ACHIEVEMENTS OF OPERATING SYSTEMS
Operating systems are the most important development in the history of computers. with this there were many challenges which came along. As time passed more efficient alternatives started evolving n thereby decreasing the number of challenges
Majorly we have 4 theoretical advances in the development of operating systems:
- Processes -
- Process is a simple program which needs to be executed whenever a command is entered. it may include data stored in variables and buffers.
- The CPU is responsible for executing these processes. OS also looks in if there is any other task awaited for execution during current process etc.
- the components of os are data space, registers, stack, pc, and execution code.
- Memory management -
- Memory management deals with the function of storing data required for the execution of the proceses. most of the data is stored in the virtual memory. a reference is created to access this.
- OS has five principal storage management responsibilities: process isolation, automatic allocation and management, support of modular program, protection and access control, and long term storage.
- Virtual memory is a facility that allows programs to address memory from a logical point of view.
- Information protection and security -
- Withe the help of OS, some general purpose tools have been created which ensure security of the computer data.
- the overall workof information protection and security is divided into 4 groups namely : availabilty, confidentiality (prevents data to be read from unauthorized source), authenity (proper verfication of data and identity of users) and data integrerity (protection from unauthorized modifications).
- Scheduling and resource management -
- The most important task of os is to mange resources and schedule their usage.
- IT should aim to give fair n equal access to all resources.
- OS should maximise output, minimize the time required for response and accomodate as many as users as possible.
