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 * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 * 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

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/**

 * @test TestManyThreads

 * @key gc

 * @requires vm.gc.Epsilon

 * @summary Test allocations from many threads

 *

 * @run main/othervm -Xmx128m -Xss512k                                        -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads

 * @run main/othervm -Xmx128m -Xss512k -Xint                                  -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads

 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp                         -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads

 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads

 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:-TieredCompilation  -XX:-UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads

 *

 * @run main/othervm -Xmx128m -Xss512k                                        -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads

 * @run main/othervm -Xmx128m -Xss512k -Xint                                  -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads

 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp                         -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads

 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:TieredStopAtLevel=1 -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads

 * @run main/othervm -Xmx128m -Xss512k -Xbatch -Xcomp -XX:-TieredCompilation  -XX:+UseTLAB -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC TestManyThreads

 */

import java.util.concurrent.atomic.*;

public class TestManyThreads {

  static int COUNT = Integer.getInteger("count", 128);  // 128 * 4M max tlabs = 512M, would overflow without TLAB sizing

  static volatile Object sink;

  static volatile Throwable failed;

  static final AtomicInteger allocated = new AtomicInteger();

  public static void workload() {

    try {

      sink = new Object();

      allocated.incrementAndGet();

      Thread.sleep(3600 * 1000);

    } catch (Throwable e) {

      failed = e;

    }

  }

  public static void main(String[] args) throws Throwable {

    for (int c = 0; c < COUNT; c++) {

      Thread t = new Thread(TestManyThreads::workload);

      t.setDaemon(true);

      t.start();

    }

    while ((failed == null) && (allocated.get() != COUNT)) {

        Thread.sleep(100);

    }

    if (failed != null) {

      throw failed;

    }

  }

}