Count.java revision 0
0N/A/*
0N/A * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
0N/A * published by the Free Software Foundation.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
0N/A * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
0N/A * CA 95054 USA or visit www.sun.com if you need additional information or
0N/A * have any questions.
0N/A */
0N/A
0N/A/*
0N/A * @test
0N/A * @bug 6207928 6328220 6378321
0N/A * @summary Recursive lock invariant sanity checks
0N/A * @author Martin Buchholz
0N/A */
0N/A
0N/Aimport java.util.*;
0N/Aimport java.util.concurrent.*;
0N/Aimport java.util.concurrent.locks.*;
0N/A
0N/A// I am the Cownt, and I lahve to cownt.
0N/Apublic class Count {
0N/A private static void realMain(String[] args) throws Throwable {
0N/A final ReentrantLock rl = new ReentrantLock();
0N/A final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
0N/A final int depth = 10;
0N/A check(! rl.isLocked());
0N/A check(! rwl.isWriteLocked());
0N/A check(! rl.isHeldByCurrentThread());
0N/A check(! rwl.isWriteLockedByCurrentThread());
0N/A check(! rwl.writeLock().isHeldByCurrentThread());
0N/A
0N/A for (int i = 0; i < depth; i++) {
0N/A equal(rl.getHoldCount(), i);
0N/A equal(rwl.getReadLockCount(), i);
0N/A equal(rwl.getReadHoldCount(), i);
0N/A equal(rwl.getWriteHoldCount(), i);
0N/A equal(rwl.writeLock().getHoldCount(), i);
0N/A switch (i%4) {
0N/A case 0:
0N/A rl.lock();
0N/A rwl.writeLock().lock();
0N/A rwl.readLock().lock();
0N/A break;
0N/A case 1:
0N/A rl.lockInterruptibly();
0N/A rwl.writeLock().lockInterruptibly();
0N/A rwl.readLock().lockInterruptibly();
0N/A break;
0N/A case 2:
0N/A check(rl.tryLock());
0N/A check(rwl.writeLock().tryLock());
0N/A check(rwl.readLock().tryLock());
0N/A break;
0N/A case 3:
0N/A check(rl.tryLock(454, TimeUnit.MILLISECONDS));
0N/A check(rwl.writeLock().tryLock(454, TimeUnit.NANOSECONDS));
0N/A check(rwl.readLock().tryLock(454, TimeUnit.HOURS));
0N/A break;
0N/A }
0N/A }
0N/A
0N/A for (int i = depth; i > 0; i--) {
0N/A check(! rl.hasQueuedThreads());
0N/A check(! rwl.hasQueuedThreads());
0N/A check(! rl.hasQueuedThread(Thread.currentThread()));
0N/A check(! rwl.hasQueuedThread(Thread.currentThread()));
0N/A check(rl.isLocked());
0N/A check(rwl.isWriteLocked());
0N/A check(rl.isHeldByCurrentThread());
0N/A check(rwl.isWriteLockedByCurrentThread());
0N/A check(rwl.writeLock().isHeldByCurrentThread());
0N/A equal(rl.getQueueLength(), 0);
0N/A equal(rwl.getQueueLength(), 0);
0N/A equal(rwl.getReadLockCount(), i);
0N/A equal(rl.getHoldCount(), i);
0N/A equal(rwl.getReadHoldCount(), i);
0N/A equal(rwl.getWriteHoldCount(), i);
0N/A equal(rwl.writeLock().getHoldCount(), i);
0N/A rwl.readLock().unlock();
0N/A rwl.writeLock().unlock();
0N/A rl.unlock();
0N/A }
0N/A }
0N/A
0N/A //--------------------- Infrastructure ---------------------------
0N/A static volatile int passed = 0, failed = 0;
0N/A static void pass() {passed++;}
0N/A static void fail() {failed++; Thread.dumpStack();}
0N/A static void fail(String msg) {System.out.println(msg); fail();}
0N/A static void unexpected(Throwable t) {failed++; t.printStackTrace();}
0N/A static void check(boolean cond) {if (cond) pass(); else fail();}
0N/A static void equal(Object x, Object y) {
0N/A if (x == null ? y == null : x.equals(y)) pass();
0N/A else fail(x + " not equal to " + y);}
0N/A public static void main(String[] args) throws Throwable {
0N/A try {realMain(args);} catch (Throwable t) {unexpected(t);}
0N/A System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
0N/A if (failed > 0) throw new AssertionError("Some tests failed");}
0N/A}