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
  25  * @summary Test JNI Global Refs with Shenandoah
  26  * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xlog:gc -XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahVerify TestJNIGlobalRefs
  27  * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xlog:gc -XX:ShenandoahGCHeuristics=aggressive                       TestJNIGlobalRefs
  28  */
  29 
  30 import java.util.Arrays;
  31 import java.util.Random;
  32 
  33 public class TestJNIGlobalRefs {
  34     static {
  35         System.loadLibrary("TestJNIGlobalRefs");
  36     }
  37 
  38     private static final int TIME_MSEC  = 120000;
  39     private static final int ARRAY_SIZE =  10000;
  40 
  41     private static native void makeGlobalRef(Object o);
  42     private static native void makeWeakGlobalRef(Object o);
  43     private static native Object readGlobalRef();
  44     private static native Object readWeakGlobalRef();
  45 
  46     public static void main(String[] args) throws Throwable {
  47         seedGlobalRef();
  48         seedWeakGlobalRef();
  49         long start = System.currentTimeMillis();
  50         long current = start;
  51         while (current - start < TIME_MSEC) {
  52             testGlobal();
  53             testWeakGlobal();
  54             Thread.sleep(1);
  55             current = System.currentTimeMillis();
  56         }
  57     }
  58 
  59     private static void seedGlobalRef() {
  60         int[] a = new int[ARRAY_SIZE];
  61         fillArray(a, 1337);
  62         makeGlobalRef(a);
  63     }
  64 
  65     private static void seedWeakGlobalRef() {
  66         int[] a = new int[ARRAY_SIZE];
  67         fillArray(a, 8080);
  68         makeWeakGlobalRef(a);
  69     }
  70 
  71     private static void testGlobal() {
  72         int[] a = (int[])readGlobalRef();
  73         checkArray(a, 1337);
  74     }
  75 
  76     private static void testWeakGlobal() {
  77         int[] a = (int[])readWeakGlobalRef();
  78         if (a != null) {
  79           checkArray(a, 8080);
  80         } else {
  81           // weak reference is cleaned, recreate:
  82           seedWeakGlobalRef();
  83         }
  84     }
  85 
  86     private static void fillArray(int[] array, int seed) {
  87         Random r = new Random(seed);
  88         for (int i = 0; i < ARRAY_SIZE; i++) {
  89             array[i] = r.nextInt();
  90         }
  91     }
  92 
  93     private static void checkArray(int[] array, int seed) {
  94         Random r = new Random(seed);
  95         if (array.length != ARRAY_SIZE) {
  96             throw new IllegalStateException("Illegal array length: " + array.length + ", but expected " + ARRAY_SIZE);
  97         }
  98         for (int i = 0; i < ARRAY_SIZE; i++) {
  99             int actual = array[i];
 100             int expected = r.nextInt();
 101             if (actual != expected) {
 102                 throw new IllegalStateException("Incorrect array data: " + actual + ", but expected " + expected);
 103             }
 104         }
 105     }
 106 }