122 lines
4.5 KiB
Java
122 lines
4.5 KiB
Java
/*
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* Copyright (c) 2022, Oracle and/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 8284161 8287103
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* @summary Test ThredMXBean.findMonitorDeadlockedThreads with cycles of
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* platform and virtual threads in deadlock
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* @enablePreview
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* @modules java.management
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* @run main/othervm VirtualThreadDeadlocks PP
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* @run main/othervm VirtualThreadDeadlocks PV
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* @run main/othervm VirtualThreadDeadlocks VV
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*/
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/**
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* @test
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* @requires vm.continuations
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* @enablePreview
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* @modules java.management
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* @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:-VMContinuations VirtualThreadDeadlocks PP
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* @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:-VMContinuations VirtualThreadDeadlocks PV
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* @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:-VMContinuations VirtualThreadDeadlocks VV
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*/
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import java.lang.management.ManagementFactory;
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import java.lang.management.ThreadMXBean;
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import java.util.Arrays;
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import java.util.concurrent.CyclicBarrier;
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import java.util.stream.Stream;
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public class VirtualThreadDeadlocks {
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private static final Object LOCK1 = new Object();
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private static final Object LOCK2 = new Object();
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private static final CyclicBarrier barrier = new CyclicBarrier(2);
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/**
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* PP = test deadlock with two platform threads
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* PV = test deadlock with one platform thread and one virtual thread
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* VV = test deadlock with two virtual threads
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*/
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public static void main(String[] args) throws Exception {
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// start thread1
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Thread.Builder builder1 = (args[0].charAt(0) == 'P')
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? Thread.ofPlatform().daemon()
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: Thread.ofVirtual();
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Thread thread1 = builder1.start(() -> {
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synchronized (LOCK1) {
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try { barrier.await(); } catch (Exception ie) {}
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synchronized (LOCK2) { }
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}
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});
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System.out.println("thread1 => " + thread1);
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// start thread2
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Thread.Builder builder2 = (args[0].charAt(1) == 'P')
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? Thread.ofPlatform().daemon()
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: Thread.ofVirtual();
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Thread thread2 = builder2.start(() -> {
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synchronized (LOCK2) {
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try { barrier.await(); } catch (Exception ie) {}
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synchronized (LOCK1) { }
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}
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});
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System.out.println("thread2 => " + thread2);
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System.out.println("Waiting for thread1 and thread2 to deadlock ...");
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awaitBlocked(thread1);
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awaitBlocked(thread2);
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ThreadMXBean bean = ManagementFactory.getPlatformMXBean(ThreadMXBean.class);
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long[] deadlockedThreads = sorted(bean.findMonitorDeadlockedThreads());
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System.out.println("findMonitorDeadlockedThreads => " + Arrays.toString(deadlockedThreads));
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// deadlocks involving virtual threads are not detected
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long[] expectedThreads = (!thread1.isVirtual() && !thread2.isVirtual())
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? sorted(thread1.threadId(), thread2.threadId())
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: null;
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System.out.println("expected => " + Arrays.toString(expectedThreads));
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if (!Arrays.equals(deadlockedThreads, expectedThreads))
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throw new RuntimeException("Unexpected result");
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}
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private static void awaitBlocked(Thread thread) throws InterruptedException {
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while (thread.getState() != Thread.State.BLOCKED) {
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Thread.sleep(10);
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if (!thread.isAlive()) {
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throw new RuntimeException("Thread " + thread + " is terminated.");
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}
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}
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}
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private static long[] sorted(long... array) {
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if (array != null) Arrays.sort(array);
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return array;
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}
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}
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