| /* |
| * 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 4486658 |
| * @summary Checks for missed signals by locking and unlocking each of an array of locks once per thread |
| * @library /lib/testlibrary/ |
| */ |
| |
| import static java.util.concurrent.TimeUnit.MILLISECONDS; |
| |
| import java.util.concurrent.CyclicBarrier; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ThreadLocalRandom; |
| import java.util.concurrent.locks.ReentrantLock; |
| import jdk.testlibrary.Utils; |
| |
| public final class LockOncePerThreadLoops { |
| static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000); |
| static final ExecutorService pool = Executors.newCachedThreadPool(); |
| static boolean print = false; |
| static int nlocks = 20_000; |
| static int nthreads = 20; |
| static int replications = 3; |
| |
| public static void main(String[] args) throws Exception { |
| if (args.length > 0) |
| replications = Integer.parseInt(args[0]); |
| |
| if (args.length > 1) |
| nlocks = Integer.parseInt(args[1]); |
| |
| print = true; |
| |
| for (int i = 0; i < replications; ++i) { |
| System.out.print("Iteration: " + i); |
| new ReentrantLockLoop().test(); |
| } |
| pool.shutdown(); |
| if (! pool.awaitTermination(LONG_DELAY_MS, MILLISECONDS)) |
| throw new Error(); |
| } |
| |
| static final class ReentrantLockLoop implements Runnable { |
| private int v = ThreadLocalRandom.current().nextInt(); |
| private volatile int result = 17; |
| final ReentrantLock[]locks = new ReentrantLock[nlocks]; |
| |
| private final ReentrantLock lock = new ReentrantLock(); |
| private final LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer(); |
| private final CyclicBarrier barrier; |
| ReentrantLockLoop() { |
| barrier = new CyclicBarrier(nthreads+1, timer); |
| for (int i = 0; i < nlocks; ++i) |
| locks[i] = new ReentrantLock(); |
| } |
| |
| final void test() throws Exception { |
| for (int i = 0; i < nthreads; ++i) |
| pool.execute(this); |
| barrier.await(); |
| barrier.await(); |
| if (print) { |
| long time = timer.getTime(); |
| double secs = (double)(time) / 1000000000.0; |
| System.out.println("\t " + secs + "s run time"); |
| } |
| |
| int r = result; |
| if (r == 0) // avoid overoptimization |
| System.out.println("useless result: " + r); |
| } |
| |
| public final void run() { |
| try { |
| barrier.await(); |
| int sum = v; |
| int x = 0; |
| for (int i = 0; i < locks.length; ++i) { |
| locks[i].lock(); |
| try { |
| v = x += ~(v - i); |
| } |
| finally { |
| locks[i].unlock(); |
| } |
| // Once in a while, do something more expensive |
| if ((~i & 255) == 0) { |
| sum += LoopHelpers.compute1(LoopHelpers.compute2(x)); |
| } |
| else |
| sum += sum ^ x; |
| } |
| barrier.await(); |
| result += sum; |
| } |
| catch (Exception ex) { |
| return; |
| } |
| } |
| } |
| |
| } |