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/*
* Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package nsk.jvmti.GetObjectMonitorUsage;
import java.io.PrintStream;
public class objmonusage004 {
final static int JCK_STATUS_BASE = 95;
final static int NUMBER_OF_THREADS = 16;
final static int WAIT_TIME = 100;
static {
try {
System.loadLibrary("objmonusage004");
} catch (UnsatisfiedLinkError ule) {
System.err.println("Could not load objmonusage004 library");
System.err.println("java.library.path:"
+ System.getProperty("java.library.path"));
throw ule;
}
}
static Object lockStart = new Object();
static Object lockCheck = new Object();
native static int getRes();
native static void check(Object obj, Thread owner,
int entryCount, int waiterCount);
public static void main(String args[]) {
args = nsk.share.jvmti.JVMTITest.commonInit(args);
// produce JCK-like exit status.
System.exit(run(args, System.out) + JCK_STATUS_BASE);
}
public static int run(String args[], PrintStream out) {
Thread currThread = Thread.currentThread();
ContendThread thr[] = new ContendThread[NUMBER_OF_THREADS];
synchronized (lockCheck) {
// Virtual threads are not supported by GetObjectMonitorUsage.
// Correct the expected values if the test is executed with
// JTREG="TEST_THREAD_FACTORY=Virtual".
Thread expOwner = currThread.isVirtual() ? null : currThread;
int expEntryCount = currThread.isVirtual() ? 0 : 2;
synchronized (lockCheck) {
check(lockCheck, expOwner, expEntryCount, 0);
}
expEntryCount = currThread.isVirtual() ? 0 : 1;
int expWaiterCount = 0;
for (int i = 0; i < NUMBER_OF_THREADS; i++) {
thr[i] = new ContendThread();
if (!thr[i].isVirtual()) {
expWaiterCount++;
}
synchronized (lockStart) {
thr[i].start();
try {
lockStart.wait();
lockStart.wait(WAIT_TIME);
} catch (InterruptedException e) {
throw new Error("Unexpected " + e);
}
}
check(lockCheck, expOwner, expEntryCount, expWaiterCount);
}
}
for (int i = 0; i < NUMBER_OF_THREADS; i++) {
try {
thr[i].join();
} catch (InterruptedException e) {
throw new Error("Unexpected " + e);
}
}
check(lockCheck, null, 0, 0);
return getRes();
}
static class ContendThread extends Thread {
public synchronized void run() {
synchronized (lockStart) {
lockStart.notify();
}
synchronized (lockCheck) {
lockCheck.notify();
}
}
}
}
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