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annotate 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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3733
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1 /*
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.max.profile;
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24
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25 /**
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26 * The {@code Clock} class represents a clock source that has a continuously increasing tick
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27 * count. A clock can be used to produce a relative timing between events by comparing the
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28 * number of ticks between events. This can be used to implement time-based profiling
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29 * by using a clock based on the system time.
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30 */
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31 public abstract class Clock {
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32
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33 public abstract long getTicks();
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34
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35 /**
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36 * Gets the resolution of this clock as the number of {@linkplain #getTicks() ticks} per second.
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37 * @return the resolution of the clock
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38 */
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39 public abstract long getHZ();
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40
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41 public static final Clock SYSTEM_NANOSECONDS = new SystemNS();
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42 public static final Clock SYSTEM_MILLISECONDS = new SystemMS();
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43
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44 private static class SystemMS extends Clock {
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45 @Override
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46 public long getTicks() {
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47 return System.currentTimeMillis();
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48 }
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49 @Override
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50 public long getHZ() {
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51 return 1000;
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52 }
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53 }
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54
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55 private static class SystemNS extends Clock {
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56 @Override
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57 public long getTicks() {
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58 return System.nanoTime();
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59 }
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60 @Override
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61 public long getHZ() {
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62 return 1000000000;
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63 }
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64 }
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65
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66 public static int[] sampleDeltas(Clock clock, int numberOfSamples) {
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67 final int[] result = new int[numberOfSamples];
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68 long sample = clock.getTicks();
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69 for (int i = 0; i < numberOfSamples; i++) {
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70 final long newSample = clock.getTicks();
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71 result[i] = (int) (newSample - sample);
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72 sample = newSample;
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73 }
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74 return result;
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75 }
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76
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77 public static void sample5(Clock clock, long[] samples) {
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78 final long sample0 = clock.getTicks();
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79 final long sample1 = clock.getTicks();
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80 final long sample2 = clock.getTicks();
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81 final long sample3 = clock.getTicks();
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82 final long sample4 = clock.getTicks();
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83 samples[0] = sample0;
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84 samples[1] = sample1;
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85 samples[2] = sample2;
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86 samples[3] = sample3;
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87 samples[4] = sample4;
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88 }
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89 }