| /* |
| * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 8143394 |
| * @summary Check for NullPointerException in race between read() and close(). |
| */ |
| import java.io.CharArrayReader; |
| import java.io.IOException; |
| import java.io.PushbackReader; |
| import java.io.Reader; |
| import java.io.StringReader; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.concurrent.atomic.AtomicReference; |
| import java.util.function.Supplier; |
| |
| public class ReadCloseRaceNPE { |
| |
| private static final int BUF_SIZE = 1000; |
| private static final long TIMEOUT_MS = 3000; |
| |
| private static final List<Exception> failures = new ArrayList<>(); |
| |
| private static void testReader(final Supplier<Reader> readerSupplier) |
| throws InterruptedException { |
| AtomicReference<Reader> readerRef = |
| new AtomicReference<>(readerSupplier.get()); |
| |
| AtomicBoolean isFinished = new AtomicBoolean(); |
| |
| Runnable readTask = () -> { |
| long startTime = System.currentTimeMillis(); |
| while (System.currentTimeMillis() - startTime < TIMEOUT_MS) { |
| try { |
| readerRef.get().read(); |
| } catch (Exception e) { |
| if (!(e instanceof IOException)) { |
| failures.add(e); |
| break; |
| } |
| readerRef.set(readerSupplier.get()); |
| } |
| } |
| isFinished.set(true); |
| }; |
| |
| Runnable closeTask = () -> { |
| while (!isFinished.get()) { |
| try { |
| readerRef.get().close(); |
| } catch (Exception e) { |
| if (!(e instanceof IOException)) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| }; |
| |
| Thread readThread = new Thread(readTask); |
| Thread closeThread = new Thread(closeTask); |
| |
| readThread.start(); |
| closeThread.start(); |
| readThread.join(); |
| closeThread.join(); |
| } |
| |
| public static void main(String[] args) throws Throwable { |
| final String s = "Two riders were approaching.\\n"; |
| |
| Supplier<Reader> charPushbackReaderSupplier = () -> { |
| char buf[] = new char[s.length()]; |
| s.getChars(0, s.length(), buf, 0); |
| CharArrayReader in = new CharArrayReader(buf); |
| return new PushbackReader(in, BUF_SIZE); |
| }; |
| |
| testReader(charPushbackReaderSupplier); |
| |
| Supplier<Reader> stringPushbackReaderSupplier = () -> { |
| StringReader in = new StringReader(s); |
| return new PushbackReader(in, BUF_SIZE); |
| }; |
| |
| testReader(stringPushbackReaderSupplier); |
| |
| if (!failures.isEmpty()) { |
| failures.stream().forEach((x) -> ((Exception) x).printStackTrace()); |
| throw new RuntimeException("PushbackReaderNPE failed"); |
| } |
| } |
| } |