1 /* 2 * Copyright (c) 2007, 2019, 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 package gc.cslocker; 25 26 /* 27 * @test TestCSLocker 28 * @key gc 29 * @bug 6186200 30 * @summary This short test check RFE 6186200 changes. One thread locked 31 * @summary completely in JNI CS, while other is trying to allocate memory 32 * @summary provoking GC. OOM means FAIL, deadlock means PASS. 33 * @run main/native/othervm -Xmx256m gc.cslocker.TestCSLocker 34 */ 35 36 public class TestCSLocker extends Thread 37 { 38 static int timeout = 5000; 39 public static void main(String args[]) throws Exception { 40 long startTime = System.currentTimeMillis(); 41 42 // start garbage producer thread 43 GarbageProducer garbageProducer = new GarbageProducer(1000000, 10); 44 garbageProducer.start(); 45 46 // start CS locker thread 47 CSLocker csLocker = new CSLocker(); 48 csLocker.start(); 49 50 // check timeout to success deadlocking 51 while(System.currentTimeMillis() < startTime + timeout) { 52 System.out.println("sleeping..."); 53 sleep(1000); 54 } 55 56 csLocker.unlock(); 57 garbageProducer.interrupt(); 58 } 59 } 60 61 class GarbageProducer extends Thread 62 { 63 private int size; 64 private int sleepTime; 65 66 GarbageProducer(int size, int sleepTime) { 67 this.size = size; 68 this.sleepTime = sleepTime; 69 } 70 71 public void run() { 72 boolean isRunning = true; 73 74 while (isRunning) { 75 try { 76 int[] arr = null; 77 arr = new int[size]; 78 sleep(sleepTime); 79 } catch (InterruptedException e) { 80 isRunning = false; 81 } 82 } 83 } 84 } 85 86 class CSLocker extends Thread 87 { 88 static { System.loadLibrary("TestCSLocker"); } 89 90 public void run() { 91 int[] a = new int[10]; 92 a[0] = 1; 93 if (!lock(a)) { 94 throw new RuntimeException("failed to acquire CSLock"); 95 } 96 } 97 98 native boolean lock(int[] array); 99 native void unlock(); 100 }