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/thread.hpp"
 29 #include "runtime/timer.hpp"
 30 #include "utilities/ostream.hpp"
 31 
 32 double TimeHelper::counter_to_seconds(jlong counter) {
 33   double freq  = (double) os::elapsed_frequency();
 34   return (double)counter / freq;
 35 }
 36 
 37 double TimeHelper::counter_to_millis(jlong counter) {
 38   return counter_to_seconds(counter) * 1000.0;
 39 }
 40 
 41 jlong TimeHelper::millis_to_counter(jlong millis) {
 42   jlong freq = os::elapsed_frequency() / MILLIUNITS;
 43   return millis * freq;
 44 }
 45 
 46 jlong TimeHelper::micros_to_counter(jlong micros) {
 47   jlong freq = os::elapsed_frequency() / MICROUNITS;
 48   return micros * freq;
 49 }
 50 
 51 void BaseTimer::add(BaseTimer* t) {
 52   _counter += t->_counter;
 53 }
 54 
 55 void BaseTimer::add_nanoseconds(jlong ns) {
 56   jlong freq = os::elapsed_frequency() / NANOUNITS;
 57   _counter += ns * freq;
 58 }
 59 
 60 void BaseTimer::start() {
 61   if (!_active) {
 62     _active = true;
 63     _start_counter = read_counter();
 64   }
 65 }
 66 
 67 void BaseTimer::stop() {
 68   if (_active) {
 69     _counter += read_counter() - _start_counter;
 70     _active = false;
 71   }
 72 }
 73 
 74 double BaseTimer::seconds() const {
 75  return TimeHelper::counter_to_seconds(_counter);
 76 }
 77 
 78 jlong BaseTimer::milliseconds() const {
 79   return (jlong)TimeHelper::counter_to_millis(_counter);
 80 }
 81 
 82 jlong BaseTimer::active_ticks() const {
 83   if (!_active) {
 84     return ticks();
 85   }
 86   jlong counter = _counter + read_counter() - _start_counter;
 87   return counter;
 88 }
 89 
 90 jlong elapsedTimer::read_counter() const {
 91   return os::elapsed_counter();
 92 }
 93 
 94 ThreadTimer::ThreadTimer() {
 95   _owner = Thread::current();
 96 }
 97 
 98 void ThreadTimer::start() {
 99   assert(_owner != nullptr, "timer must be bound to a thread");
100   Thread* current = Thread::current();
101   assert(current == _owner, "timer can only be started by the thread that owns it");
102   BaseTimer::start();
103 }
104 
105 void ThreadTimer::stop() {
106   assert(_owner != nullptr, "sanity check");
107   Thread* current = Thread::current();
108   assert(current == _owner, "timer can only be stopped by the thread that owns it");
109   if (_start_counter != -1) {
110     BaseTimer::stop();
111   }
112 }
113 
114 jlong ThreadTimer::read_counter() const {
115   assert(_owner != nullptr, "sanity check");
116   return os::thread_cpu_time(_owner);
117 }
118 
119 void TimeStamp::update_to(jlong ticks) {
120   _counter = ticks;
121   if (_counter == 0)  _counter = 1;
122   assert(is_updated(), "must not look clear");
123 }
124 
125 void TimeStamp::update() {
126   update_to(os::elapsed_counter());
127 }
128 
129 double TimeStamp::seconds() const {
130   assert(is_updated(), "must not be clear");
131   jlong new_count = os::elapsed_counter();
132   return TimeHelper::counter_to_seconds(new_count - _counter);
133 }
134 
135 jlong TimeStamp::milliseconds() const {
136   assert(is_updated(), "must not be clear");
137   jlong new_count = os::elapsed_counter();
138   return (jlong)TimeHelper::counter_to_millis(new_count - _counter);
139 }
140 
141 jlong TimeStamp::ticks_since_update() const {
142   assert(is_updated(), "must not be clear");
143   return os::elapsed_counter() - _counter;
144 }