1/*
2 * Copyright (c) 2014, 2018, 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 "precompiled.hpp"
26#include "jfr/leakprofiler/utilities/granularTimer.hpp"
27
28long GranularTimer::_granularity = 0;
29long GranularTimer::_counter = 0;
30JfrTicks GranularTimer::_finish_time_ticks = 0;
31JfrTicks GranularTimer::_start_time_ticks = 0;
32bool GranularTimer::_finished = false;
33
34void GranularTimer::start(jlong duration_ticks, long granularity) {
35 assert(granularity > 0, "granularity must be at least 1");
36 _granularity = granularity;
37 _counter = granularity;
38 _start_time_ticks = JfrTicks::now();
39 const jlong end_time_ticks = _start_time_ticks.value() + duration_ticks;
40 _finish_time_ticks = end_time_ticks < 0 ? JfrTicks(max_jlong) : JfrTicks(end_time_ticks);
41 _finished = _finish_time_ticks == _start_time_ticks;
42 assert(_finish_time_ticks.value() >= 0, "invariant");
43 assert(_finish_time_ticks >= _start_time_ticks, "invariant");
44}
45void GranularTimer::stop() {
46 if (!_finished) {
47 _finish_time_ticks = JfrTicks::now();
48 }
49}
50const JfrTicks& GranularTimer::start_time() {
51 return _start_time_ticks;
52}
53
54const JfrTicks& GranularTimer::end_time() {
55 return _finish_time_ticks;
56}
57
58bool GranularTimer::is_finished() {
59 assert(_granularity != 0, "GranularTimer::is_finished must be called after GranularTimer::start");
60 if (--_counter == 0) {
61 if (_finished) {
62 // reset so we decrease to zero at next iteration
63 _counter = 1;
64 return true;
65 }
66 if (JfrTicks::now() > _finish_time_ticks) {
67 _finished = true;
68 _counter = 1;
69 return true;
70 }
71 assert(_counter == 0, "invariant");
72 _counter = _granularity; // restore next batch
73 }
74 return false;
75}
76