--- a/jdk/test/sun/misc/VM/GetNanoTimeAdjustment.java Tue Jan 12 18:02:07 2016 +0300
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,250 +0,0 @@
-/*
- * Copyright (c) 2015, 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.
- */
-import java.util.Objects;
-import sun.misc.VM;
-
-/**
- * @test
- * @bug 8068730
- * @summary tests that VM.getgetNanoTimeAdjustment() works as expected.
- * @modules java.base/sun.misc
- * @run main GetNanoTimeAdjustment
- * @author danielfuchs
- */
-public class GetNanoTimeAdjustment {
-
- static final int MILLIS_IN_SECOND = 1000;
- static final int NANOS_IN_MILLI = 1000_000;
- static final int NANOS_IN_MICRO = 1000;
- static final int NANOS_IN_SECOND = 1000_000_000;
-
- static final boolean verbose = true;
-
- static final class TestAssertException extends RuntimeException {
- TestAssertException(String msg) { super(msg); }
- }
-
- private static void assertEquals(long expected, long received, String msg) {
- if (expected != received) {
- throw new TestAssertException("Unexpected result for " + msg
- + ".\n\texpected: " + expected
- + "\n\tactual: " + received);
- } else if (verbose) {
- System.out.println("Got expected " + msg + ": " + received);
- }
- }
-
- private static void assertEquals(Object expected, Object received, String msg) {
- if (!Objects.equals(expected, received)) {
- throw new TestAssertException("Unexpected result for " + msg
- + ".\n\texpected: " + expected
- + "\n\tactual: " + received);
- } else if (verbose) {
- System.out.println("Got expected " + msg + ": " + received);
- }
- }
-
- static final long MAX_OFFSET = 0x0100000000L;
- static final long MIN_OFFSET = -MAX_OFFSET;
- static enum Answer {
- YES, // isOffLimit = YES: we must get -1
- NO, // isOffLimit = NO: we must not not get -1
- MAYBE // isOffLimit = MAYBE: we might get -1 or a valid adjustment.
- };
- static long distance(long one, long two) {
- return one > two ? Math.subtractExact(one, two)
- : Math.subtractExact(two, one);
- }
-
-
- static Answer isOffLimits(long before, long after, long offset) {
- long relativeDistanceBefore = distance(before, offset);
- long relativeDistanceAfter = distance(after, offset);
- if (relativeDistanceBefore >= MAX_OFFSET && relativeDistanceAfter >= MAX_OFFSET) {
- return Answer.YES;
- }
- if (relativeDistanceBefore < MAX_OFFSET && relativeDistanceAfter < MAX_OFFSET) {
- if (relativeDistanceBefore == 0 || relativeDistanceAfter == 0) {
- return Answer.MAYBE; // unlucky case where
- }
- return Answer.NO;
- }
- return Answer.MAYBE;
- }
-
- static void testWithOffset(String name, long offset) {
- System.out.println("Testing with offset: " + name);
- long beforeMillis = System.currentTimeMillis();
- long adjustment = VM.getNanoTimeAdjustment(offset);
- long afterMillis = System.currentTimeMillis();
-
- if (offset >= beforeMillis/MILLIS_IN_SECOND
- && offset <= afterMillis/MILLIS_IN_SECOND) {
- if (adjustment == -1) {
- // it's possible that we have fallen in the unlucky case
- // where -1 was the genuine result. let's go backward a bit.
- offset = offset - 10;
- beforeMillis = System.currentTimeMillis();
- adjustment = VM.getNanoTimeAdjustment(offset);
- afterMillis = System.currentTimeMillis();
- if (adjustment == -1) {
- throw new RuntimeException(name + ": VM says " + offset
- + " secs is too far off, "
- + " when time in seconds is in ["
- + beforeMillis/MILLIS_IN_SECOND + ", "
- + afterMillis/MILLIS_IN_SECOND
- + "]");
- }
- }
- }
-
- Answer isOffLimit = isOffLimits(beforeMillis/MILLIS_IN_SECOND,
- afterMillis/MILLIS_IN_SECOND, offset);
- switch (isOffLimit) {
- case YES:
- if (adjustment != -1) {
- throw new RuntimeException(name
- + ": VM should have returned -1 for "
- + offset
- + " when time in seconds is in ["
- + beforeMillis/MILLIS_IN_SECOND + ", "
- + afterMillis/MILLIS_IN_SECOND + "]");
- }
- System.out.println("Got expected exception value: " + adjustment);
- break;
- case NO:
- if (adjustment == -1) {
- throw new RuntimeException(name
- + "VM says " + offset
- + " secs is too far off, "
- + " when time in seconds is in ["
- + beforeMillis/MILLIS_IN_SECOND + ", "
- + afterMillis/MILLIS_IN_SECOND
- + "]");
- }
- break;
