseconds() const {
106   assert(is_updated(), "must not be clear");
107   jlong new_count = os::elapsed_counter();
108   return (jlong)TimeHelper::counter_to_millis(new_count - _counter);
109 }
110 
111 jlong TimeStamp::ticks_since_update() const {
112   assert(is_updated(), "must not be clear");
113   return os::elapsed_counter() - _counter;
114 }