df5da31f55
6493942: ConcurrentLinkedQueue.remove sometimes very slow New algorithm for handling concurrent linked lists Reviewed-by: martin
102 lines
4.1 KiB
Java
102 lines
4.1 KiB
Java
/*
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* Copyright 2005-2008 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 6316155 6595669
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* @summary Test concurrent offer vs. remove
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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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public class OfferRemoveLoops {
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void test(String[] args) throws Throwable {
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testQueue(new LinkedBlockingQueue<String>(10));
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testQueue(new LinkedBlockingQueue<String>());
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testQueue(new LinkedBlockingDeque<String>(10));
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testQueue(new LinkedBlockingDeque<String>());
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testQueue(new ArrayBlockingQueue<String>(10));
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testQueue(new PriorityBlockingQueue<String>(10));
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testQueue(new ConcurrentLinkedQueue<String>());
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}
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abstract class CheckedThread extends Thread {
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abstract protected void realRun();
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public void run() {
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try { realRun(); } catch (Throwable t) { unexpected(t); }
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}
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}
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void testQueue(final Queue<String> q) throws Throwable {
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System.out.println(q.getClass().getSimpleName());
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final int count = 1000 * 1000;
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final long testDurationSeconds = 1L;
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final long testDurationMillis = testDurationSeconds * 1000L;
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final long quittingTimeNanos
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= System.nanoTime() + testDurationSeconds * 1000L * 1000L * 1000L;
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Thread t1 = new CheckedThread() {
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protected void realRun() {
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for (int i = 0; i < count; i++) {
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if ((i % 1024) == 0 &&
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System.nanoTime() - quittingTimeNanos > 0)
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return;
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while (! q.remove(String.valueOf(i)))
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Thread.yield();
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}}};
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Thread t2 = new CheckedThread() {
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protected void realRun() {
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for (int i = 0; i < count; i++) {
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if ((i % 1024) == 0 &&
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System.nanoTime() - quittingTimeNanos > 0)
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return;
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while (! q.offer(String.valueOf(i)))
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Thread.yield();
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}}};
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t1.setDaemon(true); t2.setDaemon(true);
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t1.start(); t2.start();
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t1.join(10 * testDurationMillis);
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t2.join(10 * testDurationMillis);
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check(! t1.isAlive());
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check(! t2.isAlive());
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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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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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new OfferRemoveLoops().instanceMain(args);}
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public 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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