--- /dev/null Wed Nov 8 09:07:21 2017 +++ new/test/hotspot/jtreg/runtime/Thread/ResumeAtExit.java Wed Nov 8 09:07:20 2017 @@ -0,0 +1,107 @@ +/* + * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +/** + * @test + * @bug 8167108 + * @summary Stress test java.lang.Thread.resume() at thread exit. + * @run main/othervm -Xlog:thread+smr=debug ResumeAtExit + */ + +import java.util.concurrent.CountDownLatch; + +public class ResumeAtExit extends Thread { + final static int N_THREADS = 32; + final static int N_LATE_CALLS = 2000; + + public CountDownLatch exitSyncObj = new CountDownLatch(1); + public CountDownLatch startSyncObj = new CountDownLatch(1); + + @Override + public void run() { + // Tell main thread we have started. + startSyncObj.countDown(); + try { + // Wait for main thread to interrupt us so we + // can race to exit. + exitSyncObj.await(); + } catch (InterruptedException e) { + // ignore because we expect one + } + } + + public static void main(String[] args) { + ResumeAtExit threads[] = new ResumeAtExit[N_THREADS]; + + for (int i = 0; i < N_THREADS; i++ ) { + threads[i] = new ResumeAtExit(); + int late_count = 1; + threads[i].start(); + try { + // Wait for the worker thread to get going. + threads[i].startSyncObj.await(); + + // This interrupt() call will break the worker out + // of the exitSyncObj.await() call and the resume() + // calls will come in during thread exit. + threads[i].interrupt(); + for (; late_count <= N_LATE_CALLS; late_count++) { + threads[i].resume(); + + if (!threads[i].isAlive()) { + // Done with Thread.resume() calls since + // thread is not alive. + break; + } + } + } catch (InterruptedException e) { + throw new Error("Unexpected: " + e); + } + + System.out.println("INFO: thread #" + i + ": made " + late_count + + " late calls to java.lang.Thread.resume()"); + System.out.println("INFO: thread #" + i + ": N_LATE_CALLS==" + + N_LATE_CALLS + " value is " + + ((late_count >= N_LATE_CALLS) ? "NOT " : "") + + "large enough to cause a Thread.resume() " + + "call after thread exit."); + + try { + threads[i].join(); + } catch (InterruptedException e) { + throw new Error("Unexpected: " + e); + } + threads[i].resume(); + if (threads[i].isAlive()) { + throw new Error("Expected !Thread.isAlive() after thread #" + + i + " has been join()'ed"); + } + } + + String cmd = System.getProperty("sun.java.command"); + if (cmd != null && !cmd.startsWith("com.sun.javatest.regtest.agent.MainWrapper")) { + // Exit with success in a non-JavaTest environment: + System.exit(0); + } + } +}