1 /*
2 * Copyright (c) 2013, 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 /**
25 * @test
26 * @bug 8022595
27 * @summary JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
28 * @library /testlibrary
29 * @modules java.base/sun.misc
30 * java.management
31 * @run main/othervm ConcurrentClassLoadingTest
32 */
33 import jdk.test.lib.Utils;
34 import java.util.ArrayList;
35 import java.util.Arrays;
36 import java.util.List;
37 import java.util.Random;
38 import java.util.concurrent.BrokenBarrierException;
39 import java.util.concurrent.CyclicBarrier;
40
41 public class ConcurrentClassLoadingTest {
42 int numThreads = 0;
43 CyclicBarrier l;
44 private static final Random rand = Utils.getRandomInstance();
45
46 public static void main(String[] args) throws Throwable {
47 ConcurrentClassLoadingTest test = new ConcurrentClassLoadingTest();
48 test.parseArgs(args);
49 test.run();
50 }
51
52 void parseArgs(String[] args) {
53 int i = 0;
54 while (i < args.length) {
55 String flag = args[i];
56 switch(flag) {
57 case "-numThreads":
58 numThreads = Integer.parseInt(args[++i]);
59 break;
60 default:
61 throw new Error("Unknown flag: " + flag);
62 }
63 ++i;
64 }
65 }
66
67 void init() {
68 if (numThreads == 0) {
69 numThreads = Runtime.getRuntime().availableProcessors();
70 }
71
72 l = new CyclicBarrier(numThreads + 1);
73
74 System.out.printf("Threads: %d\n", numThreads);
75 }
76
77 final List<Loader> loaders = new ArrayList<>();
78
79 void prepare() {
80 List<String> c = new ArrayList<>(Arrays.asList(classNames));
81
82 // Split classes between loading threads
83 int count = (classNames.length / numThreads) + 1;
84 for (int t = 0; t < numThreads; t++) {
85 List<String> sel = new ArrayList<>();
86
87 System.out.printf("Thread #%d:\n", t);
88 for (int i = 0; i < count; i++) {
89 if (c.isEmpty()) {
90 break;
91 }
92
93 int k = rand.nextInt(c.size());
94 String elem = c.remove(k);
95 sel.add(elem);
96 System.out.printf("\t%s\n", elem);
97 }
98 loaders.add(new Loader(sel));
99 }
100
101 // Print diagnostic info when the test hangs
102 Runtime.getRuntime().addShutdownHook(new Thread() {
103 public void run() {
104 boolean alive = false;
105 for (Loader l : loaders) {
106 if (!l.isAlive()) continue;
107
108 if (!alive) {
109 System.out.println("Some threads are still alive:");
110 alive = true;
111 }
112
113 System.out.println(l.getName());
114 for (StackTraceElement elem : l.getStackTrace()) {
115 System.out.println("\t"+elem.toString());
116 }
117 }
118 }
119 });
120 }
121
122 public void run() throws Throwable {
123 init();
124 prepare();
125
126 for (Loader loader : loaders) {
127 loader.start();
128 }
129
130 l.await();
131
132 for (Loader loader : loaders) {
133 loader.join();
134 }
135 }
136
137 class Loader extends Thread {
138 List<String> classes;
139
140 public Loader(List<String> classes) {
141 this.classes = classes;
142 setDaemon(true);
143 }
144
145 @Override
146 public void run() {
147 try {
148 l.await();
149
150 for (String name : classes) {
151 Class.forName(name).getName();
152 }
153 } catch (ClassNotFoundException | BrokenBarrierException | InterruptedException e) {
154 throw new Error(e);
155 }
156 }
157 }
158
159 final static String[] classNames = {
160 "java.lang.invoke.CallSite",
161 "java.lang.invoke.ConstantCallSite",
162 "java.lang.invoke.LambdaConversionException",
163 "java.lang.invoke.LambdaMetafactory",
164 "java.lang.invoke.MethodHandle",
165 "java.lang.invoke.MethodHandleInfo",
166 "java.lang.invoke.MethodHandleProxies",
167 "java.lang.invoke.MethodHandles",
168 "java.lang.invoke.MethodType",
169 "java.lang.invoke.MutableCallSite",
170 "java.lang.invoke.SerializedLambda",
171 "java.lang.invoke.SwitchPoint",
172 "java.lang.invoke.VolatileCallSite",
173 "java.lang.invoke.WrongMethodTypeException"
174 };
175 }