137 lines
5.1 KiB
Java
137 lines
5.1 KiB
Java
/*
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* Copyright (c) 2020, 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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/*
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* @test HandshakeDirectTest
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* @bug 8240918
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* @summary This test tries to stress direct handshakes between threads while suspending them.
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* @library /testlibrary /test/lib
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* @build HandshakeDirectTest
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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 HandshakeDirectTest
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:GuaranteedSafepointInterval=10 -XX:+HandshakeALot -XX:+SafepointALot HandshakeDirectTest
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*/
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import jvmti.JVMTIUtils;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.concurrent.ThreadLocalRandom;
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import java.util.concurrent.Semaphore;
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import jdk.test.whitebox.WhiteBox;
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import java.io.*;
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public class HandshakeDirectTest implements Runnable {
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static final int WORKING_THREADS = 32;
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static final int DIRECT_HANDSHAKES_MARK = 300000;
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static Thread[] workingThreads = new Thread[WORKING_THREADS];
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static Object[] locks = new Object[WORKING_THREADS];
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static AtomicInteger handshakeCount = new AtomicInteger(0);
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static void suspendThread(Thread t) {
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try {
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JVMTIUtils.suspendThread(t);
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} catch (JVMTIUtils.JvmtiException e) {
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if (e.getCode() != JVMTIUtils.JVMTI_ERROR_THREAD_NOT_ALIVE
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&& e.getCode() != JVMTIUtils.JVMTI_ERROR_WRONG_PHASE) {
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throw e;
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}
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}
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}
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static void resumeThread(Thread t) {
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try {
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JVMTIUtils.resumeThread(t);
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} catch (JVMTIUtils.JvmtiException e) {
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if (e.getCode() != JVMTIUtils.JVMTI_ERROR_THREAD_NOT_ALIVE
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&& e.getCode() != JVMTIUtils.JVMTI_ERROR_WRONG_PHASE) {
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throw e;
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}
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}
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}
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@Override
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public void run() {
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int me = Integer.parseInt(Thread.currentThread().getName());
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WhiteBox wb = WhiteBox.getWhiteBox();
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while (handshakeCount.get() < DIRECT_HANDSHAKES_MARK) {
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boolean walked = false;
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synchronized(locks[me]) {
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// Handshake directly some other worker
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int handshakee = ThreadLocalRandom.current().nextInt(0, WORKING_THREADS - 1);
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if (handshakee == me) {
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// Pick another thread instead of me.
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handshakee = handshakee != 0 ? handshakee - 1 : handshakee + 1;
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}
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// Inflate locks[handshakee] if possible
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System.identityHashCode(locks[handshakee]);
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walked = wb.handshakeReadMonitors(workingThreads[handshakee]);
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if (walked) {
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handshakeCount.incrementAndGet();
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}
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}
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locks[me] = new Object();
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}
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}
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public static void main(String... args) throws Exception {
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HandshakeDirectTest test = new HandshakeDirectTest();
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// Initialize locks
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for (int i = 0; i < WORKING_THREADS; i++) {
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locks[i] = new Object();
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}
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// Fire-up working threads.
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for (int i = 0; i < WORKING_THREADS; i++) {
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workingThreads[i] = new Thread(test, Integer.toString(i));
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workingThreads[i].start();
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}
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// Fire-up suspend-resume thread
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Thread suspendResumeThread = new Thread() {
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@Override
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public void run() {
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while (true) {
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int i = ThreadLocalRandom.current().nextInt(0, WORKING_THREADS - 1);
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suspendThread(workingThreads[i]);
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try {
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Thread.sleep(1); // sleep for 1 ms
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} catch(InterruptedException ie) {
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}
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resumeThread(workingThreads[i]);
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}
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}
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};
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suspendResumeThread.setDaemon(true);
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suspendResumeThread.start();
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// Wait until the desired number of direct handshakes is reached
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// and check that all workers exited
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for (int i = 0; i < WORKING_THREADS; i++) {
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workingThreads[i].join();
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}
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}
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}
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