1 /* 2 * Copyright (c) 2011, 2013, 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 26 @summary <rdar://problem/3992478> 27 @summary Make sure that memory allocated by ByteBuffer.allocateDirect can be reclaimed by the garbage collector 28 @summary Note that this test starts by allocating very large chunks of memory, so this may disturb other tests slightly 29 @summary com.apple.junit.java.nio; 30 @run main AllocateDirect01 31 */ 32 33 import junit.framework.*; 34 35 import java.nio.ByteBuffer; 36 import java.util.Timer; 37 import java.util.TimerTask; 38 39 public class AllocateDirect01 extends TestCase { 40 41 // boilerplate 42 public static Test suite() { 43 return new TestSuite(AllocateDirect01.class); 44 } 45 46 public static void main (String[] args) throws RuntimeException { 47 TestResult tr = junit.textui.TestRunner.run(suite()); 48 if((tr.errorCount() != 0) || (tr.failureCount() != 0)) { 49 throw new RuntimeException("### Unexpected JUnit errors or failures."); 50 } 51 } 52 53 // Use a timer to end the test 54 volatile boolean endtest = false; 55 Timer ticktock = null; 56 protected void setUp() throws Exception { 57 ticktock = new Timer(); 58 59 TimerTask stopper = new TimerTask() { 60 public void run() { 61 endtest = true; 62 } 63 }; 64 ticktock.schedule( stopper, 1500L ); 65 } 66 67 protected void tearDown() throws Exception { 68 ticktock.cancel(); 69 } 70 71 72 // loop, allocating memory we expect to get reclaimed by GC 73 public void testBuffers() throws Exception { 74 75 // find some suitable size to loop with by using up all of memory 76 int size = 4; 77 while (endtest == false) { 78 try { 79 ByteBuffer bb = ByteBuffer.allocateDirect(size); 80 assertNotNull(bb); 81 size *= 1.5; 82 } 83 catch( OutOfMemoryError e) { 84 size /= 32; 85 break; 86 } 87 } 88 89 // We should be able to loop as long as we want, since buf can get reclaimed by gc 90 while (endtest == false) { 91 ByteBuffer buf = ByteBuffer.allocateDirect(size); 92 assertNotNull(buf); 93 } 94 95 } 96 } 97