多线程与内存的使用，现在是两个类，每个类都有各自的线程，两个独立的线程去共享内存池。本例子是一个空内存池队列，一个使用队列，使用完开辟内存释放还个内存池，而不是换个堆-Multithreading and memory usage, is now two classes, each class has its own thread, two independent thread to the Shared memory pool. This example is an empty queue m