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Q. Explain about Functions of Operating System?
Functions of Operating System
Operating system performs 3 functions as follows:
1. Convenience: Operating System makes a computer more convenient to use.
2. Efficiency:Operating System allows computer system resources to be used in an efficient manner.
3. Ability to Evolve: An Operating Systemmust be constructed in such a way as to permit effective development, testing and introduction of new system functions without at the same time interfering with service.
System Service Program system service program Supports and provides the services for other program. System service program perform Varity of tasks. They are further divided in
Define the difference between preemptive and nonpreemptive scheduling. State why strict nonpreemptive scheduling is unlikely to be used in a computer center. Preemptive schedul
Garbage collectors trade space for time. If we collect all the time (which requires a lot of processing time), the GC allocator will use the least memory possible. On the other han
Write a note on the usage of semaphores. Semaphore is a synchronization tool and it is a variable having integer values. It is accessed only by two standard atomic operations w
When you run a program on your UNIX system, the system prepares a special environment for that program. This environment owns everything needed for the system to execute the progra
Define the DosSleep(ms) Function used in the os/2 DosSleep() suspends the currently executing thread for some time interval specified in the ms parameter. If a value of 0 is
Explain the Fork Function Fork function causes a new process to be created. The calling progress is duplicated as an exact copy (called the child process) that differs only in
Q. Consider a calculating environment where a process is given the privilege of accessing object only n times. Suggest a scheme for implementing this policy. Answer: Add an i
how to differentiate scheduling algorithms?
Another solution then would be to keep a pool of threads. Whenever a new task arrives, the system would simply get a thread from pool and set that thread to work on the given task.
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