Introduction

Question 1

OS Software that talks with controller and gives commands

Answer 1

Device driver

Question 2

Three types of communication used

Answer 2

Device Driver

Question 3

Manufacturer supplies one for each controller

Answer 3

Device driver

Question 4

Driver issues command to controller and polls device till ready.

Answer 4

I/O Polling

Question 5

Generate hardware interrupt when I/O finished

Answer 5

I/O by Interrupts

Question 6

Special controller which avoids using CPU for transferring to/from memory

Answer 6

I/O by DMA

Question 7

Program in execution with unique address space

Answer 7

Process

Question 8

Text, data, and stack

Answer 8

Process

Question 9

Organized as tree structure, path proceeds from root

Answer 9

File directory

Question 10

I/O devices that OS treats as file

Answer 10

Special files

Question 11

Pseudofile to connect two processes reading/writing

Answer 11

Pipe

Question 12

Small number of processes, mechanism in kernel and policy outside kernel

Answer 12

Microkernel

Question 13

Schedules processes by priority scheduling algorithm

Answer 13

Mechanism

Question 14

Assign process priorities in user space

Answer 14

Policy