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What are the services provided by the operating systems?
Program Development
It provides a variety of services and facilities, such as debuggers and editor, to help the programmer in creating programs.
Program execution
It handles scheduling duties like implementation of programs and loading instruction and data into the main memory. Initializing files and I/O device.
Access to I/O devices
OS provides a uniform interface that covers the inner details, thus that the programmer can access any device using simple read and writes.
Controlled access to files
For multiple users it provides protection system to access the file. It controls the right to use of the system and resources. It protects data and resources from unauthorized users.
Error detection and response
OS provides response that clears both external and internal hardware errors.
The procedure for handling the page fault is as follows 1. We check the internal table to verify whether the reference was valid or invalid. 2. If the reference was invalid,
Define Overflow Chaining Another method will divide the pre-allocated table into two sections: the primary area to determine which keys are mapped and an area for collisions, g
Q. Show the services which provided by operating system? A) Resource Allocation: If there are more than one user or jobs running at the same instance then resource
Q. Illustrate the function of Loader? A loader is a routine which loads an object program and prepares it for execution. There are many loading schemes: relocating, absolute an
VoIP (Voice over Internet Protocol), also called Internet telephone, was once a novelty on the Internet, but not very useful because of all the problems with poor voice quality and
What are the allocation methods of a disk space? Methods of allocating disk space which are widely in use are a. Contiguous allocation b. Linked allocation c. Indexed
Q. Show that a few schedules are possible under the two-phase locking protocol however not possible under the timestamp protocol and vice versa. Answer: A schedule that is auth
Direct memory access Many computers avoid burdening the main CPU with programmed I/O by offloading sine if this work to a special-purpose processor known as a direct memory add
What do you mean by system calls? System calls give the interface among a process and the operating system. When a system call is implemented, it is treated as by the hardware
Explain Swapping Swapping is a method of temporarily removing inactive programs from the memory of computer system.
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