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What are the three main purposes of an operating system?
_ To give an environment for a computer user to implement programs on computer hardware in a convenient and efficient manner.
_ To allocate the separate resources of the computer as required solving the problem given. The allocation process should be as fair and efficient as possible.
_ As a control program it serves two major functions: (1) supervision of the implementation of user programs to stop errors and improper use of the computer, and (2) management of the operation and control of I/O devices.
Parent and Child process communicate in unix A child and parent can interact through any of the normal inter-process communication schemes (pipes, message queues, sockets, s
Entry-sequenced file organization The records in an entry-sequenced file are store up in the order they are written into the file. New records are for all time appended to
Describe the differences among short-term, medium-term, and long-term scheduling. Short-term (CPU scheduler)-selects from jobs in memory those jobs that are ready to execu
Determining the time quantum for a job is a critical task. Given the assumptions that the average switching time between processes is s, and the average amount of time an I/O bo
Explain thread in details
advantages and disadvantages of monolithic and layered approach
Differentiate pre-emptive and non-preemptive scheduling In a pre-emptive scheduling technique, CPU can be taken away from a process if there is a requirement while in a non-pre
What is an operating system and what are the different types of operating systems? Operating System An Operating System or OS is a software program that allows the compute
Concept of Reentrancy It is a useful, memory-saving method for multiprogrammed timesharing machines. A Reentrant method is one in which multiple clients can share a singl
What are scheduling queues? Since the processes enter the system they are put into job queue. This queue contains all processes in the system. The processes that are exist in m
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