实现了一个线程池。其中运用了队列，以避免任务丢失。在队列和线程池之间创建了一个中间夹层，以提高可移植性。当任务来时，先压入队列，然后唤醒线程执行操作。线程完成任务后，再去队列查询，如果有任务就去执行，没有则阻塞，等待-Implements a thread pool. The application the queue, to avoid task lost. In the queue and thread pool between to create a intermediate sandwich, in order to improve the portability. When the task comes, first presses in the queue, and then awaken thread perform operation. Thread after completion of a mission, to queue inquires the, if have the mission to carry out, no is blocked, wait