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/*
* Copyright (c) 2007, 2025, 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.ResourceExhausted;
import java.io.PrintStream;
import java.util.concurrent.atomic.AtomicInteger;
import jdk.test.lib.Platform;
import nsk.share.Consts;
import nsk.share.test.Stresser;
import jtreg.SkippedException;
public class resexhausted001 {
static {
System.loadLibrary("resexhausted");
}
static final long MAX_ITERATIONS = 2000000L; // Resasonable limit on number of threads
static Object hanger = new Object();
static boolean threadsDone;
static AtomicInteger threadCount = new AtomicInteger();
public static int run(String args[], PrintStream out) {
// Check platform here (instead of @requires) as this test is also called from resexhausted004
if (Platform.isWindows()) {
throw new SkippedException("Cannot get JVMTI_RESOURCE_EXHAUSTED_THREADS on Windows");
}
Stresser stress = new Stresser(args);
int count = 0;
threadsDone = false;
threadCount.set(0);
Helper.resetExhaustedEvent();
System.out.println("Creating threads...");
stress.start(MAX_ITERATIONS);
try {
while ( stress.iteration() ) {
makeThread();
}
System.out.println("Test resexhausted001: Can't reproduce OOME due to a limit on iterations/execution time. Test was useless."
+ " threadCount=" + threadCount.get());
throw new SkippedException("Test did not get an OutOfMemory error");
} catch (OutOfMemoryError e) {
count = threadCount.get();
} finally {
synchronized (hanger) {
threadsDone = true;
hanger.notifyAll();
}
stress.finish();
}
while ( threadCount.get() > 2 ) {
try { Thread.sleep(100); } catch ( InterruptedException swallow ) {}
}
System.gc();
System.out.println("got OOME with threadCount=" + count);
if (!Helper.checkResult(Helper.JVMTI_RESOURCE_EXHAUSTED_THREADS, "creating " + count + " threads")) {
return Consts.TEST_FAILED;
}
return Consts.TEST_PASSED;
}
static Thread makeThread() {
final Thread thr = new Thread(new Runnable() {
public void run() {
threadCount.getAndIncrement();
synchronized (hanger) {
while (!threadsDone) {
try {
hanger.wait();
} catch (InterruptedException ignored) {}
}
}
threadCount.getAndDecrement();
}
}, "fleece");
thr.setDaemon(true);
thr.start();
return thr;
}
public static void main(String[] args) {
args = nsk.share.jvmti.JVMTITest.commonInit(args);
int result = run(args, System.out);
System.out.println(result == Consts.TEST_PASSED ? "TEST PASSED" : "TEST FAILED");
System.exit(result + Consts.JCK_STATUS_BASE);
}
}
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