[考研类试卷]进程管理模拟试卷1.doc

[考研类试卷]进程管理模拟试卷1

一、单项选择题

下列各题的备选答案中，只有一个是符合题意的。

1 操作系统是扩充( )功能的第一层系统软件。

（A）软件

（B）裸机

（C）机器语言

（D）中断

2 不影响分时系统响应时间的是( )。

（A）进程调度和对换的时间

（B）分时用户的数目

（C）分时用户所运行程序的特性

（D）时间片的大小

3 当用户程序需要使用操作系统功能从磁盘读取执行的程序和数据时，首先要通过专门的指令完成( )。

（A）从运行态到阻塞态的转换

（B）进程从活动态到挂起态的转换

（C）进程从用户态到系统态的转换

（D）进程从系统态到用户态的转换

4 在批处理系统中，不属于作业管理程序任务的是( )。

（A）按照调度算法在后备状态的作业中选择作业

（B）为选中的作业创建相应进程

（C）为选中的作业分配主存等系统资源

（D）为作业对应的进程分配处理器

5 多个进程同时存在于一个系统内，能在同一时间段内运行，被称为进程的( )。

（A）动态性

（B）异步性

（C）封闭性

（D）并发性

6 为进程一次性分配其所需的资源是一种( )方法，它能使系统不发生死锁。

（A）死锁预防

（B）死锁检测

（C）死锁避免

（D）死锁解除

7 死锁预防是保证系统不进入死锁状态的静态策略，其解决办法是破坏产生死锁的四个必要条件之一。下列方法中破坏了“循环等待”条件的是（）。

（A）银行家算法

（B）一次性分配策略

（C）剥夺资源法

（D）资源有序分配策略

8 某系统中有三个并发进程都需要四个同类资源，该系统不会发生死锁的最少资源是（）。

（A）9

（B）10

（C）11

（D）12

9 某系统中共有ll台磁带机，x个进程共享此磁带机设备，每个进程最多请求使用3台，则系统不会死锁的x值是（）。

（A）4

（B）5

（C）6

（D）7

10 某计算机系统中有8台打印机，由K个进程竞争使用，每个进程最多需要3台打印机。该系统可能会发生死锁的K的最小值是（）。

（A）2

（B）3

（C）4

（D）5

11 解除死锁通常不采用的方法是（）。

（A）终止一个死锁进程

（B）终止所有死锁进程

（C）从死锁进程处抢夺资源

（D）从非死锁进程处抢夺资源

12 采用资源剥夺法可以解除死锁，还可以采用（）方法解除死锁。（A）执行并行操作

（B）撤销进程

（C）拒绝分配新资源

（D）修改信号量

13 在下列死锁的解决方法中，属于死锁预防策略的是（）。

（A）银行家算法

（B）资源有序分配算法

（C）死锁检测算法

（D）资源分配图化简法

14 引入多道程序技术的前提条件之一是系统具有（）。

（A）多个CPU

（B）多个终端

（C）中断功能

（D）分时功能

15 在单处理器系统中实现并发技术后（）。

（A）各进程在某一时刻并行运行，CPU与外设间并行工作

（B）各进程在一个时间段内并行运行，CPU与外设间并行工作

（C）各进程在一个时间段内并行运行，Cvu与外设间串行工作

（D）各进程在某一时刻并行运行，CPU与外设间串行工作

16 三个进程共享四个同类资源，这些资源的分配与释放只能一次一个。已知每一个进程最多需要两个该类资源，则该系统（）。

（A）有些进程可能永远得不到该类资源

（B）必然有死锁

（C）进程请求该类资源立刻能得到

（D）必然是死锁

17 以下有关资源分配图的描述中正确的是（）。

（A）有向边包括进程指向资源类的分配边和资源类指向进程申请边两类

（B）矩形框表示进程，其中圆点表示申请同一类资源的各个进程

（C）圆圈节点表示资源类

（D）资源分配图是一个有向图，用于表示某时刻系统资源与进程之间的状态

18 死锁的四个必要条件中，无法破坏的是（）。

