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/*

 * @test

 * @bug 6523756

 * @summary Race task submission against shutdownNow

 * @author Martin Buchholz

 */

// For extra chances to detect shutdownNow vs. execute races,

// crank up the iterations to, say 1<<22 and

// add a call to Thread.yield() before the call to t.start()

// in ThreadPoolExecutor.addWorker.

import java.util.*;

import java.util.concurrent.*;

public class ShutdownNowExecuteRace {

    static volatile boolean quit = false;

    static volatile ThreadPoolExecutor pool = null;

    static final Runnable sleeper = new Runnable() { public void run() {

        final long ONE_HOUR = 1000L * 60L * 60L;

        try { Thread.sleep(ONE_HOUR); }

        catch (InterruptedException ie) {}

        catch (Throwable t) { unexpected(t); }}};

    static void realMain(String[] args) throws Throwable {

        final int iterations = 1 << 8;

        Thread thread = new Thread() { public void run() {

            while (! quit) {

                ThreadPoolExecutor pool = ShutdownNowExecuteRace.pool;

                if (pool != null)

                    try { pool.execute(sleeper); }

                    catch (RejectedExecutionException e) {/* OK */}

                    catch (Throwable t) { unexpected(t); }}}};

        thread.start();

        for (int i = 0; i < iterations; i++) {

            pool = new ThreadPoolExecutor(

                10, 10, 3L, TimeUnit.DAYS,

                new ArrayBlockingQueue<Runnable>(10));

            pool.shutdownNow();

            check(pool.awaitTermination(3L, TimeUnit.MINUTES));

        }

        quit = true;

        thread.join();

    }

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

    static volatile int passed = 0, failed = 0;

    static void pass() {passed++;}

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

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

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

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

    static 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 {

        try {realMain(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");}

    private abstract static class Fun {abstract void f() throws Throwable;}

    static void THROWS(Class<? extends Throwable> k, Fun... fs) {

        for (Fun f : fs)

            try { f.f(); fail("Expected " + k.getName() + " not thrown"); }

            catch (Throwable t) {

                if (k.isAssignableFrom(t.getClass())) pass();

                else unexpected(t);}}

    private abstract static class CheckedThread extends Thread {

        abstract void realRun() throws Throwable;

        public void run() {

            try {realRun();} catch (Throwable t) {unexpected(t);}}}

}