1 /*

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

     3  *

     4  * This code is free software; you can redistribute it and/or modify it

     5  * under the terms of the GNU General Public License version 2 only, as

     6  * published by the Free Software Foundation.

     7  *

     8  * This code is distributed in the hope that it will be useful, but WITHOUT

     9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    11  * version 2 for more details (a copy is included in the LICENSE file that

    12  * accompanied this code).

    13  *

    14  * You should have received a copy of the GNU General Public License version

    15  * 2 along with this work; if not, write to the Free Software Foundation,

    16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    17  *

    18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    19  * or visit www.oracle.com if you need additional information or have any

    20  * questions.

    21  *

    22  */

    23 

    24 /* @test TestJNIGlobalRefs

    25  * @summary Test JNI Global Refs with Shenandoah

    26  * @key gc

    27  * @requires vm.gc.Shenandoah

    28  * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xlog:gc -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahVerify TestJNIGlobalRefs

    29  * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xlog:gc -XX:ShenandoahGCHeuristics=aggressive                       TestJNIGlobalRefs

    30  */

    31 

    32 import java.util.Arrays;

    33 import java.util.Random;

    34 

    35 public class TestJNIGlobalRefs {

    36     static {

    37         System.loadLibrary("TestJNIGlobalRefs");

    38     }

    39 

    40     private static final int TIME_MSEC = 120000;

    41     private static final int ARRAY_SIZE = 10000;

    42 

    43     private static native void makeGlobalRef(Object o);

    44     private static native void makeWeakGlobalRef(Object o);

    45     private static native Object readGlobalRef();

    46     private static native Object readWeakGlobalRef();

    47 

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

    49         seedGlobalRef();

    50         seedWeakGlobalRef();

    51         long start = System.currentTimeMillis();

    52         long current = start;

    53         while (current - start < TIME_MSEC) {

    54             testGlobal();

    55             testWeakGlobal();

    56             Thread.sleep(1);

    57             current = System.currentTimeMillis();

    58         }

    59     }

    60 

    61     private static void seedGlobalRef() {

    62         int[] a = new int[ARRAY_SIZE];

    63         fillArray(a, 1337);

    64         makeGlobalRef(a);

    65     }

    66 

    67     private static void seedWeakGlobalRef() {

    68         int[] a = new int[ARRAY_SIZE];

    69         fillArray(a, 8080);

    70         makeWeakGlobalRef(a);

    71     }

    72 

    73     private static void testGlobal() {

    74         int[] a = (int[]) readGlobalRef();

    75         checkArray(a, 1337);

    76     }

    77 

    78     private static void testWeakGlobal() {

    79         int[] a = (int[]) readWeakGlobalRef();

    80         if (a != null) {

    81             checkArray(a, 8080);

    82         } else {

    83             // weak reference is cleaned, recreate:

    84             seedWeakGlobalRef();

    85         }

    86     }

    87 

    88     private static void fillArray(int[] array, int seed) {

    89         Random r = new Random(seed);

    90         for (int i = 0; i < ARRAY_SIZE; i++) {

    91             array[i] = r.nextInt();

    92         }

    93     }

    94 

    95     private static void checkArray(int[] array, int seed) {

    96         Random r = new Random(seed);

    97         if (array.length != ARRAY_SIZE) {

    98             throw new IllegalStateException("Illegal array length: " + array.length + ", but expected " + ARRAY_SIZE);

    99         }

   100         for (int i = 0; i < ARRAY_SIZE; i++) {

   101             int actual = array[i];

   102             int expected = r.nextInt();

   103             if (actual != expected) {

   104                 throw new IllegalStateException("Incorrect array data: " + actual + ", but expected " + expected);

   105             }

   106         }

   107     }

   108 }