Process Control

Question 1

Specific processes require certain privileges in order to protect the hardware and the OS from impending malfunction.

Answer 1

Modes of execution

Question 2

This is referred as the less-privileged mode, since user programs execute in this mode

Answer 2

User mode

Question 3

This is referred to as the more-privileged mode, where the software has complete control of the processor and its instructions, registers, and memory

Answer 3

Kernel mode

Question 4

Process creation can proceed as follows:

Answer 4

1. Assign a unique process identifier to the new process
2. Allocate space for the process
3. Initialize the process control block
4. Set the appropriate linkages
5. Create or expand other data structures

Question 5

When the operating system controls the currently running processes, a process switch may occur at any time. Thus, the OS needs to provide a regaining control feature if a process is blocked, suspended, or paused.

Answer 5

Process switching

Question 6

Any computer system must provide means for a process to indicate its completion

Answer 6

Process termination

Question 7

A batch job may include a … or an …

Answer 7

halt instruction or OS service call for termination