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