| /* |
| * Copyright 2005-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 6207928 6328220 6378321 |
| * @summary Recursive lock invariant sanity checks |
| * @author Martin Buchholz |
| */ |
| |
| import java.util.*; |
| import java.util.concurrent.*; |
| import java.util.concurrent.locks.*; |
| |
| // I am the Cownt, and I lahve to cownt. |
| public class Count { |
| private static void realMain(String[] args) throws Throwable { |
| final ReentrantLock rl = new ReentrantLock(); |
| final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock(); |
| final int depth = 10; |
| check(! rl.isLocked()); |
| check(! rwl.isWriteLocked()); |
| check(! rl.isHeldByCurrentThread()); |
| check(! rwl.isWriteLockedByCurrentThread()); |
| check(! rwl.writeLock().isHeldByCurrentThread()); |
| |
| for (int i = 0; i < depth; i++) { |
| equal(rl.getHoldCount(), i); |
| equal(rwl.getReadLockCount(), i); |
| equal(rwl.getReadHoldCount(), i); |
| equal(rwl.getWriteHoldCount(), i); |
| equal(rwl.writeLock().getHoldCount(), i); |
| switch (i%4) { |
| case 0: |
| rl.lock(); |
| rwl.writeLock().lock(); |
| rwl.readLock().lock(); |
| break; |
| case 1: |
| rl.lockInterruptibly(); |
| rwl.writeLock().lockInterruptibly(); |
| rwl.readLock().lockInterruptibly(); |
| break; |
| case 2: |
| check(rl.tryLock()); |
| check(rwl.writeLock().tryLock()); |
| check(rwl.readLock().tryLock()); |
| break; |
| case 3: |
| check(rl.tryLock(454, TimeUnit.MILLISECONDS)); |
| check(rwl.writeLock().tryLock(454, TimeUnit.NANOSECONDS)); |
| check(rwl.readLock().tryLock(454, TimeUnit.HOURS)); |
| break; |
| } |
| } |
| |
| for (int i = depth; i > 0; i--) { |
| check(! rl.hasQueuedThreads()); |
| check(! rwl.hasQueuedThreads()); |
| check(! rl.hasQueuedThread(Thread.currentThread())); |
| check(! rwl.hasQueuedThread(Thread.currentThread())); |
| check(rl.isLocked()); |
| check(rwl.isWriteLocked()); |
| check(rl.isHeldByCurrentThread()); |
| check(rwl.isWriteLockedByCurrentThread()); |
| check(rwl.writeLock().isHeldByCurrentThread()); |
| equal(rl.getQueueLength(), 0); |
| equal(rwl.getQueueLength(), 0); |
| equal(rwl.getReadLockCount(), i); |
| equal(rl.getHoldCount(), i); |
| equal(rwl.getReadHoldCount(), i); |
| equal(rwl.getWriteHoldCount(), i); |
| equal(rwl.writeLock().getHoldCount(), i); |
| rwl.readLock().unlock(); |
| rwl.writeLock().unlock(); |
| rl.unlock(); |
| } |
| } |
| |
| //--------------------- Infrastructure --------------------------- |
| static volatile int passed = 0, failed = 0; |
| static void pass() {passed++;} |
| static void fail() {failed++; Thread.dumpStack();} |
| static void fail(String msg) {System.out.println(msg); fail();} |
| static void unexpected(Throwable t) {failed++; t.printStackTrace();} |
| static void check(boolean cond) {if (cond) pass(); else fail();} |
| static void equal(Object x, Object y) { |
| if (x == null ? y == null : x.equals(y)) pass(); |
| else fail(x + " not equal to " + y);} |
| public static void main(String[] args) throws Throwable { |
| try {realMain(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");} |
| } |