Dear students here we provide notes for Anna university 4TH sem Subject CS OPERATING SYSTEM notes pdf. you can download the OS notes as per the. Class lecture notes for second Year,fourth semester Operating Systems (Subject Code: CS) is available here in PDF formats for you to. Why is the Operating System viewed as a resource allocator & control program? 3. What is ii) Write short notes on co-operating process and schedulers. (8).

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Write short notes about Process concept and process scheduling. List the various file attributes. What are the most common schemes for defining the logical structure of a directory? What are the benefits of multithreaded programming? What is Look Scheduling? Explain about contiguous memory noets. Consider the following snapshot of a system: What is a process? What is an operating system?

What are the use of job queues, ready opwrating and device queues? What is the use of inter process communication? What are the functions of virtual file system VFS? Anna University Department of Civil Engineering B. Basic Gates and Verilog D Explain the various types of computer systems. The status of the queue is as follows 86, opsrating, What is the total distance in cylinders that the disk arm moves to satisfy the entire pending request for each of the following disk-scheduling algorithms?


How many page faults would occur for the following replacement algorithms, assuming frame size is. Anna University – B. What is the basic approach of page replacement?

Write in detail about directory structure. Explain the various disk scheduling techniques 3. What is logical address space and physical address space?


What are the common strategies to select a free hole from a set of available holes? What is the use of fork and exec system calls? What are conditions under which a deadlock situation may arise? What are the advantages of Contiguous allocation? What are the drawbacks of contiguous allocation of disk space? Mathematics 1 – January oeprating May Question Explain the basic concepts of segmentation.

Anna University systen Engineering Chemistry 1 – Januar Write in detail about file concept.

Difference between stable storage and tertiary storage. What is preemptive and no preemptive scheduling? What are the advantages of Indexed allocation? What are the advantages of Linked allocation? Digital Logic Circuits—Multiplexer and De-multiple What are the various page replacement algorithms used for page replacement? What is real time system?


What is turnaround time? State the advantage of multiprocessor system. A hard disk having cylinders, numbered from 0 to Define busy waiting and spin lock. operqting

The processes are assumed to have arrived in the order p1, p2, p3, p4, p5, all at time 0. Define logical address and physical address. What are the major problems to implement demand paging? What are the benefits OS co-operating processes?

Operating Systems CS notes – Annauniversity lastest info

Define rotational latency and disk bandwidth. What is a resource-allocation graph? What is meant by syste switch? What are files and explain the access methods for files? What are the requirements that a solution to the critical section problem must satisfy? Explain the various page replacement strategies. Department of Computer Science and Engineering.

Define effective access time.

Anna University—Engineering Chemistry 1—Important

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