说明：  这是一个内存分配管理程序。在一些实时通讯系统中，需要经常分配和释放内存，会造成较多的内存碎片。这个程序可以在一开始分配一大片内存，从而避免频繁申请和释放内存。大大提高程序的执行效率。
(This is a memory allocation management procedures. In some real-time communication systems, the need for frequent distribution and release memory, the memory caused more debris. This procedure can be started in an allocation of a large memory, thus avoiding the frequent application and release memory. The process greatly enhanced the efficiency of enforcement.)