ABB机器人示教器 DSQC679 3HAC028357-001
报价单位：厦门航拓电气有限公司
联系人：戴先生
手机：18006003561（微信同号）
座机：0592-5072089
***：565167042
1 进程控制块：进程控制块的作用是使一个在多道程序环境下不能***运行的程序（包含数据），成为一个能***运行的基本单位，一个能与其它进程并发执行的进程。
2 程序段：是进程中能被进程调度程序在CPU上执行的程序代码段。
3 数据段：一个进程的数据段，可以是进程对应的程序加工处理的原始数据，也可以是程序执行后产生的中间或！终数据。
PCB中用于描述和控制进程运行的信息
1、进程标识符信息
进程标识符用于***的标识一个进程。一个进程通常有以下两种标识符。
外部标识符。由创建者提供，通常是由字母、数字组成，往往是用户（进程）访问该进程使用。外部标识符便于记忆，如：计算进程、打印进程、发送进程、接收进程等。
内部标识符：为了方便系统使用而设置的。在所有的OS中，都为每一个进程赋予一个***的整数，作为内部标识符。它通常就是一个进程的符号，为了描述进程的家族关系，还应该设置父进程标识符以及子进程标识符。还可以设置用户标识符，来指示该进程由哪个用户拥有。
2、处理机状态信息
处理机状态信息主要是由处理机各种寄存器中的内容所组成。
通用寄存器。又称为用户可视寄存器，可被用户程序访问，用于暂存信息。
指令寄存器。存放要访问的下一条指令的地址。
程序状态字PSW。其中含有状态信息。（条件码、 执行方式、中断屏蔽标志等）
用户栈指针。每个用户进程有一个或若干个与之相 关的系统栈，用于存放过程和系统调用参数及调用地址。栈指针指向该栈的栈顶。
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