115 lines
3.4 KiB
Java
115 lines
3.4 KiB
Java
/*
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* Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8305425
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* @summary Check Thread.isAlive
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* @run main/othervm IsAlive
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*/
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public class IsAlive {
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static boolean spinnerDone;
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private static void spin() {
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try {
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while (!Thread.currentThread().isInterrupted()) {
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Thread.sleep(100);
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}
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} catch (InterruptedException ie) {
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// Do nothing, just exit
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}
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spinnerDone = true;
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}
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static volatile boolean checkerReady;
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private static void check(Thread t) {
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while (!t.isAlive()) {
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// Burn hard, without any sleeps.
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// Check that we discover the thread is alive eventually.
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}
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checkerReady = true;
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while (t.isAlive()) {
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// Burn hard, without any sleeps.
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// Check that we discover the thread is not alive eventually.
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}
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if (!spinnerDone) {
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throw new RuntimeException("Last write of terminated thread was not seen!");
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}
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}
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private static void assertAlive(Thread t) {
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if (!t.isAlive()) {
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throw new IllegalStateException("Thread " + t + " is not alive, but it should be");
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}
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}
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private static void assertNotAlive(Thread t) {
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if (t.isAlive()) {
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throw new IllegalStateException("Thread " + t + " is alive, but it should not be");
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}
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}
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public static void main(String args[]) throws Exception {
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Thread spinner = new Thread(IsAlive::spin);
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spinner.setName("Spinner");
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spinner.setDaemon(true);
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Thread checker = new Thread(() -> check(spinner));
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checker.setName("Checker");
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checker.setDaemon(true);
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assertNotAlive(spinner);
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assertNotAlive(checker);
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System.out.println("Starting spinner");
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spinner.start();
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assertAlive(spinner);
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System.out.println("Starting checker");
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checker.start();
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assertAlive(checker);
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System.out.println("Waiting for checker to catch up");
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while (!checkerReady) {
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Thread.sleep(100);
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}
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System.out.println("Interrupting and joining spinner");
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spinner.interrupt();
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spinner.join();
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assertNotAlive(spinner);
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System.out.println("Joining checker");
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checker.join();
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assertNotAlive(checker);
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System.out.println("Complete");
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}
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}
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