org.cometd.benchmark.Atomics Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2016 the original author or authors.
*
* 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 org.cometd.benchmark;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicStampedReference;
public class Atomics {
public static void updateMin(AtomicLong currentMin, long newValue) {
long oldValue = currentMin.get();
while (newValue < oldValue) {
if (currentMin.compareAndSet(oldValue, newValue)) {
break;
}
oldValue = currentMin.get();
}
}
public static void updateMax(AtomicLong currentMax, long newValue) {
long oldValue = currentMax.get();
while (newValue > oldValue) {
if (currentMax.compareAndSet(oldValue, newValue)) {
break;
}
oldValue = currentMax.get();
}
}
public static void updateMin(AtomicInteger currentMin, int newValue) {
int oldValue = currentMin.get();
while (newValue < oldValue) {
if (currentMin.compareAndSet(oldValue, newValue)) {
break;
}
oldValue = currentMin.get();
}
}
public static void updateMax(AtomicInteger currentMax, int newValue) {
int oldValue = currentMax.get();
while (newValue > oldValue) {
if (currentMax.compareAndSet(oldValue, newValue)) {
break;
}
oldValue = currentMax.get();
}
}
public static int decrement(AtomicStampedReference reference) {
int oldStamp = reference.getStamp();
while (!reference.attemptStamp(reference.getReference(), oldStamp - 1)) {
oldStamp = reference.getStamp();
}
return oldStamp - 1;
}
public static boolean updateMax(AtomicStampedReference reference, T value, int stamp) {
int oldStamp = reference.getStamp();
while (stamp > oldStamp) {
if (reference.compareAndSet(reference.getReference(), value, oldStamp, stamp)) {
return true;
}
oldStamp = reference.getStamp();
}
return false;
}
}