1 /* 2 * Copyright (c) 2007, 2017 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 * @test TestCSLocker 26 * @key gc 27 * @bug 6186200 28 * @summary This short test check RFE 6186200 changes. One thread locked 29 * @summary completely in JNI CS, while other is trying to allocate memory 30 * @summary provoking GC. OOM means FAIL, deadlock means PASS. 31 * @run main/native/othervm -Xmx256m TestCSLocker 32 */ 33 34 public class TestCSLocker extends Thread 35 { 36 static int timeout = 5000; 37 public static void main(String args[]) throws Exception { 38 long startTime = System.currentTimeMillis(); 39 40 // start garbage producer thread 41 GarbageProducer garbageProducer = new GarbageProducer(1000000, 10); 42 garbageProducer.start(); 43 44 // start CS locker thread 45 CSLocker csLocker = new CSLocker(); 46 csLocker.start(); 47 48 // check timeout to success deadlocking 49 while(System.currentTimeMillis() < startTime + timeout) { 50 System.out.println("sleeping..."); 51 sleep(1000); 52 } 53 54 csLocker.unlock(); 55 garbageProducer.interrupt(); 56 } 57 } 58 59 class GarbageProducer extends Thread 60 { 61 private int size; 62 private int sleepTime; 63 64 GarbageProducer(int size, int sleepTime) { 65 this.size = size; 66 this.sleepTime = sleepTime; 67 } 68 69 public void run() { 70 boolean isRunning = true; 71 72 while (isRunning) { 73 try { 74 int[] arr = null; 75 arr = new int[size]; 76 sleep(sleepTime); 77 } catch (InterruptedException e) { 78 isRunning = false; 79 } 80 } 81 } 82 } 83 84 class CSLocker extends Thread 85 { 86 static { System.loadLibrary("TestCSLocker"); } 87 88 public void run() { 89 int[] a = new int[10]; 90 a[0] = 1; 91 if (!lock(a)) { 92 throw new RuntimeException("failed to acquire CSLock"); 93 } 94 } 95 96 native boolean lock(int[] array); 97 native void unlock(); 98 }