1 /* 2 * Copyright (c) 2002, 2018, Oracle and/or its affiliates. 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 /* 26 * @test 27 * @key gc 28 * 29 * @summary converted from VM Testbase gc/gctests/nativeGC01. 30 * VM Testbase keywords: [gc] 31 * VM Testbase readme: 32 * This test creates a large linked list of 10,000 elements. After creating the 33 * linked list a native function is called. The native function calls a java 34 * method that removes all java references to the linked list and forces a garbage 35 * collection. The only live reference to the linked list if on the C stack . As 36 * there is a live reference on the C stack, the linked list should not be garbage collected. 37 * After forcing a garbage collection, the native code calls another java method 38 * that traverses the linked list to verify that the linked list has not 39 * been garbage collected. 40 * 41 * @library /vmTestbase 42 * /test/lib 43 * @run driver jdk.test.lib.FileInstaller . . 44 * @run main/othervm/native gc.gctests.nativeGC01.nativeGC01 45 */ 46 47 package gc.gctests.nativeGC01; 48 49 import nsk.share.test.*; 50 import nsk.share.gc.*; 51 import java.util.Vector; 52 53 public class nativeGC01 extends TestBase { 54 private CircularLinkedList cl; 55 56 public native int nativeMethod01(CircularLinkedList cl); 57 58 // This method is a callback that is invoked by a by the native 59 // function "nativeMethod()" before the bowels of the nativeMethod() 60 // function are executed. 61 62 public void callbackGC() { 63 cl = null; 64 System.gc(); 65 } 66 67 public void run() { 68 int elementCount; 69 cl = buildBigCircularLinkedList(); // build a 2 meg Circular Linked list. 70 // Determine number of elements in the linked list with a native method 71 // after GC has been done. 72 73 try { 74 elementCount = nativeMethod01(cl); 75 76 if (elementCount == 10000) { 77 log.info("Test Passed"); 78 } else { 79 log.info("Test Failed"); 80 setFailed(true); 81 } 82 } catch (Exception e ) { 83 log.info(e); 84 log.info("broken test"); 85 setFailed(true); 86 } 87 88 } 89 90 // build a circular linked list of 0.4 Meg 91 private CircularLinkedList buildBigCircularLinkedList() { 92 CircularLinkedList cl = new CircularLinkedList(100); 93 for(int i = 0; i < 10000; i++) 94 cl.grow(); 95 return cl; 96 } 97 98 static { 99 System.loadLibrary("nativeGC01"); 100 } 101 102 public static void main(String args[]){ 103 Tests.runTest(new nativeGC01(), args); 104 } 105 }