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/*
* Copyright (c) 2003, 2021, 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 nsk.share.Wicket;
import java.io.PrintStream;
public class objmonusage006 {
private final static String AGENT_LIB = "objmonusage006";
private final static int DEF_TIME_MAX = 30; // default max # secs to test
final static int JCK_STATUS_BASE = 95;
final static int WAIT_TIME = 100;
static {
try {
System.loadLibrary(AGENT_LIB);
} catch (UnsatisfiedLinkError ule) {
System.err.println("Could not load " + AGENT_LIB + " library");
System.err.println("java.library.path:"
+ System.getProperty("java.library.path"));
throw ule;
}
}
public static Wicket startingBarrier;
static Object lockCheck = new Object();
native static void check(Object obj);
native static int getRes();
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) {
int timeMax = 0;
if (args.length == 0) {
timeMax = DEF_TIME_MAX;
} else {
try {
timeMax = Integer.parseUnsignedInt(args[0]);
} catch (NumberFormatException nfe) {
System.err.println("'" + args[0] + "': invalid timeMax value.");
usage();
}
}
System.out.println("About to execute for " + timeMax + " seconds.");
long count = 0;
int res = -1;
long start_time = System.currentTimeMillis();
while (System.currentTimeMillis() < start_time + (timeMax * 1000)) {
count++;
// Original objmonusage005 test block starts here:
//
LockingThread thr = new LockingThread();
startingBarrier = new Wicket();
thr.start();
startingBarrier.waitFor();
check(lockCheck);
thr.letItGo();
//
// Original objmonusage005 test block ends here.
res = getRes();
if (res != 0) {
return res;
}
// The worker thread is free to exit after the letItGo()
// call above. This loop stresses the use of JVM/TI
// GetObjectMonitorUsage() at thread exit time.
synchronized (lockCheck) {
// lockCheck needs to be locked for JVM/TI
// GetObjectMonitorUsage() to cover the right
// code paths.
while (true) {
check(lockCheck);
res = getRes();
if (res != 0) {
break;
}
if (!thr.isAlive()) {
// Done with JVM/TI GetObjectMonitorUsage() calls
// since thread is not alive.
break;
}
}
}
try {
thr.join();
} catch (InterruptedException e) {
throw new Error("Unexpected: " + e);
}
}
System.out.println("Executed " + count + " loops in " + timeMax +
" seconds.");
return res;
}
public static void usage() {
System.err.println("Usage: " + AGENT_LIB + " [time_max]");
System.err.println("where:");
System.err.println(" time_max max looping time in seconds");
System.err.println(" (default is " + DEF_TIME_MAX +
" seconds)");
System.exit(1);
}
static class LockingThread extends Thread {
private volatile boolean flag = true;
public synchronized void run() {
synchronized (lockCheck) {
startingBarrier.unlock();
int i = 0;
int n = 1000;
while (flag) {
if (n <= 0) {
n = 1000;
}
if (i > n) {
i = 0;
n--;
}
i++;
}
}
}
public void letItGo() {
flag = false;
}
}
}
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