对进程进行操作.进程是由进程控制块、程序段、数据段三部分组成。一个进程可以包含若干线程(Thread)，线程可以帮助应用程序同时做几件事(比如一个线程向磁盘写入文件，另一个则接收用户的按键操作并及时做出反应，互相不干扰)，在程序被运行后中，系统首先要做的就是为该程序进程建立一个默认线程，然后程序可以根据需要自行添加或删除相关的线程。-To operate the process. The process by the process control blocks, program segment, data segment consists of three parts. A process can contain a number of threads (Thread), a thread can help an application to do several things at the same time (for example, one thread writes to the disk file, the other to receive the user' s button operation and timely response, mutual non-interference), in programs are running, the system first thing to do is to establish a default for the program process thread, and then the program can be added or removed as needed related to their own thread.