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Q. How does the distinction among kernel mode and user mode function as a rudimentary form of protection (security) system?
Answer: The distinction among kernel mode and user mode provides a rudimentary form of protection in the following manner. Certain instructions could be executed merely when the CPU is in kernel mode. Likewise hardware devices could be accessed only when the program is executing in kernel mode. Control over when disrupt could be enabled or disabled is also possible only when the CPU is in kernel mode. Therefore the CPU has very limited capability when executing in user mode thereby enforcing protection of critical resources.
Compare user threads and kernel threads. User threads:- User threads are supported above the kernel and are executed by a thread library at the user level. Thread creation
Q. Which of the subsequent instructions should be privileged? a) Read the clock b) Clear memory c) Set value of timer d) Issue a trap instruction e) Turn off interr
The scheduling technique in which CPU is allocated to the process with least CPU-burst time is known as Shortest job first Scheduling is a scheduling technique in which CPU i
Explain the Types of System Calls The major types of system calls are like this: a. Process Control: These types of system calls are employed to control the processes.
Consider a particular system that does not have an interrupting clock. The only way a thread can lose the processor is to voluntarily surrender it. Additionally, the operating sy
We can view an operating system as a resource allocator. Explain. We can outlook an operating system as a resource allocator. A computer system has Many resources (software and
What are kernels and what do kernels do? The kernel is a program that comprises the central core of a computer operating system. It has entire control over everything that
What is a general graph? A tree structure where links can go from one branch to a node earlier in the similar branch or other branch, allowing cycles.
What are the different types of semaphore? Principally the semaphore is able to be classified into two on the basis of their values a) Counting semaphore: In counting s
shell program for Armstrong number
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