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/jdk.internal.misc
30 * java.management
31 *
32 * @run main/othervm compiler.jsr292.ConcurrentClassLoadingTest
33 */
34
35 package compiler.jsr292;
36
37 import jdk.test.lib.Utils;
38
39 import java.util.ArrayList;
40 import java.util.Arrays;
41 import java.util.List;
42 import java.util.Random;
43 import java.util.concurrent.BrokenBarrierException;
44 import java.util.concurrent.CyclicBarrier;
45
46 public class ConcurrentClassLoadingTest {
47 int numThreads = 0;
48 CyclicBarrier l;
49 private static final Random rand = Utils.getRandomInstance();
50
51 public static void main(String[] args) throws Throwable {
52 ConcurrentClassLoadingTest test = new ConcurrentClassLoadingTest();
53 test.parseArgs(args);
54 test.run();
55 }
56
57 void parseArgs(String[] args) {
58 int i = 0;
59 while (i < args.length) {
60 String flag = args[i];
61 switch(flag) {
62 case "-numThreads":
63 numThreads = Integer.parseInt(args[++i]);
64 break;
65 default:
66 throw new Error("Unknown flag: " + flag);
67 }
68 ++i;
69 }
70 }
71
72 void init() {
73 if (numThreads == 0) {
74 numThreads = Runtime.getRuntime().availableProcessors();
75 }
76
77 l = new CyclicBarrier(numThreads + 1);
78
79 System.out.printf("Threads: %d\n", numThreads);
80 }
81
82 final List<Loader> loaders = new ArrayList<>();
83
84 void prepare() {
85 List<String> c = new ArrayList<>(Arrays.asList(classNames));
86
87 // Split classes between loading threads
88 int count = (classNames.length / numThreads) + 1;
89 for (int t = 0; t < numThreads; t++) {
90 List<String> sel = new ArrayList<>();
91
92 System.out.printf("Thread #%d:\n", t);
93 for (int i = 0; i < count; i++) {
94 if (c.isEmpty()) {
95 break;
96 }
97
98 int k = rand.nextInt(c.size());
99 String elem = c.remove(k);
100 sel.add(elem);
101 System.out.printf("\t%s\n", elem);
102 }
103 loaders.add(new Loader(sel));
104 }
105
106 // Print diagnostic info when the test hangs
107 Runtime.getRuntime().addShutdownHook(new Thread() {
108 public void run() {
109 boolean alive = false;
110 for (Loader l : loaders) {
111 if (!l.isAlive()) continue;
112
113 if (!alive) {
114 System.out.println("Some threads are still alive:");
115 alive = true;
116 }
117
118 System.out.println(l.getName());
119 for (StackTraceElement elem : l.getStackTrace()) {
120 System.out.println("\t"+elem.toString());
121 }
122 }
123 }
124 });
125 }
126
127 public void run() throws Throwable {
128 init();
129 prepare();
130
131 for (Loader loader : loaders) {
132 loader.start();
133 }
134
135 l.await();
136
137 for (Loader loader : loaders) {
138 loader.join();
139 }
140 }
141
142 class Loader extends Thread {
143 List<String> classes;
144
145 public Loader(List<String> classes) {
146 this.classes = classes;
147 setDaemon(true);
148 }
149
150 @Override
151 public void run() {
152 try {
153 l.await();
154
155 for (String name : classes) {
156 Class.forName(name).getName();
157 }
158 } catch (ClassNotFoundException | BrokenBarrierException | InterruptedException e) {
159 throw new Error(e);
160 }
161 }
162 }
163
164 final static String[] classNames = {
165 "java.lang.invoke.CallSite",
166 "java.lang.invoke.ConstantCallSite",
167 "java.lang.invoke.LambdaConversionException",
168 "java.lang.invoke.LambdaMetafactory",
169 "java.lang.invoke.MethodHandle",
170 "java.lang.invoke.MethodHandleInfo",
171 "java.lang.invoke.MethodHandleProxies",
172 "java.lang.invoke.MethodHandles",
173 "java.lang.invoke.MethodType",
174 "java.lang.invoke.MutableCallSite",
175 "java.lang.invoke.SerializedLambda",
176 "java.lang.invoke.SwitchPoint",
177 "java.lang.invoke.VolatileCallSite",
178 "java.lang.invoke.WrongMethodTypeException"
179 };
180 }