4ea1b99c1a
Co-authored-by: Patricio Chilano Mateo <pchilanomate@openjdk.org> Reviewed-by: stuefe, pchilanomate, rkennke, mli
94 lines
3.0 KiB
Java
94 lines
3.0 KiB
Java
/*
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* Copyright (c) 2023, 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
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* @bug 8317262
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* @library /testlibrary /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+HandshakeALot -XX:GuaranteedSafepointInterval=1 TestStackWalk
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*/
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import jvmti.JVMTIUtils;
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import jdk.test.lib.Asserts;
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import jdk.test.whitebox.WhiteBox;
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import java.util.concurrent.CountDownLatch;
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public class TestStackWalk {
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static Thread worker1;
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static Thread worker2;
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static volatile boolean done;
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static volatile int counter = 0;
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static Object lock = new Object();
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public static void main(String... args) throws Exception {
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worker1 = new Thread(() -> syncedWorker());
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worker1.start();
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worker2 = new Thread(() -> syncedWorker());
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worker2.start();
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Thread worker3 = new Thread(() -> stackWalker());
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worker3.start();
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worker1.join();
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worker2.join();
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worker3.join();
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}
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public static void syncedWorker() {
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synchronized (lock) {
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while (!done) {
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counter++;
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}
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}
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}
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public static void stackWalker() {
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// Suspend workers so the one looping waiting for "done"
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// doesn't execute the handshake below, increasing the
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// chances the VMThread will do it.
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suspendWorkers();
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WhiteBox wb = WhiteBox.getWhiteBox();
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long end = System.currentTimeMillis() + 20000;
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while (end > System.currentTimeMillis()) {
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wb.handshakeWalkStack(worker1, false /* all_threads */);
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wb.handshakeWalkStack(worker2, false /* all_threads */);
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}
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resumeWorkers();
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done = true;
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}
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static void suspendWorkers() {
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JVMTIUtils.suspendThread(worker1);
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JVMTIUtils.suspendThread(worker2);
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}
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static void resumeWorkers() {
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JVMTIUtils.resumeThread(worker1);
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JVMTIUtils.resumeThread(worker2);
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}
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}
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