| /* |
| * Copyright (c) 2013, 2016, 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. |
| */ |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.ThreadInfo; |
| import java.security.Permission; |
| import java.security.Policy; |
| import java.security.ProtectionDomain; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.atomic.AtomicLong; |
| import java.util.logging.LogManager; |
| import java.util.logging.Logger; |
| |
| |
| /** |
| * @test |
| * @bug 8029281 8027670 |
| * @summary Synchronization issues in Logger and LogManager. This test |
| * focusses more particularly on potential deadlock in |
| * drainLoggerRefQueueBounded / readConfiguration |
| * @modules java.logging |
| * java.management |
| * @run main/othervm TestLogConfigurationDeadLock |
| * @author danielfuchs |
| */ |
| // This test is a best effort to try & detect issues. The test itself will run |
| // for 8secs. This is usually unsufficient to detect issues. |
| // To get a greater confidence it is recommended to run this test in a loop: |
| // e.g. use something like: |
| // $ while jtreg -jdk:$JDK -verbose:all \ |
| // test/java/util/logging/TestLogConfigurationDeadLock.java ; \ |
| // do echo Running test again ; done |
| // and let it run for a few hours... |
| // |
| public class TestLogConfigurationDeadLock { |
| |
| static volatile Exception thrown = null; |
| static volatile boolean goOn = true; |
| |
| static final int READERS = 2; |
| static final int LOGGERS = 2; |
| static final long TIME = 4 * 1000; // 4 sec. |
| static final long STEP = 1 * 1000; // message every 1 sec. |
| static final int LCOUNT = 50; // 50 loggers created in a row... |
| static final AtomicLong nextLogger = new AtomicLong(0); |
| static final AtomicLong readCount = new AtomicLong(0); |
| static final AtomicLong checkCount = new AtomicLong(0); |
| |
| /** |
| * This test will run both with and without a security manager. |
| * |
| * The test starts a number of threads that will call |
| * LogManager.readConfiguration() concurrently (ReadConf), then starts |
| * a number of threads that will create new loggers concurrently |
| * (AddLogger), and then two additional threads: one (Stopper) that |
| * will stop the test after 4secs (TIME ms), and one DeadlockDetector |
| * that will attempt to detect deadlocks. |
| * If after 4secs no deadlock was detected and no exception was thrown |
| * then the test is considered a success and passes. |
| * |
| * This procedure is done twice: once without a security manager and once |
| * again with a security manager - which means the test takes ~8secs to |
| * run. |
| * |
| * Note that 8sec may not be enough to detect issues if there are some. |
| * This is a best effort test. |
| * |
| * @param args the command line arguments |
| */ |
| public static void main(String[] args) throws Exception { |
| |
| // test without security |
| System.out.println("No security"); |
| test(); |
| |
| // test with security |
| System.out.println("\nWith security"); |
| Policy.setPolicy(new Policy() { |
| @Override |
| public boolean implies(ProtectionDomain domain, Permission permission) { |
| if (super.implies(domain, permission)) return true; |
| // System.out.println("Granting " + permission); |
| return true; // all permissions |
| } |
| }); |
| System.setSecurityManager(new SecurityManager()); |
| test(); |
| } |
| |
| /** |
| * Starts all threads, wait 4secs, then stops all threads. |
| * @throws Exception if a deadlock was detected or an error occurred. |
| */ |
| public static void test() throws Exception { |
| goOn = true; |
| thrown = null; |
| long sNextLogger = nextLogger.get(); |
