test/hotspot/jtreg/runtime/handshake/HandshakeWalkSuspendExitTest.java
author rehn
Wed, 31 Oct 2018 08:09:45 +0100
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permissions -rw-r--r--
8212933: Thread-SMR: requesting a VM operation whilst holding a ThreadsListHandle can cause deadlocks Reviewed-by: eosterlund, dcubed, sspitsyn, dholmes
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/*
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 * Copyright (c) 2018, 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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/*
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 * @test HandshakeWalkSuspendExitTest
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 * @summary This test tries to stress the handshakes with new and exiting threads while suspending them.
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 * @library /testlibrary /test/lib
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 * @build HandshakeWalkSuspendExitTest
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 * @run driver ClassFileInstaller sun.hotspot.WhiteBox
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 *                              sun.hotspot.WhiteBox$WhiteBoxPermission
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 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI HandshakeWalkSuspendExitTest
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 */
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import jdk.test.lib.Asserts;
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import sun.hotspot.WhiteBox;
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public class HandshakeWalkSuspendExitTest  implements Runnable {
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    static final int _test_threads = 8;
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    static final int _test_exit_threads = 128;
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    static Thread[] _threads = new Thread[_test_threads];
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    static volatile boolean exit_now = false;
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    static java.util.concurrent.Semaphore _sem = new java.util.concurrent.Semaphore(0);
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    @Override
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    public void run() {
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        WhiteBox wb = WhiteBox.getWhiteBox();
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        while (!exit_now) {
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            _sem.release();
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            // We only suspend threads on even index and not ourself.
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            // Otherwise we can accidentially suspend all threads.
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            for (int i = 0; i < _threads.length; i += 2) {
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                wb.handshakeWalkStack(null /* ignored */, true /* stackwalk all threads */);
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                if (Thread.currentThread() != _threads[i]) {
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                    _threads[i].suspend();
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                    _threads[i].resume();
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                }
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            }
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            for (int i = 0; i < _threads.length; i += 2) {
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                wb.handshakeWalkStack(_threads[i] /* thread to stackwalk */, false /* stackwalk one thread */);
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                if (Thread.currentThread() != _threads[i]) {
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                    _threads[i].suspend();
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                    _threads[i].resume();
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                }
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            }
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        }
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    }
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    public static void main(String... args) throws Exception {
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        HandshakeWalkSuspendExitTest test = new HandshakeWalkSuspendExitTest();
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        for (int i = 0; i < _threads.length; i++) {
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            _threads[i] = new Thread(test);
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            _threads[i].start();
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        }
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        for (int i = 0; i < _test_threads; i++) {
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            _sem.acquire();
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        }
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        Thread[] exit_threads = new Thread[_test_exit_threads];
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        for (int i = 0; i < _test_exit_threads; i++) {
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            exit_threads[i] = new Thread(new Runnable() { public void run() {} });
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            exit_threads[i].start();
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        }
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        exit_now = true;
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        for (int i = 0; i < _threads.length; i++) {
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            _threads[i].join();
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        }
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        for (int i = 0; i < exit_threads.length; i++) {
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            exit_threads[i].join();
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        }
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    }
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}