/**
* 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);
}
}
/**
* Successfully constructed pool reports default factory, parallelism and async mode policies, no
* active threads or tasks, and quiescent running state.
*/
public void testDefaultInitialState() {
ForkJoinPool p = new ForkJoinPool(1);
try (PoolCleaner cleaner = cleaner(p)) {
assertSame(ForkJoinPool.defaultForkJoinWorkerThreadFactory, p.getFactory());
assertFalse(p.getAsyncMode());
assertEquals(0, p.getActiveThreadCount());
assertEquals(0, p.getStealCount());
assertEquals(0, p.getQueuedTaskCount());
assertEquals(0, p.getQueuedSubmissionCount());
assertFalse(p.hasQueuedSubmissions());
assertFalse(p.isShutdown());
assertFalse(p.isTerminating());
assertFalse(p.isTerminated());
}
}
// 16、实现showLog()方法，接受一个ForkJoinPool对象作为参数，输出关于它的状态信息及线程、任务的执行信息
private static void showLog(ForkJoinPool pool) {
System.out.printf("**********************\n");
System.out.printf("Main: Fork/Join Pool log\n");
System.out.printf("Main: Fork/Join Pool: Parallelism: %d\n", pool.getParallelism());
System.out.printf("Main: Fork/Join Pool: Pool Size: %d\n", pool.getPoolSize());
System.out.printf(
"Main: Fork/Join Pool: Active Thread Count: %d\n", pool.getActiveThreadCount());
System.out.printf(
"Main: Fork/Join Pool: Running Thread Count: %d\n", pool.getRunningThreadCount());
System.out.printf(
"Main: Fork/Join Pool: Queued Submission: %d\n", pool.getQueuedSubmissionCount());
System.out.printf("Main: Fork/Join Pool: Queued Tasks: %d\n", pool.getQueuedTaskCount());
System.out.printf(
"Main: Fork/Join Pool: Queued Submissions: %s\n", pool.hasQueuedSubmissions());
System.out.printf("Main: Fork/Join Pool: Steal Count: %d\n", pool.getStealCount());
System.out.printf("Main: Fork/Join Pool: Terminated : %s\n", pool.isTerminated());
System.out.printf("**********************\n");
}