201 lines
8.1 KiB
Java
201 lines
8.1 KiB
Java
/*
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* Copyright (c) 2003, 2024, 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 java.io.PrintStream;
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public class objmonusage001 {
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final static int JCK_STATUS_BASE = 95;
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final static int NUMBER_OF_THREADS = 32;
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final static boolean ADD_DELAYS_FOR_RACES = false;
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static {
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try {
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System.loadLibrary("objmonusage001");
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} catch (UnsatisfiedLinkError err) {
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System.err.println("Could not load objmonusage001 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 err;
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}
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}
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native static int getResult();
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native static void check(int index, Object syncObject, Thread owner, int entryCount,
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Thread waiterThread, int waiterCount,
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Thread notifyWaiterThread, int notifyWaiterCount);
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public static void main(String argv[]) {
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argv = nsk.share.jvmti.JVMTITest.commonInit(argv);
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System.exit(run(argv, System.out) + JCK_STATUS_BASE);
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}
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public static int run(String argv[], PrintStream out) {
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Thread mainThread = Thread.currentThread();
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Object syncObject[] = new Object[NUMBER_OF_THREADS];
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objmonusage001a runn[] = new objmonusage001a[NUMBER_OF_THREADS];
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for (int i = 0; i < NUMBER_OF_THREADS; i++) {
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syncObject[i] = new Object();
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runn[i] = new objmonusage001a(mainThread, i, syncObject[i]);
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}
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// Virtual threads are not supported by GetObjectMonitorUsage.
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// Correct the expected values if the test is executed with
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// JTREG="TEST_THREAD_FACTORY=Virtual".
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Thread expOwner = mainThread.isVirtual() ? null : mainThread;
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int expEntryCount = mainThread.isVirtual() ? 0 : 1;
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for (int i = 0; i < NUMBER_OF_THREADS; i++) {
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Thread expNotifyWaiter = runn[i].isVirtual() ? null : runn[i];
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int expNotifyWaitingCount = runn[i].isVirtual() ? 0 : 1;
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synchronized (syncObject[i]) {
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runn[i].start();
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try {
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syncObject[i].wait();
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} catch (Throwable e) {
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out.println(e);
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return 2;
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}
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// Check #2:
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// - owner == main:
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// main thread owns the monitor and worker thread
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// is in wait() and is not notified
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// - entry_count == 1:
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// main thread reentered 1 time
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// - waiter_count == 0:
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// main thread has already reentered the monitor and worker thread
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// is in wait() and is not notified so it is not waiting to reenter
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// the monitor
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// - waiter_thread == null:
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// no thread is waiting to reenter the monitor
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// - notify_waiter_count == 1:
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// worker thread is in wait() and is not notified
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// - notify_waiter_thread == runn[i]:
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// worker thread is in wait() and is not notified
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//
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// This is a stable verification point because the worker thread is in wait()
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// and is not notified and the main thread is doing the verification.
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//
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check(NUMBER_OF_THREADS + i, syncObject[i], expOwner, expEntryCount,
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null, 0, expNotifyWaiter, expNotifyWaitingCount);
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}
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// Check #3:
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// - owner == null:
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// main thread does not own the monitor and worker thread is in
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// wait() and is not notified so there is no owner
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// - entry_count == 0:
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// no owner so entry_count is 0
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// - waiter_count == 0:
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// main thread is not trying to enter the monitor and worker thread
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// is in wait() and is not notified so it is not waiting to reenter
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// the monitor
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// - waiter_thread == null:
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// no thread is waiting to reenter the monitor
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// - notify_waiter_count == 1:
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// worker thread is in wait() and is not notified
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// - notify_waiter_thread == runn[i]:
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// worker thread is in wait() and is not notified
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//
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// This is a stable verification point because the worker thread is in wait()
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// and is not notified and the main thread is doing the verification.
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//
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check((NUMBER_OF_THREADS * 2) + i, syncObject[i], null, 0,
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null, 0, expNotifyWaiter, expNotifyWaitingCount);
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}
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for (int i = 0; i < NUMBER_OF_THREADS; i++) {
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synchronized (syncObject[i]) {
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syncObject[i].notify();
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}
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try {
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runn[i].join();
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} catch (InterruptedException e) {
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throw new Error("Unexpected " + e);
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}
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}
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return getResult();
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}
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}
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class objmonusage001a extends Thread {
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Thread mainThread;
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Object syncObject;
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int index;
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public objmonusage001a(Thread mt, int i, Object s) {
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mainThread = mt;
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index = i;
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syncObject = s;
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}
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public void run() {
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// Virtual threads are not supported by GetObjectMonitorUsage.
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// Correct the expected values if the test is executed with
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// JTREG="TEST_THREAD_FACTORY=Virtual".
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Thread expOwner = this.isVirtual() ? null : this;
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Thread expNotifyWaiter = mainThread.isVirtual() ? null : mainThread;
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int expEntryCount = this.isVirtual() ? 0 : 1;
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int expNotifyWaitingCount = mainThread.isVirtual() ? 0 : 1;
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synchronized (syncObject) {
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// Check #1:
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// - owner == this_thread:
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// this worker thread is owner
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// - entry_count == 1:
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// worker thread entered 1 time
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// - waiter_count == 0:
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// main thread is in wait() and is not notified so it is not
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// waiting to reenter the monitor
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// - waiter_thread == null:
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// no thread is waiting to reenter the monitor
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// - notify_waiter_count == 1:
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// main thread is in wait() and is not notified
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// - notify_waiter_thread == mainThread:
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// main thread is in wait() and is not notified
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//
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// This is a stable verification point because the main thread is in wait()
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// and is not notified and this worker thread is doing the verification.
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//
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objmonusage001.check(index, syncObject, expOwner, expEntryCount,
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null, 0, expNotifyWaiter, expNotifyWaitingCount);
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syncObject.notify();
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try {
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syncObject.wait();
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if (objmonusage001.ADD_DELAYS_FOR_RACES) {
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Thread.sleep(1000);
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}
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} catch (InterruptedException e) {
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throw new Error("Unexpected " + e);
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}
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}
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}
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}
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