(d) Assure that when there are several active processes in the computer, each will get fair and non-interfering access to the central processing unit for execution

(d) Assure that when there are several active processes in the computer, each will get fair and non-interfering access to the central processing unit for execution;

(e) Take care of storage and device allocation;

Goals of an OS

• The primary goal of an operating system is to make the computer convenient to use.
• The secondary goal is to use the hardware in an efficient manner.

Generations of Operating Systems

• Operating systems have been evolving over the years.
• Research/Assignment
• Discuss the evolution of operating systems

Types of Operating Systems

• Modern computer operating systems may be classified into 8 groups
• Batch Processing operating system
• users submit jobs to a central place where these jobs are collected into a batch, and subsequently placed on an input queue at the computer where they will be run.
• Time sharing
• a computer provides computing services to several or many users concurrently in-line.
• Real Time Operating System
• are designed to service those applications where response time is of essence in order to prevent error, misrepresentation or even disaster.
• E.g of RTOS are those which handle airlines reservations, machine tool control, and monitoring of a nuclear power station

• Distributed Operating System
• consists of a number of computers that are connected and managed so that they automatically share the job processing load among the constituent computers
• Network Operating System
• Runs on a server and provides the server the capability to manage data, users, applications other networking functions.
• Multiprocessing System
• Multiprogramming Operating System
• Embedded Operating Systems