Mercurial > hg > truffle
view graal/com.oracle.max.base/src/com/sun/max/profile/Clock.java @ 4186:71a2cd79c375
Made stdout for mx unbuffered.
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 03 Jan 2012 13:53:38 +0100 |
parents | e233f5660da4 |
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/* * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.max.profile; /** * The {@code Clock} class represents a clock source that has a continuously increasing tick * count. A clock can be used to produce a relative timing between events by comparing the * number of ticks between events. This can be used to implement time-based profiling * by using a clock based on the system time. */ public abstract class Clock { public abstract long getTicks(); /** * Gets the resolution of this clock as the number of {@linkplain #getTicks() ticks} per second. * @return the resolution of the clock */ public abstract long getHZ(); public static final Clock SYSTEM_NANOSECONDS = new SystemNS(); public static final Clock SYSTEM_MILLISECONDS = new SystemMS(); private static class SystemMS extends Clock { @Override public long getTicks() { return System.currentTimeMillis(); } @Override public long getHZ() { return 1000; } } private static class SystemNS extends Clock { @Override public long getTicks() { return System.nanoTime(); } @Override public long getHZ() { return 1000000000; } } public static int[] sampleDeltas(Clock clock, int numberOfSamples) { final int[] result = new int[numberOfSamples]; long sample = clock.getTicks(); for (int i = 0; i < numberOfSamples; i++) { final long newSample = clock.getTicks(); result[i] = (int) (newSample - sample); sample = newSample; } return result; } public static void sample5(Clock clock, long[] samples) { final long sample0 = clock.getTicks(); final long sample1 = clock.getTicks(); final long sample2 = clock.getTicks(); final long sample3 = clock.getTicks(); final long sample4 = clock.getTicks(); samples[0] = sample0; samples[1] = sample1; samples[2] = sample2; samples[3] = sample3; samples[4] = sample4; } }