リオーダーテスト

ReOrderingTest.java

package test;

import java.util.concurrent.CountDownLatch;

public class ReOrderingTest {
	static int x = 0;
	static int y = 0;
	static int a = 0;
	static int b = 0;

	static CountDownLatch startLatch;

	public static void main(String[] args) throws InterruptedException {
		for (int i = 0; i < 1000000; i++) {
			x = 0;
			y = 0;
			a = 0;
			b = 0;
			startLatch = new CountDownLatch(1);
			Thread aThread = new Thread(new Runnable() { // スレッドA
						@Override
						public void run() {
							try {
								startLatch.await();
							} catch (InterruptedException e) {
								Thread.currentThread().interrupt();
							}
							a = 1;
							x = b;
						}
					});
			Thread bThread = new Thread(new Runnable() { // スレッドB
						@Override
						public void run() {
							try {
								startLatch.await();
							} catch (InterruptedException e) {
								Thread.currentThread().interrupt();
							}
							b = 1;
							y = a;
						}
					});
			aThread.start();
			bThread.start();
			try {
				startLatch.countDown();
				aThread.join();
				bThread.join();
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
			System.out.println(i + " (" + x + " , " + y + ")");
		}
	}
}