操作系统中进程的运行有三种基本状态:就绪态、运行态和阻塞态。请填下图中1、2、 3处的进程状态。
- A.运行、阻塞、就绪
- B.运行、就绪、阻塞
- C.阻塞、就绪、运行
- D.阻塞、运行、就绪
正确答案及解析
正确答案
解析
进程简单来说就是操作系统中正在运行的程序以及与之相关的资源的集合。操作系统中进程的运行有三种基本状态 : 就绪态、运行态和阻塞态。这三种基本状态在进程的生命周期中是不断变换的。从图29-1，由于调度程序的调度可以将就绪状态的进程转入运行状态；当运行的进程由于分配的时间片用完了，也可以转入就绪状态；阻塞状态的进程由于I/O操作完成，将该进程从阻塞队列中唤醒，使其进入就绪状态；还有一种情况就是运行状态的进程可能由于I/O请求的资源得不到满足而进入阻塞状态。
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