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Implementing Protection with Virtual Memory - computer architecture:
To enable the operating system to implement protection in the VM system, the HW have to:
I. Support at least 2 modes that denoted whether the running process is a user process (executive process) or an operating system process (kernel/supervisor process).
II. Provide a part ion of the CPU state that a user process may read but not write (includes supervisor mode bit).
o Only operating system process may change page tables. Page tables are held in operating system address space thereby preventing a user procedure from changing them.
o When processes desire to share information in a restricted way, the OS have to assist them.
o The write access bit (in both the TLB and the page table) can be used to limit the sharing to only read sharing.
Which of the memory is volatile memory ? Ans. A volatile memory is RAM. Term Volatile memory implies the contents of the RAM get erased as soon as the power goes off.
What are escape sequences characters? List any six of them. The characters which when used with output functions like printf( ),putc(),put() etc. helps in formatting the outpu
Telephone companies normally provide a voltage of to power telephones? Telephone companies usually give a voltage of to power telephones -48 volts DC.
Optimality - Heuristic search strategies: The path cost of a solution is considered as the sum of the costs of the actions that led to which solution is given. This is only on
What are links and associations? Link is a physical or conceptual connection between objects. A link is an instance of an association. Association is a explanation of group
Shared Memory Shared Memory refers to memory component of a computer system in which the memory can accessed directly by any of the processors in the system. Distributed
What is computer science
Explain the term Progressive Control. Progressive Control: Step by step system is an illustration of progressive control. The connection is established in stages, in respo
what is cascading rolback?
With LDB one can change the pre-generated selection screen to their needs Yes with LDB one can alter the pre-generated selection screen.
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