drlvm/src/test/regression/H4706/ThreadArrayInterrupt.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.apache.harmony.drlvm.tests.regression.h4706;

/**
 * Checks that interruption of several threads doesn't cause VM crash due to
 * race condition in thread manager implementation for thread interrupting.
 * First main thread creates and starts a number of test threads.
 * Second main thead interrupts all of the test threads.
 * Each of the test threads waits on the same monitor.
 */
public class ThreadArrayInterrupt {

    static final int threadNum = 32;
    static Object barrier = new Object();

    public static void main(String[] args) {
        Thread[] threads = new Thread[threadNum];

        synchronized (barrier) {
            System.out.println("starting threads...");

            for (int i = 0; i < threadNum; i++) {
                threads[i] = new TestThread("Thread-" + i);
                threads[i].start();
            }

            System.out.println("all threads started");
        }

        System.out.println("Interrupting all threads...");

        for (int i = 0; i < threadNum; i++) {
            threads[i].interrupt();
        }
    }

    static class TestThread extends Thread {

        TestThread(String name) {
            super(name);
        }

        public void run() {
            synchronized (barrier) {
                try {
                    barrier.wait();
                } catch (InterruptedException e) {
                    System.out.println("Interrupted: " + getName());
                }
            }
        }
    }
}