| /* |
| * Copyright (c) 2007, 2010, 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 6571733 6460501 |
| * @summary Check that regaining a read lock succeeds after a write |
| * lock attempt times out |
| */ |
| |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.locks.ReentrantReadWriteLock; |
| |
| public class Bug6571733 { |
| |
| void test(String[] args) throws Throwable { |
| test(true); |
| test(false); |
| } |
| |
| void test(boolean fairness) throws Throwable { |
| final ReentrantReadWriteLock lock = new ReentrantReadWriteLock(fairness); |
| |
| // obtain read lock |
| lock.readLock().lock(); |
| |
| Thread thread = new Thread() { public void run() { |
| try { |
| check(! lock.writeLock().tryLock(0, TimeUnit.DAYS)); |
| |
| lock.readLock().lock(); |
| lock.readLock().unlock(); |
| } catch (Throwable t) { unexpected(t); }}}; |
| |
| thread.start(); |
| thread.join(); |
| } |
| |
| //--------------------- Infrastructure --------------------------- |
| volatile int passed = 0, failed = 0; |
| void pass() {passed++;} |
| void fail() {failed++; Thread.dumpStack();} |
| void fail(String msg) {System.err.println(msg); fail();} |
| void unexpected(Throwable t) {failed++; t.printStackTrace();} |
| void check(boolean cond) {if (cond) pass(); else fail();} |
| public static void main(String[] args) throws Throwable { |
| new Bug6571733().instanceMain(args);} |
| void instanceMain(String[] args) throws Throwable { |
| try {test(args);} catch (Throwable t) {unexpected(t);} |
| System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); |
| if (failed > 0) throw new AssertionError("Some tests failed");} |
| } |