public void resetScore() {
/*
* score.set 与char2type.set这两个方法，虽然没有以原子的方式执行完成，但是
却不影响整个类的安全性，因为这两个方法没有相互依赖，只需保证单个方法以原子的方式执行即可，
这个情况与 java并发编程中的因式分解那个例子不同，
*/
score.set(0);
char2type.set(-1);
setScore();
}
static void oneRun(BlockingQueue<Runnable> q, int nThreads, int iters, boolean print)
throws Exception {
ThreadPoolExecutor pool =
new ThreadPoolExecutor(nThreads + 1, Integer.MAX_VALUE, 1L, TimeUnit.SECONDS, q);
CountDownLatch done = new CountDownLatch(iters);
remaining.set(nThreads - 1);
pool.prestartAllCoreThreads();
Task t = new Task(pool, done);
long start = System.nanoTime();
pool.execute(t);
done.await();
long time = System.nanoTime() - start;
if (print) System.out.println("\t: " + LoopHelpers.rightJustify(time / iters) + " ns per task");
q.clear();
Thread.sleep(100);
pool.shutdown();
Thread.sleep(100);
pool.shutdownNow();
}