![]() Using this algorithm, the CPU process works in a similar manner. This will continue until the last person in the queue purchases the ticket. The person who arrives first in the queue first buys the ticket and then the next one. ![]() In this scheduling algorithm, a person is served according to the queue manner. This method is poor in performance, and the general wait time is quite high.Ī real-life example of the FCFS method is buying a movie ticket on the ticket counter.Jobs are always executed on a first-come, first-serve basis.It supports non-preemptive and pre-emptive scheduling algorithm.How FCFS Works? Calculating Average Waiting Time.In this operating system tutorial, you will learn: The full form of FCFS is First Come First Serve.Īs the process enters the ready queue, its PCB (Process Control Block) is linked with the tail of the queue and, when the CPU becomes free, it should be assigned to the process at the beginning of the queue. In this type of algorithm, processes which requests the CPU first get the CPU allocation first. It is the easiest and simplest CPU scheduling algorithm. First Come First Serve (FCFS) is an operating system scheduling algorithm that automatically executes queued requests and processes in order of their arrival.
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