- case MAYBE:
- System.out.println("Adjustment: " + adjustment);
- System.out.println("Can't assert for -1 with offset "
- + offset + "(" + name + ")"
- + " when time in seconds is in ["
- + beforeMillis/MILLIS_IN_SECOND + ", "
- + afterMillis/MILLIS_IN_SECOND
- + "]");
- // not conclusive
- }
-
- if (isOffLimit == Answer.NO || adjustment != -1) {
- System.out.println("Validating adjustment: " + adjustment);
- long expectedMax = distance(offset, beforeMillis/MILLIS_IN_SECOND)
- * NANOS_IN_SECOND
- + (beforeMillis % MILLIS_IN_SECOND) * NANOS_IN_MILLI
- + (afterMillis - beforeMillis + 1) * NANOS_IN_MILLI;
- long absoluteAdjustment = distance(0, adjustment);
- if (absoluteAdjustment > expectedMax) {
- long adjSec = absoluteAdjustment / NANOS_IN_SECOND;
- long adjMil = (absoluteAdjustment % NANOS_IN_SECOND) / NANOS_IN_MILLI;
- long adjMic = (absoluteAdjustment % NANOS_IN_MILLI) / NANOS_IN_MICRO;
- long adjNan = (absoluteAdjustment % NANOS_IN_MICRO);
- long expSec = expectedMax / NANOS_IN_SECOND;
- long expMil = (expectedMax % NANOS_IN_SECOND) / NANOS_IN_MILLI;
- long expMic = (expectedMax % NANOS_IN_MILLI) / NANOS_IN_MICRO;
- long expNan = (expectedMax % NANOS_IN_MICRO);
- System.err.println("Excessive adjustment: " + adjSec + "s, "
- + adjMil + "ms, " + adjMic + "mics, " + adjNan + "ns");
- System.err.println("Epected max: " + expSec + "s, "
- + expMil + "ms, " + expMic + "mics, " + expNan + "ns");
-
- throw new RuntimeException(name
- + ": Excessive adjustment: " + adjustment
- + " when time in millis is in ["
- + beforeMillis + ", " + afterMillis
- + "] and offset in seconds is " + offset);
- }
- }
-
- }
-
- static void regular() {
- System.out.println("*** Testing regular cases ***");
- final long start = System.currentTimeMillis();
- long offset = start/1000;
- long adjustment = VM.getNanoTimeAdjustment(offset);
- if (start != offset*1000) {
- if (adjustment == -1) {
- throw new RuntimeException("VM says " + offset
- + " secs is too far off, but time millis is "
- + System.currentTimeMillis());
- }
- }
- if (adjustment == -1) {
- offset = System.currentTimeMillis()/1000 - 1024;
- adjustment = VM.getNanoTimeAdjustment(offset);
- if (adjustment == -1) {
- throw new RuntimeException("VM says " + offset
- + " secs is too far off, but time millis is "
- + System.currentTimeMillis());
- }
- }
- if (adjustment > (start/1000 - offset + 20)*NANOS_IN_SECOND) {
- throw new RuntimeException("Excessive adjustment: " + adjustment);
- }
- testWithOffset("System.currentTimeMillis()/1000",
- System.currentTimeMillis()/1000);
- testWithOffset("System.currentTimeMillis()/1000 - 1024",
- System.currentTimeMillis()/1000 - 1024);
- testWithOffset("System.currentTimeMillis()/1000 + 1024",
- System.currentTimeMillis()/1000 + 1024);
- }
-
- static void testLimits() {
- System.out.println("*** Testing limits ***");
- testWithOffset("System.currentTimeMillis()/1000 - MAX_OFFSET + 1",
- System.currentTimeMillis()/1000 - MAX_OFFSET + 1);
- testWithOffset("System.currentTimeMillis()/1000 + MAX_OFFSET - 1",
- System.currentTimeMillis()/1000 + MAX_OFFSET - 1);
- testWithOffset("System.currentTimeMillis()/1000 - MAX_OFFSET",
- System.currentTimeMillis()/1000 - MAX_OFFSET);
- testWithOffset("System.currentTimeMillis()/1000 + MAX_OFFSET",
- System.currentTimeMillis()/1000 + MAX_OFFSET);
- testWithOffset("System.currentTimeMillis()/1000 - MAX_OFFSET - 1024",
- System.currentTimeMillis()/1000 - MAX_OFFSET - 1024);
- testWithOffset("System.currentTimeMillis()/1000 + MAX_OFFSET + 1024",
- System.currentTimeMillis()/1000 + MAX_OFFSET + 1024);
- testWithOffset("0", 0);
- testWithOffset("-1", -1);
- testWithOffset("Integer.MAX_VALUE + System.currentTimeMillis()/1000",
- ((long)Integer.MAX_VALUE) + System.currentTimeMillis()/1000);
- testWithOffset("System.currentTimeMillis()/1000 - Integer.MIN_VALUE",
- System.currentTimeMillis()/1000 - Integer.MIN_VALUE);
- testWithOffset("Long.MAX_VALUE", Long.MAX_VALUE);
- testWithOffset("System.currentTimeMillis()/1000 - Long.MIN_VALUE",
- (Long.MIN_VALUE + System.currentTimeMillis()/1000)*-1);
- }
-
- public static void main(String[] args) throws Exception {
- regular();
- testLimits();
- }
-
-}