/*

 * Copyright (c) 2015, 2019, 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

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 */

package gc.arguments;

/*

 * @test TestNewSizeThreadIncrease

 * @key gc

 * @bug 8144527

 * @summary Tests argument processing for NewSizeThreadIncrease

 * @library /test/lib

 * @requires vm.gc.Serial

 * @modules java.base/jdk.internal.misc

 *          java.management

 * @run main gc.arguments.TestNewSizeThreadIncrease

 */

import jdk.test.lib.Platform;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

// Range of NewSizeThreadIncrease is 0 ~ max_uintx.

// Total of 5 threads will be created (1 GCTest thread and 4 TestThread).

public class TestNewSizeThreadIncrease {

  static final String VALID_VALUE = "2097152"; // 2MB

  // This value will make an overflow of 'thread count * NewSizeThreadIncrease' at DefNewGeneration::compute_new_size().

  // = (max_uintx / 5) + 1, = (18446744073709551615 / 5) + 1

  static String INVALID_VALUE_1 = "3689348814741910324";

  // This string is contained when compute_new_size() expands or shrinks.

  static final String LOG_NEWSIZE_CHANGED = "New generation size ";

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

    if (Platform.is32bit()) {

      // (max_uintx / 5) + 1, 4294967295/5 + 1

      INVALID_VALUE_1 = "858993460";

    }

    // New size will be applied as NewSizeThreadIncrease is small enough to expand.

    runNewSizeThreadIncreaseTest(VALID_VALUE, true);

    // New size will be ignored as 'thread count * NewSizeThreadIncrease' overflows.

    runNewSizeThreadIncreaseTest(INVALID_VALUE_1, false);

  }

  static void runNewSizeThreadIncreaseTest(String expectedValue, boolean isNewsizeChanged) throws Exception {

    OutputAnalyzer output = new OutputAnalyzer(pb.start());

    output.shouldHaveExitValue(0);

    if (isNewsizeChanged) {

      output.shouldContain(LOG_NEWSIZE_CHANGED);

    } else {

      output.shouldNotContain(LOG_NEWSIZE_CHANGED);

    }

  }

  static class GCTest {

    static final int MAX_THREADS_COUNT = 4;

    static TestThread threads[] = new TestThread[MAX_THREADS_COUNT];

    public static void main(String[] args) {

      System.out.println("Creating garbage");

      for (int i=0; i<MAX_THREADS_COUNT; i++) {

        threads[i] = new TestThread();

        threads[i].start();

      }

      System.gc();

      for (int i=0; i<MAX_THREADS_COUNT; i++) {

        threads[i].stopRunning();

      }

      System.out.println("Done");

    }

    private static class TestThread extends Thread {

      volatile boolean isRunning = true;

      public void run() {

        while (isRunning == true) {

          try {

            Thread.sleep(10);

          } catch (Throwable t) {

          }

        }

      }

      public void stopRunning() {

        isRunning = false;

      }

    }

  }

}