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 }