/** getPoolSize returns number of started workers. */
public void testGetPoolSize() {
final CountDownLatch taskStarted = new CountDownLatch(1);
final CountDownLatch done = new CountDownLatch(1);
final ForkJoinPool p = new ForkJoinPool(1);
try (PoolCleaner cleaner = cleaner(p)) {
assertEquals(0, p.getActiveThreadCount());
final Runnable task =
new CheckedRunnable() {
public void realRun() throws InterruptedException {
taskStarted.countDown();
assertEquals(1, p.getPoolSize());
assertEquals(1, p.getActiveThreadCount());
done.await();
}
};
Future<?> future = p.submit(task);
await(taskStarted);
assertEquals(1, p.getPoolSize());
assertEquals(1, p.getActiveThreadCount());
done.countDown();
}
assertEquals(0, p.getPoolSize());
assertEquals(0, p.getActiveThreadCount());
}
static void test(ForkJoinPool pool, int num) throws Exception {
int ps = pool.getParallelism();
long start = System.nanoTime();
DynamicFib f = new DynamicFib(num);
pool.invoke(f);
long time = System.nanoTime() - start;
double secs = ((double) time) / NPS;
long result = f.number;
System.out.print("DynamicFib " + num + " = " + result);
System.out.printf("\tTime: %9.3f", secs);
long sc = pool.getStealCount();
long ns = sc - lastStealCount;
lastStealCount = sc;
System.out.printf(" Steals: %4d", ns / ps);
System.out.printf(" Workers: %4d", pool.getPoolSize());
System.out.println();
}
// 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");
}
