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/*
* Copyright (c) 2003, 2018, 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.GetCurrentContendedMonitor;
import nsk.share.Wicket;
import java.io.PrintStream;
public class contmon001 {
native static void checkMon(int point, Thread thr, Object mon);
native static int getRes();
static {
try {
System.loadLibrary("contmon001");
} catch (UnsatisfiedLinkError ule) {
System.err.println("Could not load contmon001 library");
System.err.println("java.library.path:"
+ System.getProperty("java.library.path"));
throw ule;
}
}
public static Wicket startingBarrier;
public static Wicket waitingBarrier;
static Object lockFld = new Object();
static boolean DEBUG_MODE = false;
static PrintStream out;
public static void main(String[] args) {
args = nsk.share.jvmti.JVMTITest.commonInit(args);
System.exit(run(args, System.out) + 95/*STATUS_TEMP*/);
}
public static int run(String argv[], PrintStream ref) {
out = ref;
for (int i = 0; i < argv.length; i++) {
if (argv[i].equals("-v")) // verbose mode
DEBUG_MODE = true;
}
Object lock = new Object();
Thread currThr = Thread.currentThread();
if (DEBUG_MODE)
out.println("\nCheck #1: verifying a contended monitor of current thread \""
+ currThr.getName() + "\" ...");
synchronized (lock) {
checkMon(1, currThr, null);
}
if (DEBUG_MODE)
out.println("Check #1 done");
contmon001a thr = new contmon001a();
startingBarrier = new Wicket();
waitingBarrier = new Wicket();
thr.start();
if (DEBUG_MODE)
out.println("\nWaiting for auxiliary thread ...");
startingBarrier.waitFor();
if (DEBUG_MODE)
out.println("Auxiliary thread is ready");
if (DEBUG_MODE)
out.println("\nCheck #3: verifying a contended monitor of auxiliary thread ...");
checkMon(3, thr, null);
if (DEBUG_MODE)
out.println("Check #3 done");
thr.letItGo();
waitingBarrier.waitFor();
synchronized (lockFld) {
if (DEBUG_MODE)
out.println("\nMain thread entered lockFld's monitor"
+ "\n\tand calling lockFld.notifyAll() to awake auxiliary thread");
lockFld.notifyAll();
if (DEBUG_MODE)
out.println("\nCheck #4: verifying a contended monitor of auxiliary thread ...");
checkMon(4, thr, lockFld);
if (DEBUG_MODE)
out.println("Check #4 done");
}
if (DEBUG_MODE)
out.println("\nMain thread released lockFld's monitor"
+ "\n\tand waiting for auxiliary thread death ...");
try {
thr.join();
} catch (InterruptedException e) {
throw new Error("Unexpected " + e);
}
if (DEBUG_MODE)
out.println("\nCheck #5: verifying a contended monitor of dead auxiliary thread ...");
checkMon(5, thr, null);
if (DEBUG_MODE)
out.println("Check #5 done");
return getRes();
}
}
class contmon001a extends Thread {
private volatile boolean flag = true;
public void run() {
if (contmon001.DEBUG_MODE)
contmon001.out.println("check #2: verifying a contended monitor of current auxiliary thread ...");
contmon001.checkMon(2, currentThread(), null);
if (contmon001.DEBUG_MODE)
contmon001.out.println("check #2 done");
if (contmon001.DEBUG_MODE)
contmon001.out.println("notifying main thread");
contmon001.startingBarrier.unlock();
if (contmon001.DEBUG_MODE)
contmon001.out.println("thread is going to loop while <flag> is true ...");
int i = 0;
int n = 1000;
while (flag) {
if (n <= 0) {
n = 1000;
}
if (i > n) {
i = 0;
n--;
}
i++;
}
if (contmon001.DEBUG_MODE)
contmon001.out.println("looping is done: <flag> is false");
synchronized (contmon001.lockFld) {
contmon001.waitingBarrier.unlock();
if (contmon001.DEBUG_MODE)
contmon001.out.println("\nthread entered lockFld's monitor"
+ "\n\tand releasing it through the lockFld.wait() call");
try {
contmon001.lockFld.wait();
} catch (InterruptedException e) {
throw new Error("Unexpected " + e);
}
}
if (contmon001.DEBUG_MODE)
contmon001.out.println("thread exiting");
}
public void letItGo() {
flag = false;
}
}
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