Operating Systems Section 1 - Technical Questions and Answers

Operating Systems - Section 1

11.	When is a system in safe state?
	Answer: The set of dispatchable processes is in a safe state if there exists at least one temporal order in which all processes can be run to completion without resulting in a deadlock. Workspace Report errors ... Name : Email: View Answer

12.

What is cycle stealing?

13.

What is meant by arm-stickiness?

14.	What are the stipulations of C2 level security?
	Answer: C2 level security provides for: Discretionary Access Control Identification and Authentication Auditing Resource reuse Workspace Report errors ... Name : Email: View Answer

15.	What is busy waiting?
	Answer: The repeated execution of a loop of code while waiting for an event to occur is called busy-waiting. The CPU is not engaged in any real productive activity during this period, and the process does not progress toward completion. Workspace Report errors ... Name : Email: View Answer

16.

Explain the popular multiprocessor thread-scheduling strategies.

17.	When does the condition 'rendezvous' arise?
	Answer: In message passing, it is the condition in which, both, the sender and receiver are blocked until the message is delivered. Workspace Report errors ... Name : Email: View Answer

18.	What is a trap and trapdoor?
	Answer: Trapdoor is a secret undocumented entry point into a program used to grant access without normal methods of access authentication. A trap is a software interrupt, usually the result of an error condition. Workspace Report errors ... Name : Email: View Answer

19.	What are local and global page replacements?
	Answer: Local replacement means that an incoming page is brought in only to the relevant process address space. Global replacement policy allows any page frame from any process to be replaced. The latter is applicable to variable partitions model only. Workspace Report errors ... Name : Email: View Answer

20.	Define latency, transfer and seek time with respect to disk I/O.
	Answer: Seek time is the time required to move the disk arm to the required track. Rotational delay or latency is the time it takes for the beginning of the required sector to reach the head. Sum of seek time (if any) and latency is the access time. Time taken to actually transfer a span of data is transfer time. Workspace Report errors ... Name : Email: View Answer