132 lines
4.3 KiB
Java
132 lines
4.3 KiB
Java
/*
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* Copyright (c) 2003, 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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package nsk.jvmti.GetObjectMonitorUsage;
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import nsk.share.Wicket;
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import java.io.PrintStream;
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public class objmonusage006 {
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final static int JCK_STATUS_BASE = 95;
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final static int WAIT_TIME = 100;
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final static int N_LATE_CHECKS = 1000;
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final static int N_THREADS = 10;
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static {
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try {
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System.loadLibrary("objmonusage006");
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} catch (UnsatisfiedLinkError ule) {
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System.err.println("Could not load objmonusage006 library");
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System.err.println("java.library.path:"
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+ System.getProperty("java.library.path"));
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throw ule;
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}
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}
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public static Wicket startingBarrier;
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static Object lockCheck = new Object();
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native static void check(Object obj);
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native static int getRes();
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public static void main(String args[]) {
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args = nsk.share.jvmti.JVMTITest.commonInit(args);
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// produce JCK-like exit status.
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System.exit(run(args, System.out) + JCK_STATUS_BASE);
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}
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public static int run(String args[], PrintStream out) {
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int res = -1;
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for (int i = 0; i < N_THREADS; i++) {
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System.out.println("Starting LockingThread #" + i + ".");
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// Original objmonusage005 test block starts here:
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//
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LockingThread thr = new LockingThread();
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startingBarrier = new Wicket();
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thr.start();
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startingBarrier.waitFor();
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check(lockCheck);
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thr.letItGo();
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//
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// Original objmonusage005 test block ends here.
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res = getRes();
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if (res != 0) {
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return res;
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}
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// The worker thread is free to exit after the letItGo()
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// call above. This loop stresses the use of JVM/TI
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// GetObjectMonitorUsage() at thread exit time.
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synchronized (lockCheck) {
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// lockCheck needs to be locked for JVM/TI
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// GetObjectMonitorUsage() to cover the right
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// code paths.
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System.out.println("LockingThread #" + i + " starting "
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+ N_LATE_CHECKS + " late checks.");
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for (int j = 0; j < N_LATE_CHECKS; j++) {
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check(lockCheck);
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res = getRes();
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if (res != 0) {
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return res;
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}
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}
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System.out.println("LockingThread #" + i + " ran "
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+ N_LATE_CHECKS + " late checks.");
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}
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}
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return res;
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}
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static class LockingThread extends Thread {
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private volatile boolean flag = true;
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public synchronized void run() {
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synchronized (lockCheck) {
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startingBarrier.unlock();
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int i = 0;
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int n = 1000;
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while (flag) {
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if (n <= 0) {
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n = 1000;
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}
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if (i > n) {
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i = 0;
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n--;
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}
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i++;
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}
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}
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}
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public void letItGo() {
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flag = false;
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}
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}
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}
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