/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Eclipse Public License (EPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/eclipse-1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.mmtk.harness.vm;
import org.vmmagic.pragma.Uninterruptible;
/**
* A counter that supports atomic increment and reset.
*/
@Uninterruptible
public class SynchronizedCounter extends org.mmtk.vm.SynchronizedCounter {
/** The current value of the counter */
private int value;
/**
* Reset the counter to 0, returning its previous value.
*
* @return The value of the counter, prior to reset.
*/
public synchronized int reset() {
int old = value;
value = 0;
return old;
}
/**
* Adds 1 to the counter.
*
* @return the value before the add
*/
public synchronized int increment() {
return value++;
}
/**
* Peek at the counter
*
* @return The current value of the counter.
*/
public int peek() {
return value;
}
}