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comparison graal/com.oracle.max.base/src/com/sun/max/profile/Clock.java @ 3733:e233f5660da4

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Added Java files from Maxine project.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sat, 17 Dec 2011 19:59:18 +0100
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3732:3e2e8b8abdaf 3733:e233f5660da4
1 /*
2 * Copyright (c) 2007, 2011, 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 package com.sun.max.profile;
24
25 /**
26 * The {@code Clock} class represents a clock source that has a continuously increasing tick
27 * count. A clock can be used to produce a relative timing between events by comparing the
28 * number of ticks between events. This can be used to implement time-based profiling
29 * by using a clock based on the system time.
30 */
31 public abstract class Clock {
32
33 public abstract long getTicks();
34
35 /**
36 * Gets the resolution of this clock as the number of {@linkplain #getTicks() ticks} per second.
37 * @return the resolution of the clock
38 */
39 public abstract long getHZ();
40
41 public static final Clock SYSTEM_NANOSECONDS = new SystemNS();
42 public static final Clock SYSTEM_MILLISECONDS = new SystemMS();
43
44 private static class SystemMS extends Clock {
45 @Override
46 public long getTicks() {
47 return System.currentTimeMillis();
48 }
49 @Override
50 public long getHZ() {
51 return 1000;
52 }
53 }
54
55 private static class SystemNS extends Clock {
56 @Override
57 public long getTicks() {
58 return System.nanoTime();
59 }
60 @Override
61 public long getHZ() {
62 return 1000000000;
63 }
64 }
65
66 public static int[] sampleDeltas(Clock clock, int numberOfSamples) {
67 final int[] result = new int[numberOfSamples];
68 long sample = clock.getTicks();
69 for (int i = 0; i < numberOfSamples; i++) {
70 final long newSample = clock.getTicks();
71 result[i] = (int) (newSample - sample);
72 sample = newSample;
73 }
74 return result;
75 }
76
77 public static void sample5(Clock clock, long[] samples) {
78 final long sample0 = clock.getTicks();
79 final long sample1 = clock.getTicks();
80 final long sample2 = clock.getTicks();
81 final long sample3 = clock.getTicks();
82 final long sample4 = clock.getTicks();
83 samples[0] = sample0;
84 samples[1] = sample1;
85 samples[2] = sample2;
86 samples[3] = sample3;
87 samples[4] = sample4;
88 }
89 }