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