[SPRING 2014] ASSIGNMENT
PROGRAM - BSc IT
SEMESTER - SECOND
SUBJECT CODE & NAME - BT0070, Operating Systems
CREDIT – 4 BK ID - B0954 MAX. MARKS - 60
You can pay in 6 instalment of Rs 125-125 if u have any doubt.
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Q. No.1 List the approaches to design operating system structures. Explain any two of them. 2+8=10
Answer:
Listing of approaches to design operating system structures:
Ø Layered approach
Ø The kernel based approach
Ø The virtual machine approach
2 Write short notes on:
1. Process Creation
2. Terminating Process 5+5= 10
Answer:
1. Process Creation
During the course of execution, a process may create several new proceses using a create-process system call. The creating process is called a parent process and the new processes are called the children of that
3 Is it possible to check the condition of mutual exclusion through hardware assistance? If yes, how? 10
Answer: Checking for mutual exclusion is also possible through hardware. Special instructions called Test and Set Lock (TSL) is used for the purpose. An important feature is that the set of instructions used for this purpose is indivisible, that is, they cannot be interrupted during execution. The instruction has the format TSL ACC, IND where ACC is an accumulator register and IND is a memory location used as a flag.
Q4
| 1. Given a total of 5 units of resource type 1 and 4 units of resource type 2, tell whether the following system is in a safe or unsafe state. Show your work. Type 1 Type 2 Process Used Max Used Max P1 1 2 1 3 P2 1 3 1 2 P3 2 4 1 4 2. |
5. What is the concept of virtual memory? Why virtual memory is needed? 3+7= 10
Answer: Virtual memory is a technique that allows execution of processes that may not be entirely in memory. In addition, virtual memory allows mapping of a large virtual address space onto a smaller physical memory. It also raises the degree of multi-programming and increases CPU utilization. Because of the above features, users are freed from worrying about memory requirements and availability.
6 What do you mean by Global OS? State the concept of migration and resource allocation in Global OS.
4+6= 10
Answer: Global Operating System (GOS)
The NOS is responsible for activities such as memory and process management on the server. The NOS converts a request into a task, schedules and executes it. Memory and processing power in all other computers in the network is not tapped to the maximum by a NOS. This is exactly what the GOS attempts to do. It has a list of processes executing on different machines and the resources needed by each one of
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