/*
* Copyright (c) 2012 Aleksey Shipilev
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.shipilev.concurrent.torture.tests.primitiveAtomicity;
import net.shipilev.concurrent.torture.tests.OneActorOneObserverTest;
/**
* Tests if volatile primitive doubles experience non-atomic updates.
*
* @author Aleksey Shipilev (aleksey.shipilev@oracle.com)
*/
public class VolatileDoubleAtomicityTest implements OneActorOneObserverTest<VolatileDoubleAtomicityTest.Specimen> {
public static class Specimen {
volatile double x;
}
@Override
public Specimen newState() {
return new Specimen();
}
@Override
public void actor1(Specimen s) {
s.x = Double.longBitsToDouble(0xFFFFFFFFFFFFFFFFL);
}
@Override
public void observe(Specimen s, byte[] result) {
long t = Double.doubleToRawLongBits(s.x);
result[0] = (byte) ((t >> 0) & 0xFF);
result[1] = (byte) ((t >> 8) & 0xFF);
result[2] = (byte) ((t >> 16) & 0xFF);
result[3] = (byte) ((t >> 24) & 0xFF);
result[4] = (byte) ((t >> 32) & 0xFF);
result[5] = (byte) ((t >> 40) & 0xFF);
result[6] = (byte) ((t >> 48) & 0xFF);
result[7] = (byte) ((t >> 56) & 0xFF);
}
@Override
public int resultSize() {
return 8;
}
}