d43e798981
6815766: LinkedBlockingQueue's iterator can return null if drainTo(c) executes concurrently Faster, more correct. Use self-linking trick to avoid gc retention Reviewed-by: martin, dholmes
131 lines
4.8 KiB
Java
131 lines
4.8 KiB
Java
/*
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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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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Written by Doug Lea with assistance from members of JCP JSR-166
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* Expert Group and released to the public domain, as explained at
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* http://creativecommons.org/licenses/publicdomain
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*/
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/*
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* @test
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* @bug 6805775 6815766
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* @summary Test concurrent offer vs. drainTo
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*/
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import java.util.*;
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import java.util.concurrent.*;
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@SuppressWarnings({"unchecked", "rawtypes"})
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public class OfferDrainToLoops {
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void checkNotContainsNull(Iterable it) {
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for (Object x : it)
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check(x != null);
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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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setDaemon(true);
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start();
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}
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}
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void test(String[] args) throws Throwable {
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test(new LinkedBlockingQueue());
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test(new LinkedBlockingQueue(2000));
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test(new LinkedBlockingDeque());
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test(new LinkedBlockingDeque(2000));
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test(new ArrayBlockingQueue(2000));
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}
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void test(final BlockingQueue q) throws Throwable {
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System.out.println(q.getClass().getSimpleName());
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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 offerer = new CheckedThread() {
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protected void realRun() {
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for (long i = 0; ; i++) {
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if ((i % 1024) == 0 &&
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System.nanoTime() - quittingTimeNanos > 0)
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break;
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while (! q.offer(i))
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Thread.yield();
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}}};
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Thread drainer = new CheckedThread() {
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protected void realRun() {
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for (long i = 0; ; i++) {
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if (System.nanoTime() - quittingTimeNanos > 0)
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break;
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List list = new ArrayList();
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int n = q.drainTo(list);
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equal(list.size(), n);
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for (int j = 0; j < n - 1; j++)
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equal((Long) list.get(j) + 1L, list.get(j + 1));
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Thread.yield();
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}}};
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Thread scanner = new CheckedThread() {
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protected void realRun() {
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for (long i = 0; ; i++) {
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if (System.nanoTime() - quittingTimeNanos > 0)
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break;
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checkNotContainsNull(q);
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Thread.yield();
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}}};
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offerer.join(10 * testDurationMillis);
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drainer.join(10 * testDurationMillis);
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check(! offerer.isAlive());
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check(! drainer.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 OfferDrainToLoops().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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