Examples with ForkJoinPool java8.util.concurrent.ForkJoinPool used on opensource projects

Example 41 with ForkJoinPool

use of java8.util.concurrent.ForkJoinPool in project streamsupport by stefan-zobel.

the class SubmissionTest method main.

public static void main(String[] args) {
    final ForkJoinPool e = new ForkJoinPool(1);
    final AtomicBoolean b = new AtomicBoolean();
    final Runnable setFalse = () -> b.set(false);
    for (int i = 0; i < 30_000; i++) {
        b.set(true);
        e.execute(setFalse);
        long startTime = System.nanoTime();
        while (b.get()) {
            if (millisElapsedSince(startTime) >= LONG_DELAY_MS) {
                throw new RuntimeException("Submitted task failed to execute");
            }
            Thread.yield();
        }
    }
}

Example 42 with ForkJoinPool

use of java8.util.concurrent.ForkJoinPool in project streamsupport by stefan-zobel.

the class CustomFJPoolTest method testCustomPools.

public void testCustomPools() throws Exception {
    int splitsForP1 = countSplits(new ForkJoinPool(1));
    int splitsForP2 = countSplits(new ForkJoinPool(2));
    assertEquals(splitsForP2, splitsForP1 * 2);
    int commonParallelism = ForkJoinPool.getCommonPoolParallelism();
    if (commonParallelism > 1 && commonParallelism < 128) {
        int splitsForPHalfC = countSplits(new ForkJoinPool(ForkJoinPool.getCommonPoolParallelism() / 2));
        int splitsForPC = countSplits(ForkJoinPool.commonPool());
        assertTrue(splitsForPHalfC < splitsForPC);
        assertEquals(splitsForPC / splitsForPHalfC, nearestPowerOfTwo(commonParallelism) / nearestPowerOfTwo(commonParallelism / 2));
    }
}

Example 43 with ForkJoinPool

use of java8.util.concurrent.ForkJoinPool in project streamsupport by stefan-zobel.

the class ForkJoinPool8Test method testAwaitQuiescence2.

/**
 * awaitQuiescence returns when pool isQuiescent() or the indicated
 * timeout elapsed
 */
public void testAwaitQuiescence2() throws Exception {
    /**
     * """It is possible to disable or limit the use of threads in the
     * common pool by setting the parallelism property to zero. However
     * doing so may cause unjoined tasks to never be executed."""
     */
    if ("0".equals(System.getProperty("java.util.concurrent.ForkJoinPool.common.parallelism")))
        return;
    final ForkJoinPool p = new ForkJoinPool();
    PoolCleaner cleaner = null;
    try {
        cleaner = cleaner(p);
        assertTrue(p.isQuiescent());
        final long startTime = System.nanoTime();
        @SuppressWarnings("serial") ForkJoinTask<?> a = new CheckedRecursiveAction() {

            protected void realCompute() {
                FibAction f = new FibAction(8);
                assertSame(f, f.fork());
                while (!f.isDone() && millisElapsedSince(startTime) < LONG_DELAY_MS) {
                    assertFalse(p.getAsyncMode());
                    assertFalse(p.isShutdown());
                    assertFalse(p.isTerminating());
                    assertFalse(p.isTerminated());
                    Thread.yield();
                }
                assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
                assertEquals(0, ForkJoinTask.getQueuedTaskCount());
                assertEquals(21, f.result);
            }
        };
        p.execute(a);
        assertTrue(p.awaitQuiescence(LONG_DELAY_MS, MILLISECONDS));
        assertTrue(p.isQuiescent());
        assertTrue(a.isDone());
        assertEquals(0, p.getQueuedTaskCount());
        assertFalse(p.getAsyncMode());
        assertEquals(0, p.getQueuedSubmissionCount());
        assertFalse(p.hasQueuedSubmissions());
        while (p.getActiveThreadCount() != 0 && millisElapsedSince(startTime) < LONG_DELAY_MS) Thread.yield();
        assertFalse(p.isShutdown());
        assertFalse(p.isTerminating());
        assertFalse(p.isTerminated());
        assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
    } finally {
        if (cleaner != null) {
            cleaner.close();
        }
    }
}

Example 44 with ForkJoinPool

use of java8.util.concurrent.ForkJoinPool in project streamsupport by stefan-zobel.

the class ForkJoinPool8Test method testAwaitQuiescence1.

/**
 * awaitQuiescence by a worker is equivalent in effect to
 * ForkJoinTask.helpQuiesce()
 */
public void testAwaitQuiescence1() throws Exception {
    final ForkJoinPool p = new ForkJoinPool();
    PoolCleaner cleaner = null;
    try {
        cleaner = cleaner(p);
        final long startTime = System.nanoTime();
        assertTrue(p.isQuiescent());
        @SuppressWarnings("serial") ForkJoinTask<?> a = new CheckedRecursiveAction() {

            protected void realCompute() {
                FibAction f = new FibAction(8);
                assertSame(f, f.fork());
                assertSame(p, ForkJoinTask.getPool());
                boolean quiescent = p.awaitQuiescence(LONG_DELAY_MS, MILLISECONDS);
                assertTrue(quiescent);
                assertFalse(p.isQuiescent());
                while (!f.isDone()) {
                    assertFalse(p.getAsyncMode());
                    assertFalse(p.isShutdown());
                    assertFalse(p.isTerminating());
                    assertFalse(p.isTerminated());
                    Thread.yield();
                }
                assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
                assertFalse(p.isQuiescent());
                assertEquals(0, ForkJoinTask.getQueuedTaskCount());
                assertEquals(21, f.result);
            }
        };
        p.execute(a);
        while (!a.isDone() || !p.isQuiescent()) {
            assertFalse(p.getAsyncMode());
            assertFalse(p.isShutdown());
            assertFalse(p.isTerminating());
            assertFalse(p.isTerminated());
            Thread.yield();
        }
        assertEquals(0, p.getQueuedTaskCount());
        assertFalse(p.getAsyncMode());
        assertEquals(0, p.getQueuedSubmissionCount());
        assertFalse(p.hasQueuedSubmissions());
        while (p.getActiveThreadCount() != 0 && millisElapsedSince(startTime) < LONG_DELAY_MS) Thread.yield();
        assertFalse(p.isShutdown());
        assertFalse(p.isTerminating());
        assertFalse(p.isTerminated());
        assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
    } finally {
        if (cleaner != null) {
            cleaner.close();
        }
    }
}

Example 45 with ForkJoinPool

use of java8.util.concurrent.ForkJoinPool in project streamsupport by stefan-zobel.

the class ForkJoinPoolTest method testInvokeAll5.

/**
 * invokeAll(c) returns results of all completed tasks in c
 */
public void testInvokeAll5() throws Throwable {
    ExecutorService e = new ForkJoinPool(1);
    PoolCleaner cleaner = null;
    try {
        cleaner = cleaner(e);
        List<Callable<String>> l = new ArrayList<>();
        l.add(new StringTask());
        l.add(new StringTask());
        List<Future<String>> futures = e.invokeAll(l);
        assertEquals(2, futures.size());
        for (Future<String> future : futures) assertSame(TEST_STRING, future.get());
    } finally {
        if (cleaner != null) {
            cleaner.close();
        }
    }
}