1 /*
   2  * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 /* @test TestJNIGlobalRefs
  26  * @summary Test JNI Global Refs with Shenandoah
  27  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  28  *
  29  * @run main/othervm/native -Xmx1g -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
  30  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
  31  *      -XX:+ShenandoahVerify
  32  *      TestJNIGlobalRefs
  33  */
  34 
  35 /* @test TestJNIGlobalRefs
  36  * @summary Test JNI Global Refs with Shenandoah
  37  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  38  *
  39  * @run main/othervm/native -Xmx1g -Xlog:gc -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
  40  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
  41  *      TestJNIGlobalRefs
  42  */
  43 
  44 import java.util.Arrays;
  45 import java.util.Random;
  46 
  47 public class TestJNIGlobalRefs {
  48     static {
  49         System.loadLibrary("TestJNIGlobalRefs");
  50     }
  51 
  52     private static final int TIME_MSEC = 120000;
  53     private static final int ARRAY_SIZE = 10000;
  54 
  55     private static native void makeGlobalRef(Object o);
  56     private static native void makeWeakGlobalRef(Object o);
  57     private static native Object readGlobalRef();
  58     private static native Object readWeakGlobalRef();
  59 
  60     public static void main(String[] args) throws Throwable {
  61         seedGlobalRef();
  62         seedWeakGlobalRef();
  63         long start = System.currentTimeMillis();
  64         long current = start;
  65         while (current - start < TIME_MSEC) {
  66             testGlobal();
  67             testWeakGlobal();
  68             Thread.sleep(1);
  69             current = System.currentTimeMillis();
  70         }
  71     }
  72 
  73     private static void seedGlobalRef() {
  74         int[] a = new int[ARRAY_SIZE];
  75         fillArray(a, 1337);
  76         makeGlobalRef(a);
  77     }
  78 
  79     private static void seedWeakGlobalRef() {
  80         int[] a = new int[ARRAY_SIZE];
  81         fillArray(a, 8080);
  82         makeWeakGlobalRef(a);
  83     }
  84 
  85     private static void testGlobal() {
  86         int[] a = (int[]) readGlobalRef();
  87         checkArray(a, 1337);
  88     }
  89 
  90     private static void testWeakGlobal() {
  91         int[] a = (int[]) readWeakGlobalRef();
  92         if (a != null) {
  93             checkArray(a, 8080);
  94         } else {
  95             // weak reference is cleaned, recreate:
  96             seedWeakGlobalRef();
  97         }
  98     }
  99 
 100     private static void fillArray(int[] array, int seed) {
 101         Random r = new Random(seed);
 102         for (int i = 0; i < ARRAY_SIZE; i++) {
 103             array[i] = r.nextInt();
 104         }
 105     }
 106 
 107     private static void checkArray(int[] array, int seed) {
 108         Random r = new Random(seed);
 109         if (array.length != ARRAY_SIZE) {
 110             throw new IllegalStateException("Illegal array length: " + array.length + ", but expected " + ARRAY_SIZE);
 111         }
 112         for (int i = 0; i < ARRAY_SIZE; i++) {
 113             int actual = array[i];
 114             int expected = r.nextInt();
 115             if (actual != expected) {
 116                 throw new IllegalStateException("Incorrect array data: " + actual + ", but expected " + expected);
 117             }
 118         }
 119     }
 120 }