/*

 * 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.

 */

/*

 * @test

 * @bug 8055008

 * @summary Redefine EMCP and non-EMCP methods that are running in an infinite loop

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

 * @modules java.compiler

 *          java.instrument

 *          jdk.jartool/sun.tools.jar

 * @run main RedefineClassHelper

 * @run main/othervm -javaagent:redefineagent.jar -XX:TraceRedefineClasses=0x600 RedefineRunningMethods

 */

public class RedefineRunningMethods {

    public static String newB =

                "class RedefineRunningMethods$B {" +

                "   static int count1 = 0;" +

                "   static int count2 = 0;" +

                "   public static volatile boolean stop = false;" +

                "  static void localSleep() { " +

                "    try{ " +

                "      Thread.currentThread().sleep(10);" +

                "    } catch(InterruptedException ie) { " +

                "    } " +

                " } " +

                "   public static void infinite() { " +

                "       System.out.println(\"infinite called\");" +

                "   }" +

                "   public static void infinite_emcp() { " +

                "       while (!stop) { count2++; localSleep(); }" +

                "   }" +

                "}";

    public static String evenNewerB =

                "class RedefineRunningMethods$B {" +

                "   static int count1 = 0;" +

                "   static int count2 = 0;" +

                "   public static volatile boolean stop = false;" +

                "  static void localSleep() { " +

                "    try{ " +

                "      Thread.currentThread().sleep(1);" +

                "    } catch(InterruptedException ie) { " +

                "    } " +

                " } " +

                "   public static void infinite() { }" +

                "   public static void infinite_emcp() { " +

                "       System.out.println(\"infinite_emcp now obsolete called\");" +

                "   }" +

                "}";

    static class B {

        static int count1 = 0;

        static int count2 = 0;

        public static volatile boolean stop = false;

        static void localSleep() {

          try{

            Thread.currentThread().sleep(10);//sleep for 10 ms

          } catch(InterruptedException ie) {

          }

        }

        public static void infinite() {

            while (!stop) { count1++; localSleep(); }

        }

        public static void infinite_emcp() {

            while (!stop) { count2++; localSleep(); }

        }

    }

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

        new Thread() {

            public void run() {

                B.infinite();

            }

        }.start();

        new Thread() {

            public void run() {

                B.infinite_emcp();

            }

        }.start();

        RedefineClassHelper.redefineClass(B.class, newB);

        System.gc();

        B.infinite();

        // Start a thread with the second version of infinite_emcp running

        new Thread() {

            public void run() {

                B.infinite_emcp();

            }

        }.start();

        for (int i = 0; i < 20 ; i++) {

            String s = new String("some garbage");

            System.gc();

        }

        RedefineClassHelper.redefineClass(B.class, evenNewerB);

        System.gc();

        for (int i = 0; i < 20 ; i++) {

            B.infinite();

            String s = new String("some garbage");

            System.gc();

        }

        B.infinite_emcp();

        // purge should clean everything up.

        B.stop = true;

        for (int i = 0; i < 20 ; i++) {

            B.infinite();

            String s = new String("some garbage");

            System.gc();

        }

    }

}