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Briefly discuss on I/O hardware?
A controller is a collection of electronics that can operate a port, a bus, or a device. A serial-port controller is an easy controller. It is a single chip in the computer that controls the signals the signal on the wires of a serial port. The device control registers are mapped into the address space of the processor. The CPU implements I/O requests using the standard data transfer instructions to read and write the device-control registers. An I/O port having of
a. Status register
b. Control register
c. Data-in register
d. Data-out register
How is a process chosen for being swapped either in or out? Swap out: a. If the process is idle. b. If process has been in main memory for a long time.
Q. Polling for an I/O completion is able to waste a large number of CPU cycles if the processor iterates a busy-waiting loop several times before the I/O completes. However if the
Which is most common phase structured grammar? Most common phase structured grammar is Context – Sensitive
Q. Several CPU-scheduling algorithms are parameterized for instance the RR algorithm requires a parameter to indicate the time slice. Multilevel response queues require parameters
Q. Illustrate the Operating System Components? Modern operating systems share the goal of supporting system components. System components are: 1. Process Management 2.
what is exit status
What is linked allocation, as detailed in text? Directory has pointers to first and last blocks of file. Every block of file (except last) has pointer to the next block.
Define multithreading The proficiency of an operating system to execute different parts of a program called threads simultaneously is called as multithreading. A thread is a fl
FIFO page replacement algorithm with example
code for implementing NFU page replacement algorithm
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