Chapter 6

Question 1

Which scheduler invoke processes faster. Short-term scheduler Or long-term scheduler

Answer 1

Short-term scheduler

Question 2

The task of medium scheduler called what

Answer 2

Swap out

Question 3

What is context switch

Answer 3

CPU switch to another process, the system must save the state of the current process and load the saved state of new process

Question 4

What is PC

Answer 4

Program counter

Question 5

In the execution of parent child processes, who terminates first

Answer 5

Child process

Question 6

Does parent child processes share resources

Answer 6

There can be 3 cases:

1. Parent child share all resources
2. Child share a subset of parent resources
3. Parent and child share no resources

Question 7

Does unix clone a parent process to make its child

Answer 7

Yes

Question 8

What are 4 system calls in unix

Answer 8

1. Fork (for process creation, which consists of a copy of the address space of parent)
2. Exit (for process termination)
3. Wait
4. Exec (process overwrite itself with another executable)

Question 9

What is daemon in unix

Answer 9

All system processes run in background to provide services to users called daemon.

Question 10

What are the differences between child and parent processes

Answer 10

• Parent ID different
• Child ID different
• Child has its own copy of parent’s file descriptor