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 about critical regions and monitors. The processes are assumed to have arrived in the order p1, p2, p3, p4, p5, all ooperating time 0.

What is a resource-allocation graph? Briefly explain the types of system calls provided by a typical operating system. Digital Logic Circuits – Circuit systemm Boolean exp Consider the following set of process, with the length of the CPU-burst time given in milliseconds: What is a Dispatcher?


Define entry section and exit section. What are batch systems? What are the methods for handling deadlocks? 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?


What are the common strategies to select a free hole from systemm set of available holes? What is the main function of the memory-management unit? What are the advantages of Linked allocation?

List the various file attributes. What is a reference string?

Anna University 4th Semester CSE Notes

What are the operations that can be performed on a directory? What are the disadvantages of linked allocation? Differentiate tightly coupled systems and loosely coupled systems.

Write about the various CPU scheduling algorithms.

What are the most common schemes for defining the opperating structure of a directory? What are conditions under which a deadlock situation may arise? Anna University—Chemistry 1—January Question Explain in detail about swapping and thrashing.


How free-space is managed using bit vector implementation? Department of Computer Science and Engineering. What are the requirements that a solution to the critical section problem must satisfy? What is mean by streams? What is a pure demand paging?

Operating Systems CS notes – Annauniversity lastest info

What are the various scheduling criteria for CPU scheduling? Where is the Menu? Anna University—Engineering Chemistry 1—Important Define request edge and assignment edge.

What are the different accessing methods of a file?

What is co-operative process? What are the functions of virtual file system VFS?

Remember that frames are initially empty. What are the benefits OS co-operating processes? What is sector sparing? What is dispatch latency?