106 lines
3.8 KiB
Java
106 lines
3.8 KiB
Java
/*
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* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8295278
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* @summary Call unlocked version loadClass directly, with another thread calling forName
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* One class goes through the ClassLoader path and the other goes through JVM path
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* @library /test/lib
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* @compile test-classes/A.java ../share/ThreadPrint.java
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* @run main/othervm CallLoadClassTest
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*/
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import jdk.test.lib.classloader.ClassUnloadCommon;
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import java.util.concurrent.Semaphore;
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public class CallLoadClassTest {
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private static Semaphore mainSync = null;
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private static class MyLoader extends ClassLoader {
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ClassLoader parent;
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int count;
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MyLoader(ClassLoader parent) {
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this.parent = parent;
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this.count = 0;
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}
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public synchronized Class<?> loadClass(String name) throws ClassNotFoundException {
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Class<?> loadedClass = findLoadedClass(name);
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if (name.equals("A") && loadedClass == null) {
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ThreadPrint.println("Loading A");
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if (count == 0) {
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count++;
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ThreadPrint.println("Waiting for A");
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try {
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mainSync.release(); // Let t2 start
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wait(); // let the other thread load A instead.
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} catch (InterruptedException ie) {
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}
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} else {
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notify(); // notify any waiting threads.
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}
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byte[] classfile = ClassUnloadCommon.getClassData("A");
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return defineClass(name, classfile, 0, classfile.length);
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} else {
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return parent.loadClass(name);
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}
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}
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}
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private static ClassLoadingThread[] threads = new ClassLoadingThread[2];
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private static boolean success = true;
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private static boolean report_success() {
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for (int i = 0; i < 2; i++) {
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try {
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threads[i].join();
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if (!threads[i].report_success()) success = false;
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} catch (InterruptedException e) {}
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}
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return success;
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}
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public static void main(java.lang.String[] unused) {
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mainSync = new Semaphore(0);
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// t1 does loadClass directly, t2 does class.ForName()
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ClassLoader appLoader = CallLoadClassTest.class.getClassLoader();
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MyLoader ldr = new MyLoader(appLoader);
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for (int i = 0; i < 2; i++) {
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threads[i] = new ClassLoadingThread(ldr, i, mainSync);
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threads[i].setName("Loading Thread #" + (i + 1));
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threads[i].start();
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System.out.println("Thread " + (i + 1) + " was started...");
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}
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if (report_success()) {
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System.out.println("PASSED");
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} else {
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throw new RuntimeException("FAILED");
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}
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}
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}
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