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

 *

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 *

 * 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,

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/**

 * @test SystemGCOnForegroundCollector

 * @summary CMS: Call reset_after_compaction() only if a compaction has been done

 * @bug 8013184

 * @key gc

 * @key regression

 * @library /testlibrary

 * @run main/othervm SystemGCOnForegroundCollector

 * @author jon.masamitsu@oracle.com

 */

import com.oracle.java.testlibrary.*;

public class SystemGCOnForegroundCollector {

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

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(

      "-showversion",

      "-XX:+UseConcMarkSweepGC",

      "-XX:MaxTenuringThreshold=1",

      "-XX:-UseCMSCompactAtFullCollection",

      ThreePlusMSSystemGC.class.getName()

      );

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

    output.shouldNotContain("error");

    output.shouldHaveExitValue(0);

  }

  static class ThreePlusMSSystemGC {

    public static void main(String [] args) {

      // From running this test 3 System.gc() were always

      // enough to see the failure but the cause of the failure

      // depends on how objects are allocated in the CMS generation

      // which is non-deterministic.  Use 30 iterations for a more

      // reliable test.

      for (int i = 0; i < 30; i++) {

        System.gc();

      }

    }

  }

}