1 /*
   2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  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/publicdomain/zero/1.0/
  32  */
  33 
  34 /*
  35  * @test
  36  * @summary stress test for arrivals in a tiered phaser
  37  * @run main TieredArriveLoops 300
  38  */
  39 
  40 import java.util.concurrent.Phaser;
  41 
  42 public class TieredArriveLoops {
  43     final long testDurationMillisDefault = 10_000L;
  44     final long testDurationMillis;
  45     final long quittingTimeNanos;
  46 
  47     TieredArriveLoops(String[] args) {
  48         testDurationMillis = (args.length > 0) ?
  49             Long.valueOf(args[0]) : testDurationMillisDefault;
  50         quittingTimeNanos = System.nanoTime() +
  51             testDurationMillis * 1000L * 1000L;
  52     }
  53 
  54     Runnable runner(final Phaser p) {
  55         return new CheckedRunnable() { public void realRun() {
  56             int prevPhase = p.register();
  57             while (!p.isTerminated()) {
  58                 int phase = p.awaitAdvance(p.arrive());
  59                 if (phase < 0)
  60                     return;
  61                 equal(phase, (prevPhase + 1) & Integer.MAX_VALUE);
  62                 int ph = p.getPhase();
  63                 check(ph < 0 || ph == phase);
  64                 prevPhase = phase;
  65             }
  66         }};
  67     }
  68 
  69     void test(String[] args) throws Throwable {
  70         final Phaser parent = new Phaser();
  71         final Phaser child1 = new Phaser(parent);
  72         final Phaser child2 = new Phaser(parent);
  73 
  74         Thread t1 = new Thread(runner(child1));
  75         Thread t2 = new Thread(runner(child2));
  76         t1.start();
  77         t2.start();
  78 
  79         for (int prevPhase = 0, phase; ; prevPhase = phase) {
  80             phase = child2.getPhase();
  81             check(phase >= prevPhase);
  82             if (System.nanoTime() - quittingTimeNanos > 0) {
  83                 System.err.printf("phase=%d%n", phase);
  84                 child1.forceTermination();
  85                 break;
  86             }
  87         }
  88 
  89         t1.join();
  90         t2.join();
  91     }
  92 
  93     //--------------------- Infrastructure ---------------------------
  94     volatile int passed = 0, failed = 0;
  95     void pass() {passed++;}
  96     void fail() {failed++; Thread.dumpStack();}
  97     void fail(String msg) {System.err.println(msg); fail();}
  98     void unexpected(Throwable t) {failed++; t.printStackTrace();}
  99     void check(boolean cond) {if (cond) pass(); else fail();}
 100     void equal(Object x, Object y) {
 101         if (x == null ? y == null : x.equals(y)) pass();
 102         else fail(x + " not equal to " + y);}
 103     public static void main(String[] args) throws Throwable {
 104         new TieredArriveLoops(args).instanceMain(args);}
 105     public void instanceMain(String[] args) throws Throwable {
 106         try {test(args);} catch (Throwable t) {unexpected(t);}
 107         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
 108         if (failed > 0) throw new AssertionError("Some tests failed");}
 109 
 110     abstract class CheckedRunnable implements Runnable {
 111         protected abstract void realRun() throws Throwable;
 112 
 113         public final void run() {
 114             try {realRun();} catch (Throwable t) {unexpected(t);}
 115         }
 116     }
 117 }