test/java/util/concurrent/FutureTask/CancelledFutureLoops.java

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  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  */
  22 
  23 /*
  24  * This file is available under and governed by the GNU General Public
  25  * License version 2 only, as published by the Free Software Foundation.
  26  * However, the following notice accompanied the original version of this
  27  * file:
  28  *
  29  * Written by Doug Lea with assistance from members of JCP JSR-166
  30  * Expert Group and released to the public domain, as explained at
  31  * http://creativecommons.org/licenses/publicdomain
  32  */
  33 
  34 /*
  35  * @test
  36  * @bug 4486658
  37  * @compile CancelledFutureLoops.java
  38  * @run main/timeout=2000 CancelledFutureLoops
  39  * @summary Checks for responsiveness of futures to cancellation.
  40  * Runs under the assumption that ITERS computations require more than
  41  * TIMEOUT msecs to complete.
  42  */
  43 
  44 import java.util.concurrent.*;
  45 import java.util.concurrent.locks.*;
  46 import java.util.*;
  47 
  48 public final class CancelledFutureLoops {
  49     static final ExecutorService pool = Executors.newCachedThreadPool();
  50     static final LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom();
  51     static boolean print = false;
  52     static final int ITERS = 1000000;
  53     static final long TIMEOUT = 100;
  54 
  55     public static void main(String[] args) throws Exception {
  56         int maxThreads = 5;
  57         if (args.length > 0)
  58             maxThreads = Integer.parseInt(args[0]);
  59 
  60         print = true;
  61 
  62         for (int i = 2; i <= maxThreads; i += (i+1) >>> 1) {
  63             System.out.print("Threads: " + i);
  64             try {
  65                 new FutureLoop(i).test();
  66             }
  67             catch(BrokenBarrierException bb) {
  68                 // OK; ignore
  69             }
  70             catch(ExecutionException ee) {
  71                 // OK; ignore
  72             }
  73             Thread.sleep(TIMEOUT);
  74         }
  75         pool.shutdown();
  76         if (! pool.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS))
  77             throw new Error();
  78     }
  79 
  80     static final class FutureLoop implements Callable {
  81         private int v = rng.next();
  82         private final ReentrantLock lock = new ReentrantLock();
  83         private final LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
  84         private final CyclicBarrier barrier;
  85         private final int nthreads;
  86         FutureLoop(int nthreads) {
  87             this.nthreads = nthreads;
  88             barrier = new CyclicBarrier(nthreads+1, timer);
  89         }
  90 




  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  */
  22 
  23 /*
  24  * This file is available under and governed by the GNU General Public
  25  * License version 2 only, as published by the Free Software Foundation.
  26  * However, the following notice accompanied the original version of this
  27  * file:
  28  *
  29  * Written by Doug Lea with assistance from members of JCP JSR-166
  30  * Expert Group and released to the public domain, as explained at
  31  * http://creativecommons.org/licenses/publicdomain
  32  */
  33 
  34 /*
  35  * @test
  36  * @bug 4486658
  37  * @compile -source 1.5 CancelledFutureLoops.java
  38  * @run main/timeout=2000 CancelledFutureLoops
  39  * @summary Checks for responsiveness of futures to cancellation.
  40  * Runs under the assumption that ITERS computations require more than
  41  * TIMEOUT msecs to complete.
  42  */
  43 
  44 import java.util.concurrent.*;
  45 import java.util.concurrent.locks.*;
  46 import java.util.*;
  47 
  48 public final class CancelledFutureLoops {
  49     static final ExecutorService pool = Executors.newCachedThreadPool();
  50     static final LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom();
  51     static boolean print = false;
  52     static final int ITERS = 1000000;
  53     static final long TIMEOUT = 100;
  54 
  55     public static void main(String[] args) throws Exception {
  56         int maxThreads = 5;
  57         if (args.length > 0)
  58             maxThreads = Integer.parseInt(args[0]);
  59 
  60         print = true;
  61 
  62         for (int i = 2; i <= maxThreads; i += (i+1) >>> 1) {
  63             System.out.print("Threads: " + i);
  64             try {
  65                 new FutureLoop(i).test();
  66             }
  67             catch (BrokenBarrierException bb) {
  68                 // OK; ignore
  69             }
  70             catch (ExecutionException ee) {
  71                 // OK; ignore
  72             }
  73             Thread.sleep(TIMEOUT);
  74         }
  75         pool.shutdown();
  76         if (! pool.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS))
  77             throw new Error();
  78     }
  79 
  80     static final class FutureLoop implements Callable {
  81         private int v = rng.next();
  82         private final ReentrantLock lock = new ReentrantLock();
  83         private final LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
  84         private final CyclicBarrier barrier;
  85         private final int nthreads;
  86         FutureLoop(int nthreads) {
  87             this.nthreads = nthreads;
  88             barrier = new CyclicBarrier(nthreads+1, timer);
  89         }
  90