（A）环路等待资源

（B）互斥使用资源

（C）占有且等待资源

（D）非抢夺式分配

19 死锁与安全状态的关系是（）。

（A）死锁状态有可能是安全状态

（B）安全状态有可能成为死锁状态

（C）不安全状态就是死锁状态

（D）死锁状态一定是不安全状态

20 某一系统中，测得其处理器的利用率为1％，I／O的利用率为1％，就绪队列中有进程2个，阻塞队列中有进程31个，此时系统出现异常，则表明系统中有进程（）。

（A）空闲

（B）饥饿

（C）死锁

（D）抖动

21 死锁检测时检查的是（）。

（A）资源有向图

（B）前驱图

（C）搜索树

（D）安全图

22 某个系统采用下列资源分配策略。如果一个进程提出资源请求得不到满足，而此时没有由于等待资源而被阻塞的进程，则自己就被阻塞。而当此时已有等待资源而被阻塞的进程，则检查所有由于等待资源而被阻塞的进程。如果它们有申请进程所需要的资源，则将这些资源取出分配给申请进程。这种分配策略会导致

（）。

（A）死锁

（B）颠簸

（C）回退

（D）饥饿

23 在( )的情况下不可能产生死锁的。

（A）多道程序环境中系统资源有限

（B）使用同类临界资源的并发进程随机交替运行

（C）规定进程一旦得到了需要的所有资源才投入运行

（D）就绪队列中已无等待的进程

24 处理器设计成两种执行状态：系统态和用户态，是为了( )。

（A）加快系统的运行速度

（B）实现系统程序的共享

（C）实现用户程序的保密

（D）防止用户程序对操作系统的破坏

25 文件系统中，( )利用二进制的一位来表示磁盘中一块的使用情况。（A）空白文件目录

（B）位示图

（C）空闲块链

（D）空闲块成组链

26 一个进程是（）。

（A）由协处理器执行的一个程序

（B）一个独立的程序+数据集

（C）PCB结构与程序和数据的组合

（D）一个独立的程序

27 下列关于线程的叙述中，正确的是（）。

（A）线程包含CPU现场，可以独立执行程序

（B）每个线程有自己独立的地址空间

（C）进程只能包含一个线程

（D）线程之间的通信必须使用系统调用函数

28 进程之间交换数据不能通过（）途径进行。

（A）共享文件

（B）消息传递

（C）访问进程地址空间

（D）访问共享存储区

29 进程与程序的根本区别是（）。

（A）静态和动态特点

（B）是不是被调入到内存中

（C）是不是具有就绪、运行和等待三种状态

（D）是不是占有处理器

30 下面的叙述中，正确的是（）。

（A）进程获得处理器运行是通过调度得到的

（B）优先级是进程调度的重要依据，一旦确定不能改动

（C）在单处理器系统中，任何时刻都只有一个进程处于运行状态

（D）进程申请处理器而得不到满足时，其状态变为阻塞状态

31 若某一进程拥有100个线程，这些线程都属于用户级线程，则在系统调度执行时间上占用的时间片是（）。

（A）1

（B）100

（C）1／100

（D）0

32 进程P1、P2和P3单独执行时间分别为l0min、15min和20min，其中处理器占用时间分别为2min、3min和12min。如果采用多道程序设计技术使其并发，并假设处理器的利用率可以达到60％，加上系统开销5min，那么并发使得计算机系统的效率提高了（）。

（A）63％

（B）38％

（C）74％

（D）26％

二、综合题

33 什么是PCB，它的三个主要组成部分是什么?

34 进程与线程最根本的差别是什么?

35 在分区式存储管理中，什么是“地址重新定位”?动态和静态重新定位的区别是什么?

36 哪一种RAID保存两份数据?RAID4与RAID5的区别是什么?

37 什么是FCB，它的三个主要组成部分是什么?

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