Non-Preemptive Scheduling Algorithms

Scheduling algorithms are used to allocate resources to different processes in an operating system. Non-preemptive scheduling algorithms are those in which once a process is allocated a resource, it cannot be interrupted until it completes its execution or releases the resource voluntarily.

First-In First-Out (FIFO) Scheduling

FIFO scheduling is a non-preemptive scheduling algorithm in which the processes are scheduled according to their arrival time. The process that arrives first is allocated resources first and completes its execution before the next process is scheduled.

Features of FIFO Scheduling

- Non-preemptive: Once a process is allocated a resource, it cannot be interrupted until it completes its execution or voluntarily releases the resource.
- Simple: FIFO scheduling is easy to implement and understand.
- Fair: Since processes are scheduled according to their arrival time, the algorithm is fair in terms of resource allocation.

Other Scheduling Algorithms

- Round Robin: Round robin is a preemptive scheduling algorithm in which each process is allocated a fixed time slice and the CPU switches between processes after each time slice.
- Multilevel Queue Scheduling: Multilevel queue scheduling is a scheduling algorithm in which processes are assigned to different queues based on their characteristics such as priority or type of process. Each queue has its own scheduling algorithm.
- Multilevel Queue Scheduling with Feedback: This is an extension of multilevel queue scheduling in which processes can move between queues based on their behavior.

Conclusion

In conclusion, the non-preemptive scheduling algorithm is First-In First-Out (FIFO) scheduling. This algorithm is simple, fair, and easy to understand. Other scheduling algorithms like round robin, multilevel queue scheduling, and multilevel queue scheduling with feedback are preemptive and have different characteristics based on the requirements of the system.