ABB机器人配件 DSQC352A 3HNE00009-1/11
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
PCB(Process Control Block的缩写)意思为进程控制块。
进程的静态描述
由三部分组成
PCB、有关程序段和该程序段对其进行操作的数据结构集。
在Unix或类Unix系统中,进程是由进程控制块,进程执行的程序,进程执行时所用数据,进程运行使用的工作区组成。其中进程控制块是!重要的一部分。
进程控制块是用来描述进程的当前状态,本身特性的数据结构,是进程中组成的!关键部分,其中含有描述进程信息和控制信息,是进程的集中特性反映,是操作系统对进程具体进行识别和控制的依据。
PCB一般包括:
1.程序ID(PID、进程句柄):它是***的,一个进程都!须对应一个PID。PID一般是整型数字
2.特***息:一般分系统进程、用户进程、或者内核进程等
3.进程状态:运行、就绪、阻塞,表示进程现的运行情况
4.优先级:表示获得CPU控制权的优先级大小
5.通信信息:进程之间的通信关系的反映,由于操作系统会提供通信信道
6.现场保护区:保护阻塞的进程用
7.资源需求、分配控制信息
8.进程实体信息,指明程序路径和名称,进程数据在物理内存还是在交换分区(分页)中
9.其他信息:工作单位,工作区,文件信息等
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