| /* |
| * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * This file is available under and governed by the GNU General Public |
| * License version 2 only, as published by the Free Software Foundation. |
| * However, the following notice accompanied the original version of this |
| * file: |
| * |
| * Written by Doug Lea with assistance from members of JCP JSR-166 |
| * Expert Group and released to the public domain, as explained at |
| * http://creativecommons.org/publicdomain/zero/1.0/ |
| */ |
| |
| /* |
| * @test |
| * @bug 6805775 6815766 |
| * @run main OfferDrainToLoops 100 |
| * @summary Test concurrent offer vs. drainTo |
| */ |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.SplittableRandom; |
| import java.util.concurrent.ArrayBlockingQueue; |
| import java.util.concurrent.BlockingQueue; |
| import java.util.concurrent.LinkedBlockingDeque; |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.concurrent.LinkedTransferQueue; |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| @SuppressWarnings({"unchecked", "rawtypes", "deprecation"}) |
| public class OfferDrainToLoops { |
| final long testDurationMillisDefault = 10L * 1000L; |
| final long testDurationMillis; |
| |
| OfferDrainToLoops(String[] args) { |
| testDurationMillis = (args.length > 0) ? |
| Long.valueOf(args[0]) : testDurationMillisDefault; |
| } |
| |
| void checkNotContainsNull(Iterable it) { |
| for (Object x : it) |
| check(x != null); |
| } |
| |
| void test(String[] args) throws Throwable { |
| test(new LinkedBlockingQueue()); |
| test(new LinkedBlockingQueue(2000)); |
| test(new LinkedBlockingDeque()); |
| test(new LinkedBlockingDeque(2000)); |
| test(new ArrayBlockingQueue(2000)); |
| test(new LinkedTransferQueue()); |
| } |
| |
| void test(final BlockingQueue q) throws Throwable { |
| System.out.println(q.getClass().getSimpleName()); |
| final long testDurationNanos = testDurationMillis * 1000L * 1000L; |
| final long quittingTimeNanos = System.nanoTime() + testDurationNanos; |
| final long timeoutMillis = 10L * 1000L; |
| final SplittableRandom rnd = new SplittableRandom(); |
| |
| /** Poor man's bounded buffer. */ |
| final AtomicLong approximateCount = new AtomicLong(0L); |
| |
| abstract class CheckedThread extends Thread { |
| final SplittableRandom rnd; |
| |
| CheckedThread(String name, SplittableRandom rnd) { |
| super(name); |
| this.rnd = rnd; |
| setDaemon(true); |
| start(); |
| } |
| /** Polls for quitting time. */ |
| protected boolean quittingTime() { |
| return System.nanoTime() - quittingTimeNanos > 0; |
| } |
| /** Polls occasionally for quitting time. */ |
| protected boolean quittingTime(long i) { |
| return (i % 1024) == 0 && quittingTime(); |
| } |
| protected abstract void realRun(); |
| public void run() { |
| try { realRun(); } catch (Throwable t) { unexpected(t); } |
| } |
| } |
| |
| Thread offerer = new CheckedThread("offerer", rnd.split()) { |
| protected void realRun() { |
| long c = 0; |
| for (long i = 0; ! quittingTime(i); i++) { |
| if (q.offer(c)) { |
| if ((++c % 1024) == 0) { |
| approximateCount.getAndAdd(1024); |
| while (approximateCount.get() > 10000) |
| Thread.yield(); |
| } |
| } else { |
| Thread.yield(); |
| }}}}; |
| |
| Thread drainer = new CheckedThread("drainer", rnd.split()) { |
| protected void realRun() { |
| while (! quittingTime()) { |
| List list = new ArrayList(); |
| int n = rnd.nextBoolean() ? |
| q.drainTo(list) : |
| q.drainTo(list, 100); |
| approximateCount.getAndAdd(-n); |
| equal(list.size(), n); |
| for (int j = 0; j < n - 1; j++) |
| equal((Long) list.get(j) + 1L, list.get(j + 1)); |
| Thread.yield(); |
| } |
| q.clear(); |
| approximateCount.set(0); // Releases waiting offerer thread |
| }}; |
| |
| Thread scanner = new CheckedThread("scanner", rnd.split()) { |
| protected void realRun() { |
| while (! quittingTime()) { |
| switch (rnd.nextInt(3)) { |
| case 0: checkNotContainsNull(q); break; |
| case 1: q.size(); break; |
| case 2: |
| Long[] a = (Long[]) q.toArray(new Long[0]); |
| int n = a.length; |
| for (int j = 0; j < n - 1; j++) { |
| check(a[j] < a[j+1]); |
| check(a[j] != null); |
| } |
| break; |
| } |
| Thread.yield(); |
| }}}; |
| |
| for (Thread thread : new Thread[] { offerer, drainer, scanner }) { |
| thread.join(timeoutMillis + testDurationMillis); |
| if (thread.isAlive()) { |
| System.err.printf("Hung thread: %s%n", thread.getName()); |
| failed++; |
| for (StackTraceElement e : thread.getStackTrace()) |
| System.err.println(e); |
| thread.join(timeoutMillis); |
| } |
| } |
| } |
| |
| //--------------------- Infrastructure --------------------------- |
| volatile int passed = 0, failed = 0; |
| void pass() {passed++;} |
| void fail() {failed++; Thread.dumpStack();} |
| void fail(String msg) {System.err.println(msg); fail();} |
| void unexpected(Throwable t) {failed++; t.printStackTrace();} |
| void check(boolean cond) {if (cond) pass(); else fail();} |
| 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 { |
| new OfferDrainToLoops(args).instanceMain(args);} |
| public void instanceMain(String[] args) throws Throwable { |
| try {test(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");} |
| } |