![]() Finally, all the movements are added to get the total head movement. The movement between the requests is calculated by taking the absolute value of the difference between the values at consecutive index positions of the array. In FCFS disk scheduling algorithm program the order of requests is stored in the req array. In this scheduling, CPU schedules the processes on the basis of their arrival time. ![]() Printf("total head movement = %d\n",mov) The FCFS scheduling technique is the simplest scheduling algorithm. Printf("enter the number of requests\n") ![]() Req – array for taking the request, mov – to calculate total head movement FCFS Disk Scheduling Algorithm Program in C #include FCFS algorithm program in C is implemented below Variable description for the program for FCFS disk scheduling algorithm For more details refer Page Replacement Algorithms. ![]() For example, if the order of I/O requests is 10, 40, 20, 50, 35 and the current head position is 45, then the order of fulfilling the requests will beīecause the first request was for sector 10, then 40 and so on. ![]() First Come First Serve (FCFS) disk scheduling algorithm serves the incoming requests in order i.e., the request which came first will be satisfied first. The aim is to minimize the seek time i.e., the time to move from one sector to another. Disk scheduling algorithms are used to come with an order in which the I/O read/write requests by the different process should be satisfied. ![]()
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