/*

 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

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 */

/*

 * 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/licenses/publicdomain

 */

/*

 * @test

 * @bug 6445158

 * @summary tests for Phaser.arrive()

 */

import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.Phaser;

import java.util.concurrent.ThreadLocalRandom;

import java.util.concurrent.atomic.AtomicInteger;

public class Arrive {

    void test(String[] args) throws Throwable {

        final int n = ThreadLocalRandom.current().nextInt(1, 10);

        final int nthreads = n*3/2;

        final Phaser startingGate = new Phaser(nthreads);

        final Phaser phaser = new Phaser(n);

        final List<Thread> threads = new ArrayList<Thread>();

        final AtomicInteger count0 = new AtomicInteger(0);

        final AtomicInteger count1 = new AtomicInteger(0);

        final Runnable task = new Runnable() { public void run() {

            equal(startingGate.getPhase(), 0);

            startingGate.arriveAndAwaitAdvance();

            equal(startingGate.getPhase(), 1);

            int phase = phaser.arrive();

            if (phase == 0)

                count0.getAndIncrement();

            else if (phase == 1)

                count1.getAndIncrement();

            else

                fail();

        }};

        for (int i = 0; i < nthreads; i++)

            threads.add(new Thread(task));

        for (Thread thread : threads)

            thread.start();

        for (Thread thread : threads)

            thread.join();

        equal(count0.get(), n);

        equal(count1.get(), nthreads-n);

        equal(phaser.getPhase(), 1);

    }

    //--------------------- Infrastructure ---------------------------

    volatile int passed = 0, failed = 0;

    void pass() {passed++;}

    void fail() {failed++; Thread.dumpStack();}

    void fail(String msg) {System.err.println(msg); fail();}

    void unexpected(Throwable t) {failed++; t.printStackTrace();}

    void check(boolean cond) {if (cond) pass(); else fail();}

    void equal(Object x, Object y) {

        if (x == null ? y == null : x.equals(y)) pass();

        else fail(x + " not equal to " + y);}

    public static void main(String[] args) throws Throwable {

        new Arrive().instanceMain(args);}

    public void instanceMain(String[] args) throws Throwable {

        try {test(args);} catch (Throwable t) {unexpected(t);}

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

        if (failed > 0) throw new AssertionError("Some tests failed");}

}