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comparison src/share/vm/utilities/ticks.cpp @ 17478:e254e5940c19

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Merge
author kizune
date Thu, 05 Dec 2013 16:37:29 +0400
parents 86e6d691f2e1
children
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17477:0611ce949aaa 17478:e254e5940c19
1 /*
2 * Copyright (c) 2013, 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 "runtime/os.hpp"
27 #include "utilities/ticks.inline.hpp"
28
29 #ifdef ASSERT
30 const jlong Ticks::invalid_time_stamp = -2; // 0xFFFF FFFF`FFFF FFFE
31 #endif
32
33 void Ticks::stamp() {
34 _stamp_ticks = os::elapsed_counter();
35 }
36
37 const Ticks Ticks::now() {
38 Ticks t;
39 t.stamp();
40 return t;
41 }
42
43 Tickspan::Tickspan(const Ticks& end, const Ticks& start) {
44 assert(end.value() != Ticks::invalid_time_stamp, "end is unstamped!");
45 assert(start.value() != Ticks::invalid_time_stamp, "start is unstamped!");
46
47 assert(end >= start, "negative time!");
48
49 _span_ticks = end.value() - start.value();
50 }
51
52 template <typename ReturnType>
53 static ReturnType time_conversion(const Tickspan& span, TicksToTimeHelper::Unit unit) {
54 assert(TicksToTimeHelper::SECONDS == unit ||
55 TicksToTimeHelper::MILLISECONDS == unit, "invalid unit!");
56
57 ReturnType frequency_per_unit = (ReturnType)os::elapsed_frequency() / (ReturnType)unit;
58
59 return (ReturnType) ((ReturnType)span.value() / frequency_per_unit);
60 }
61
62 double TicksToTimeHelper::seconds(const Tickspan& span) {
63 return time_conversion<double>(span, SECONDS);
64 }
65
66 jlong TicksToTimeHelper::milliseconds(const Tickspan& span) {
67 return time_conversion<jlong>(span, MILLISECONDS);
68 }