OS (BCA 4th)

SECTION A

Introduction: Application programs and system programs; functions of an operating system;

classification of operating systems-Multi-user, multiprogramming, multiprocessing, time

sharing, multi-threaded. Subsystems – Top Layer, Middle Layer, Bottom Layer, Bootstrap,

Protection and security.

Processes and Threads: Program vs. Process; Process context, address space, identification,

transition, state & management. Thread management-benefits, synchronization issues;

applications of threads.

SECTION B

CPU Management: Objectives, Pre-emptive vs. Non-pre-emptive, context switching,

scheduling schemes; multi-processor scheduling, thread scheduling.

Inter-process Communications: Introduction, message passing model, shared memory model.

Pipe, FIFO and Socket.

SECTION C

Memory Management: Introduction, address binding, relocation, loading, linking, memory

sharing and protection; Paging and segmentation; Virtual memory: basic concepts of demand

paging, performance, page replacement. Thrashing.

I/O Device Management: I/O devices and controllers, device drivers; disk storage, scheduling

and management.

SECTION D

File Management: Basic concepts, file operations, access methods, directory structures and

management, remote file systems; file protection.

Protection & Security: Need, environments: software, hardware, unauthorized use, denial of

services, access control and authentication. Application security, attacks, virus & anti-virus,

firewall.