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Comparison between real time and time sharing operating system

Protection and security

• Protection refers to a mechanism for controlling the access of program s processes, or users to the resources defined by computer system.

• The concept of protection came with the advent of multiprogramming where several processes compete for the use of CPU.

• the purpose was to confine each users program to its assigned areaof memory so that the programs cannot interface and harm each other.

• Protection in main memory is particularly important because of address translation. The purpose of protection is to allow concurrently running process to share the common physical address space.

• Protection also ensure that only process that have gained proper authorization from the operating system can operate on memory segment , the CPU, files and other resources.

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Multi user Operating System

Multi user operating system · In a multi-user operating system, multiple number of user can access different resources of a computer at a same time. · The access is provided using a network that consists of various personal computer attached to a mainframe computer system. diagram of multi -user operating system · The various personal computer can send and receive information to mainframe computer system. · The example of multi-user OS are UNIX, windows 2000,novell netware. sing...

Multilevel Feedback queue scheduling (MFQ)

Multilevel Feedback queue scheduling (MFQ) · Multilevel feedback queue scheduling is an enhancement of multi-levelqueue scheduling. In this scheme, processes can move between the different queue · The various processes are separates in different queue on the basis of their CPU Burst Char characteristics · If a process consumes a lot of CPU time , it is placed into a lower priority queue. Thus I/O bound and interactive process are placed in the higher priority queue and CPU bound pricesses are in lower priority · If a processes waits too long in a lower priority queue it is moved higher priority queue. Such an aging prevents starvation. · The top priority queue is given smallest CPU time Quantum · ...

Multi processing system

Multi processing system · Multi processesor system is the sytem that contain two or more processors or CPUS and has ability to simultaneously execute several programs. Hence the name multi-processor In such a system, multiple processor share the clock, bus, memory and peripheral devices. · A multi processor system is also known as parallel system · Multi processor system are categorized into two different types: single user operating system 2. Multi user operating system 3. Batch processing operating system 4. Multi programming operating system 5. Multi tasking operating sy...

Monolithic Architecture

Monolithic Architecture Monolith means composed all in one piece. The Monolithic application describes a single-tiered software application in which different components combined into a single program from a single platform. Components can be: Authorization — responsible for authorizing a user Presentation — responsible for handling HTTP requests and responding with either HTML or JSON/XML (for web services APIs). Business logic — the application’s business logic. Database layer — data access objects responsible for accessing the database. Application integration — integration with other services (e.g. via messaging or REST API). Or integration with any other Data sources. Notification module — responsible for sending email notifications whenever needed. Example for Monolithic Approach Consider an example of Ecommerce application, that authorizes customer, takes an order, check products inventory, authorize payment and ships ordered products. This applicat...

Write a note on real time OS.

Write a note on real time OS. Ans. In real time operating system , job is to be completed within the rigid time constraints otherwise job loses its meaning. A real time system functions correctly only if it return the correct result within its time constraints Thus, in a real tome system , the correctness of the computation not only depends upon the logical correctness of the but also upon the time at which the result is produced. A real time system is often used as a central device in a dedicated applications like fuel-injection system, robotics, air- traffic control, medical imaging systems, systems that control scientific experiment, industrial control system and weapon systems .