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 register/arriveAndDeregister
37 * @run main FickleRegister 300
38 */
39
40import java.util.ArrayList;
41import java.util.concurrent.Phaser;
42import java.util.concurrent.atomic.AtomicLong;
43
44public class FickleRegister {
45    final AtomicLong count = new AtomicLong(0);
46    final long testDurationMillisDefault = 10L * 1000L;
47    final long testDurationMillis;
48    final long quittingTimeNanos;
49    final int chunkSize = 1000;
50
51    FickleRegister(String[] args) {
52        testDurationMillis = (args.length > 0) ?
53            Long.valueOf(args[0]) : testDurationMillisDefault;
54        quittingTimeNanos = System.nanoTime() +
55            testDurationMillis * 1000L * 1000L;
56    }
57
58    class Runner extends CheckedRunnable {
59        final Phaser p;
60        Runner(Phaser phaser) { p = phaser; }
61        public void realRun() {
62            int prevPhase = -1;
63            for (int k = 1;; k++) {
64                for (int i = 0; i < chunkSize; i++) {
65                    int phase = p.register();
66                    if (phase < 0) break;
67                    check(phase > prevPhase);
68                    prevPhase = phase;
69                    equal(phase, p.arriveAndDeregister());
70                    check(phase < p.awaitAdvance(phase));
71                }
72                if (System.nanoTime() - quittingTimeNanos > 0) {
73                    count.getAndAdd(k * chunkSize);
74                    break;
75                }
76            }
77        }
78    }
79
80    void test(String[] args) throws Throwable {
81        final Phaser parent = new Phaser() {
82                protected boolean onAdvance(int phase, int parties) {
83                    return false;
84                }
85            };
86
87        final Phaser child1 = new Phaser(parent);
88        final Phaser child2 = new Phaser(parent);
89        final Phaser subchild1 = new Phaser(child1);
90        final Phaser subchild2 = new Phaser(child2);
91        final Phaser[] phasers = {
92            parent, child1, child2, subchild1, subchild2
93        };
94
95        int reps = 4;
96        ArrayList<Thread> threads = new ArrayList<>();
97        for (int j = 0; j < reps; ++j) {
98            threads.add(new Thread(new Runner(subchild1)));
99            threads.add(new Thread(new Runner(child1)));
100            threads.add(new Thread(new Runner(parent)));
101            threads.add(new Thread(new Runner(child2)));
102            threads.add(new Thread(new Runner(subchild2)));
103        }
104
105        for (Thread thread : threads)
106            thread.start();
107
108        for (Thread thread : threads)
109            thread.join();
110
111        System.out.println("Parent:    " + parent);
112        System.out.println("Child1:    " + child1);
113        System.out.println("Child2:    " + child2);
114        System.out.println("Subchild1: " + subchild1);
115        System.out.println("Subchild2: " + subchild2);
116        System.out.println("Iterations:" + count.get());
117
118        for (Phaser phaser : phasers) {
119            check(phaser.getPhase() > 0);
120            equal(0, phaser.getRegisteredParties());
121            equal(0, phaser.getUnarrivedParties());
122            equal(parent.getPhase(), phaser.getPhase());
123        }
124    }
125
126    //--------------------- Infrastructure ---------------------------
127    volatile int passed = 0, failed = 0;
128    void pass() {passed++;}
129    void fail() {failed++; Thread.dumpStack();}
130    void fail(String msg) {System.err.println(msg); fail();}
131    void unexpected(Throwable t) {failed++; t.printStackTrace();}
132    void check(boolean cond) {if (cond) pass(); else fail();}
133    void equal(Object x, Object y) {
134        if (x == null ? y == null : x.equals(y)) pass();
135        else fail(x + " not equal to " + y);}
136    public static void main(String[] args) throws Throwable {
137        new FickleRegister(args).instanceMain(args);}
138    public void instanceMain(String[] args) throws Throwable {
139        try {test(args);} catch (Throwable t) {unexpected(t);}
140        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
141        if (failed > 0) throw new AssertionError("Some tests failed");}
142
143    abstract class CheckedRunnable implements Runnable {
144        protected abstract void realRun() throws Throwable;
145
146        public final void run() {
147            try {realRun();} catch (Throwable t) {unexpected(t);}
148        }
149    }
150}
151