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- Question
What are the different job scheduling in operating systems?
- Correct Answer
- Scheduling is the activity of the deciding when process will receive the resources they request FCS ---> FCSFS stands for First Come First Served In FCFS the job that has been waiting the longest is served next Round Robin Scheduling--->Round Robin scheduling is a scheduling method where each process gets a small quantity of time to run and then it is preempted and the next process gets to run This is called time-sharing and gives the effect of all the processes running at the same time Shortest Job First ---> The Shortest job First scheduling algorithm is a nonpreemptive scheduling algorithm that chooses the job that will execute the shortest amount of time Priority Scheduling--->Priority scheduling is a scheduling method where at all times the highest priority process is assigned the resource
- 1. What are operating system services? Discuss
- 2. What is a ready queue? Discuss
- 3. What is a job queue? Discuss
- 4. What is a binary semaphore? Discuss
- 5. What is SCSI? Discuss
- 6. What is a device queue? Discuss
- 7. What is a data register and address register? Discuss
- 8. What are deadlock prevention techniques? Discuss
- 9. What is a Safe State and what is its use in deadlock avoidance? Discuss
- 10. What is the difference between microkernel and macro kernel? Discuss
Operating Systems problems
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Correct Answer: Program execution I/O operations File system manipulation Communication Error detection Resource allocation Accounting Protection
Correct Answer: The processes that are residing in the main memory and are ready and waiting to execute are kept on a list called the ready queue
Correct Answer: When a process enters the system it is placed in the job queue
Correct Answer: A binary semaphore is one, which takes only 0 and 1 as values They are used to implement mutual exclusion and synchronize concurrent processes
Correct Answer: SCSI - Small computer systems interface is a type of interface used for computer components such as hard drives, optical drives, scanners and tape drives It is a competing technology to standard IDE (Integrated Drive Electronics)
Correct Answer: A list of processes waiting for a particular I/O device is called device queue
Correct Answer: Data registers - can be assigned to a variety of functions by the programmer They can be used with any machine instruction that performs operations on data Address registers - contain main memory addresses of data and instructions or they contain a portion of the address that is used in the calculation of the complete addresses
Correct Answer: Mutual exclusion Hold and wait No preemption Circular wait
Correct Answer: When a process requests an available resource, system must decide if immediate allocation leaves the system in a safe state System is in safe state if there exists a safe sequence of all processes Deadlock Avoidance : ensure that a system will never enter an unsafe state
Correct Answer: Micro-kernal : A micro-kernel is a minimal operating system that performs only the essential functions of an operating system All other operating system functions are performed by system processes Monolithic : A monolithic operating system is one where all operating system code is in a single executable image and all operating system code runs in system mode
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