1 /*
2 * Copyright (c) 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 * @bug 8022595
27 * @summary JSR292: deadlock during class loading of MethodHandles, MethodHandleImpl & MethodHandleNatives
28 *
29 * @run main/othervm ConcurrentClassLoadingTest
30 */
31 import java.util.*;
32 import java.util.concurrent.BrokenBarrierException;
33 import java.util.concurrent.CyclicBarrier;
34
35 public class ConcurrentClassLoadingTest {
36 int numThreads = 0;
37 long seed = 0;
38 CyclicBarrier l;
39 Random rand;
40
41 public static void main(String[] args) throws Throwable {
42 ConcurrentClassLoadingTest test = new ConcurrentClassLoadingTest();
43 test.parseArgs(args);
44 test.run();
45 }
46
47 void parseArgs(String[] args) {
48 int i = 0;
49 while (i < args.length) {
50 String flag = args[i];
51 switch(flag) {
52 case "-seed":
53 seed = Long.parseLong(args[++i]);
54 break;
55 case "-numThreads":
56 numThreads = Integer.parseInt(args[++i]);
57 break;
58 default:
59 throw new Error("Unknown flag: " + flag);
60 }
61 ++i;
62 }
63 }
64
65 void init() {
66 if (numThreads == 0) {
67 numThreads = Runtime.getRuntime().availableProcessors();
68 }
69
70 if (seed == 0) {
71 seed = (new Random()).nextLong();
72 }
73 rand = new Random(seed);
74
75 l = new CyclicBarrier(numThreads + 1);
76
77 System.out.printf("Threads: %d\n", numThreads);
78 System.out.printf("Seed: %d\n", seed);
79 }
80
81 final List<Loader> loaders = new ArrayList<>();
82
83 void prepare() {
84 List<String> c = new ArrayList<>(Arrays.asList(classNames));
85
86 // Split classes between loading threads
87 int count = (classNames.length / numThreads) + 1;
88 for (int t = 0; t < numThreads; t++) {
89 List<String> sel = new ArrayList<>();
90
91 System.out.printf("Thread #%d:\n", t);
92 for (int i = 0; i < count; i++) {
93 if (c.size() == 0) break;
94
95 int k = rand.nextInt(c.size());
96 String elem = c.remove(k);
97 sel.add(elem);
98 System.out.printf("\t%s\n", elem);
99 }
100 loaders.add(new Loader(sel));
101 }
102
103 // Print diagnostic info when the test hangs
104 Runtime.getRuntime().addShutdownHook(new Thread() {
105 public void run() {
106 boolean alive = false;
107 for (Loader l : loaders) {
108 if (!l.isAlive()) continue;
109
110 if (!alive) {
111 System.out.println("Some threads are still alive:");
112 alive = true;
113 }
114
115 System.out.println(l.getName());
116 for (StackTraceElement elem : l.getStackTrace()) {
117 System.out.println("\t"+elem.toString());
118 }
119 }
120 }
121 });
122 }
123
124 public void run() throws Throwable {
125 init();
126 prepare();
127
128 for (Loader loader : loaders) {
129 loader.start();
130 }
131
132 l.await();
133
134 for (Loader loader : loaders) {
135 loader.join();
136 }
137 }
138
139 class Loader extends Thread {
140 List<String> classes;
141
142 public Loader(List<String> classes) {
143 this.classes = classes;
144 setDaemon(true);
145 }
146
147 @Override
148 public void run() {
149 try {
150 l.await();
151
152 for (String name : classes) {
153 Class.forName(name).getName();
154 }
155 } catch (ClassNotFoundException | BrokenBarrierException | InterruptedException e) {
156 throw new Error(e);
157 }
158 }
159 }
160
161 final static String[] classNames = {
162 "java.lang.invoke.AbstractValidatingLambdaMetafactory",
163 "java.lang.invoke.BoundMethodHandle",
164 "java.lang.invoke.CallSite",
165 "java.lang.invoke.ConstantCallSite",
166 "java.lang.invoke.DirectMethodHandle",
167 "java.lang.invoke.InnerClassLambdaMetafactory",
168 "java.lang.invoke.InvokeDynamic",
169 "java.lang.invoke.InvokeGeneric",
170 "java.lang.invoke.InvokerBytecodeGenerator",
171 "java.lang.invoke.Invokers",
172 "java.lang.invoke.LambdaConversionException",
173 "java.lang.invoke.LambdaForm",
174 "java.lang.invoke.LambdaMetafactory",
175 "java.lang.invoke.MemberName",
176 "java.lang.invoke.MethodHandle",
177 "java.lang.invoke.MethodHandleImpl",
178 "java.lang.invoke.MethodHandleInfo",
179 "java.lang.invoke.MethodHandleNatives",
180 "java.lang.invoke.MethodHandleProxies",
181 "java.lang.invoke.MethodHandles",
182 "java.lang.invoke.MethodHandleStatics",
183 "java.lang.invoke.MethodType",
184 "java.lang.invoke.MethodTypeForm",
185 "java.lang.invoke.MutableCallSite",
186 "java.lang.invoke.SerializedLambda",
187 "java.lang.invoke.SimpleMethodHandle",
188 "java.lang.invoke.SwitchPoint",
189 "java.lang.invoke.TypeConvertingMethodAdapter",
190 "java.lang.invoke.VolatileCallSite",
191 "java.lang.invoke.WrongMethodTypeException"
192 };
193 }