| long sReadCount = readCount.get(); |
| long sCheckCount = checkCount.get(); |
| List<Thread> threads = new ArrayList<>(); |
| for (int i = 0; i<READERS; i++) { |
| threads.add(new ReadConf()); |
| } |
| for (int i = 0; i<LOGGERS; i++) { |
| threads.add(new AddLogger()); |
| } |
| threads.add(new DeadlockDetector()); |
| threads.add(0, new Stopper(TIME)); |
| for (Thread t : threads) { |
| t.start(); |
| } |
| for (Thread t : threads) { |
| try { |
| t.join(); |
| } catch (Exception x) { |
| fail(x); |
| } |
| } |
| if (thrown != null) { |
| throw thrown; |
| } |
| System.out.println("Passed: " + (nextLogger.get() - sNextLogger) |
| + " loggers created by " + LOGGERS + " Thread(s),"); |
| System.out.println("\t LogManager.readConfiguration() called " |
| + (readCount.get() - sReadCount) + " times by " + READERS |
| + " Thread(s)."); |
| System.out.println("\t ThreadMXBean.findDeadlockedThreads called " |
| + (checkCount.get() -sCheckCount) + " times by 1 Thread."); |
| |
| } |
| |
| |
| static final class ReadConf extends Thread { |
| @Override |
| public void run() { |
| while (goOn) { |
| try { |
| LogManager.getLogManager().readConfiguration(); |
| readCount.incrementAndGet(); |
| Thread.sleep(1); |
| } catch (Exception x) { |
| fail(x); |
| } |
| } |
| } |
| } |
| |
| static final class AddLogger extends Thread { |
| @Override |
| public void run() { |
| try { |
| while (goOn) { |
| Logger l; |
| Logger foo = Logger.getLogger("foo"); |
| Logger bar = Logger.getLogger("foo.bar"); |
| for (int i=0; i < LCOUNT ; i++) { |
| l = Logger.getLogger("foo.bar.l"+nextLogger.incrementAndGet()); |
| l.fine("I'm fine"); |
| if (!goOn) break; |
| Thread.sleep(1); |
| } |
| } |
| } catch (InterruptedException | RuntimeException x ) { |
| fail(x); |
| } |
| } |
| } |
| |
| static final class DeadlockDetector extends Thread { |
| |
| @Override |
| public void run() { |
| while(goOn) { |
| try { |
| long[] ids = ManagementFactory.getThreadMXBean().findDeadlockedThreads(); |
| checkCount.incrementAndGet(); |
| ids = ids == null ? new long[0] : ids; |
| if (ids.length == 1) { |
| throw new RuntimeException("Found 1 deadlocked thread: "+ids[0]); |
| } else if (ids.length > 0) { |
| ThreadInfo[] infos = ManagementFactory.getThreadMXBean() |
| .getThreadInfo(ids, Integer.MAX_VALUE); |
| System.err.println("Found "+ids.length+" deadlocked threads: "); |
| for (ThreadInfo inf : infos) { |
| System.err.println(inf.toString()); |
| } |
| throw new RuntimeException("Found "+ids.length+" deadlocked threads"); |
| } |
| Thread.sleep(100); |
| } catch(InterruptedException | RuntimeException x) { |
| fail(x); |
| } |
| } |
| } |
| |
| } |
| |
| static final class Stopper extends Thread { |
| long start; |
| long time; |
| |
| Stopper(long time) { |
| start = System.currentTimeMillis(); |
| this.time = time; |
| } |
| |
| @Override |
| public void run() { |
| try { |
| long rest, previous; |
| previous = time; |
| while (goOn && (rest = start - System.currentTimeMillis() + time) > 0) { |
| if (previous == time || previous - rest >= STEP) { |
| Logger.getLogger("remaining").info(String.valueOf(rest)+"ms remaining..."); |
| previous = rest == time ? rest -1 : rest; |
| System.gc(); |
| } |
| if (goOn == false) break; |
| Thread.sleep(Math.min(rest, 100)); |
| } |
| System.out.println(System.currentTimeMillis() - start |
| + " ms elapsed ("+time+ " requested)"); |
| goOn = false; |
| } catch(InterruptedException | RuntimeException x) { |
| fail(x); |
| } |
| } |
| |
| } |
| |
| static void fail(Exception x) { |
| x.printStackTrace(); |
| if (thrown == null) { |
| thrown = x; |
| } |
| goOn = false; |
| } |
| } |