New test/runtime/logging/SafepointTestMain.java (original) (raw)
1 /*
2 * Copyright (c) 2015, 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 import java.lang.ref.WeakReference;
25
26 public class SafepointTestMain {
27 public static class B {
28 static int count = 0;
29 public static volatile boolean stop = false;
30 static void localSleep(int time) {
31 try{
32 Thread.currentThread().sleep(time);
33 } catch(InterruptedException ie) {
34 }
35 }
36
37 public static void infinite() {
38 while (!stop) { count++; }
39 }
40 }
41
42 public static byte[] garbage;
43 public static volatile WeakReference weakref;
44
45 public static void createweakref() {
46 Object o = new Object();
47 weakref = new WeakReference<>(o);
48 }
49
50 public static void main(String[] args) throws Exception {
51 new Thread() {
52 public void run() {
53 B.infinite();
54 }
55 }.start();
56 B.localSleep(1000);
57 for (int i = 0; i < 2; i++) {
58 createweakref();
59 while(weakref.get() != null) {
60 garbage = new byte[8192];
61 System.gc();
62 }
63 }
64 B.stop = true;
65 }
66 }