116 lines
3.9 KiB
Java
116 lines
3.9 KiB
Java
/*
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* Copyright (c) 2015, 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 8143394
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* @summary Check for NullPointerException in race between read() and close().
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*/
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import java.io.CharArrayReader;
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import java.io.IOException;
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import java.io.PushbackReader;
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import java.io.Reader;
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import java.io.StringReader;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.concurrent.atomic.AtomicReference;
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import java.util.function.Supplier;
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public class ReadCloseRaceNPE {
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private static final int BUF_SIZE = 1000;
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private static final long TIMEOUT_MS = 3000;
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private static final List<Exception> failures = new ArrayList<>();
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private static void testReader(final Supplier<Reader> readerSupplier)
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throws InterruptedException {
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AtomicReference<Reader> readerRef =
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new AtomicReference<>(readerSupplier.get());
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AtomicBoolean isFinished = new AtomicBoolean();
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Runnable readTask = () -> {
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long startTime = System.currentTimeMillis();
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while (System.currentTimeMillis() - startTime < TIMEOUT_MS) {
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try {
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readerRef.get().read();
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} catch (Exception e) {
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if (!(e instanceof IOException)) {
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failures.add(e);
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break;
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}
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readerRef.set(readerSupplier.get());
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}
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}
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isFinished.set(true);
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};
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Runnable closeTask = () -> {
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while (!isFinished.get()) {
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try {
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readerRef.get().close();
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} catch (Exception e) {
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if (!(e instanceof IOException)) {
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e.printStackTrace();
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}
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}
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}
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};
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Thread readThread = new Thread(readTask);
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Thread closeThread = new Thread(closeTask);
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readThread.start();
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closeThread.start();
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readThread.join();
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closeThread.join();
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}
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public static void main(String[] args) throws Throwable {
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final String s = "Two riders were approaching.\\n";
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Supplier<Reader> charPushbackReaderSupplier = () -> {
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char buf[] = new char[s.length()];
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s.getChars(0, s.length(), buf, 0);
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CharArrayReader in = new CharArrayReader(buf);
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return new PushbackReader(in, BUF_SIZE);
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};
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testReader(charPushbackReaderSupplier);
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Supplier<Reader> stringPushbackReaderSupplier = () -> {
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StringReader in = new StringReader(s);
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return new PushbackReader(in, BUF_SIZE);
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};
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testReader(stringPushbackReaderSupplier);
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if (!failures.isEmpty()) {
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failures.stream().forEach((x) -> ((Exception) x).printStackTrace());
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throw new RuntimeException("PushbackReaderNPE failed");
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}
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}
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}
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