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/*
* Copyright (c) 2010, 2022, 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 gc.lock;
import sun.hotspot.WhiteBox;
import nsk.share.runner.*;
import nsk.share.gc.*;
import nsk.share.gc.gp.GarbageUtils;
import nsk.share.gc.lock.*;
import nsk.share.test.ExecutionController;
/**
* Test how GC is affected by locking.
*
* A number of threads is started. Each one locks and eats memory.
*/
public class LockerTest extends ThreadedGCTest implements LockersAware {
private Lockers lockers;
private long objectSize = 1000;
private class Worker implements Runnable {
byte[] rezerve = new byte[1024];
private Locker locker = lockers.createLocker(rezerve);
public Worker() {
locker.enable();
}
public void run() {
ExecutionController stresser = getExecutionController();
// Use only 30% of the heap.
final long testMemorySize = 3 * Runtime.getRuntime().maxMemory() / 10;
while (stresser.continueExecution()) {
locker.lock();
GarbageUtils.engageGC(testMemorySize);
locker.unlock();
}
}
}
protected Runnable createRunnable(int i) {
return new Worker();
}
public void setLockers(Lockers lockers) {
this.lockers = lockers;
}
public static void main(String[] args) {
RunParams.getInstance().setRunMemDiagThread(false);
GC.runTest(new LockerTest(), args);
}
}
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