Key Definitions

Question 1

Source File

Answer 1

Contains a programs instructions. Some instructions are essential for the basic up running of an operating system, others can be created, modified and maintained to fit specific needs

Question 2

Executable File

Answer 2

A compiled version of a source files, used to perform various functions

Question 3

A Process

Answer 3

An instance of a computer program being executed by one or many threads

Question 4

Pre-emptive

Answer 4

When a process has been allocated time in the CPU, it can be interrupted whether or not the process has been complete. It is used when a process switches from running / waiting state to ready state

Question 5

Non-Pre-Emptive

Answer 5

When a process has been allocated time in the CPU and will not be interrupted until it completes. It is used when a process terminated or switches from waiting to ready state

Question 6

Round Robin

Answer 6

Each process is assigned a fixed time slot in a cyclic way

Question 7

Logical Adress

Answer 7

• generated by CPU whilst program is running
• virtual as it doesn’t physically exist
• used as reference to access physical memory location

Question 8

Physical Addrsss

Answer 8

• finds a physical location in memory
• memory management unit computes the physical address for the corresponding logical address
• the user never deals with the physical address, it can old be accessed by the logical address