理解进程表示和状态转换、模式转换；掌握进程上下文切换机制；掌握软中断的实现机理和作用；掌握进程调度的基本思想；熟练应用进程相关的系统调用。重点在于进程的创建与结束、进程调度与切换以及软中断机制。-To understand the process of representation and state transitions, mode conversion master the process of context switching mechanism grasp the realiza