/**
* After invoking a single task, isQuiescent eventually becomes true, at which time queues are
* empty, threads are not active, the task has completed successfully, and construction parameters
* continue to hold
*/
public void testIsQuiescent() throws Exception {
ForkJoinPool p = new ForkJoinPool(2);
try (PoolCleaner cleaner = cleaner(p)) {
assertTrue(p.isQuiescent());
long startTime = System.nanoTime();
FibTask f = new FibTask(20);
p.invoke(f);
assertSame(ForkJoinPool.defaultForkJoinWorkerThreadFactory, p.getFactory());
while (!p.isQuiescent()) {
if (millisElapsedSince(startTime) > LONG_DELAY_MS)
throw new AssertionFailedError("timed out");
assertFalse(p.getAsyncMode());
assertFalse(p.isShutdown());
assertFalse(p.isTerminating());
assertFalse(p.isTerminated());
Thread.yield();
}
assertTrue(p.isQuiescent());
assertFalse(p.getAsyncMode());
assertEquals(0, p.getQueuedTaskCount());
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(f.isDone());
assertEquals(6765, (int) f.get());
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
}
}
protected Integer compute() {
int n = number;
if (n <= 1) return n;
FibTask f1 = new FibTask(n - 1);
f1.fork();
return (new FibTask(n - 2)).compute() + f1.join();
}