假设某计算机系统中进程的三态模型如下图所示,那么图中的a、b、c、d处应分别填写( )。
- A.作业调度、时间片到、等待某事件、等待某事件发生了
- B.进程调度、时间片到、等待某事件、等待某事件发生了
- C.作业调度、等待某事件、等待某事件发生了、时间片到
- D.进程调度、等待某事件、等待某事件发生了、时间片到
正确答案及解析
正确答案
解析
本题考查操作系统进程管理方面的基础知识。进程具有三种基本状态:运行、就绪和阻塞。处于这三种状态的进程在一定条件下,其状态可以转换。作业调度是外存与内存之间的调度,使进程从创建态到就绪态的过程,而进程调度是从内存到CPU的调度,使进程从就绪态到运行态的过程。当CPU空闲时,进程调度将选择处于就绪态的一个进程进入运行态;而当CPU的一个时间片用完时,当前处于运行态的进程就进入了就绪态;进程从运行到阻塞状态通常是由于进程释放CPU,等待系统分配资源或等待某些事件的发生。例如,执行了P操作,系统暂时不能满足其对某资源的请求,或等待用户的输入信息等;当进程等待的事件发生时,进程从阻塞到就绪状态,如I/O完成。B选项正确。
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