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 
TieredArriveLoops(String[] args)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 
runner(final Phaser p)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;
pass()95     void pass() {passed++;}
fail()96     void fail() {failed++; Thread.dumpStack();}
fail(String msg)97     void fail(String msg) {System.err.println(msg); fail();}
unexpected(Throwable t)98     void unexpected(Throwable t) {failed++; t.printStackTrace();}
check(boolean cond)99     void check(boolean cond) {if (cond) pass(); else fail();}
equal(Object x, Object y)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);}
main(String[] args)103     public static void main(String[] args) throws Throwable {
104         new TieredArriveLoops(args).instanceMain(args);}
instanceMain(String[] 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 {
realRun()111         protected abstract void realRun() throws Throwable;
112 
run()113         public final void run() {
114             try {realRun();} catch (Throwable t) {unexpected(t);}
115         }
116     }
117 }
118