priority shedulling algorithm with preemption in os |priority preemptive
Preemptive Priority CPU Scheduling Algorithm is a pre-emptive method of CPU scheduling algorithm that works based on the priority of a process. In this algorithm, the scheduler schedules the tasks to work as per the priority, which means that a higher priority process should be executed first. In case of any conflict, i.e., when there is more than one process with equal priorities, then the pre-emptive priority CPU scheduling algorithm works on the basis of FCFS (First Come First Serve) algorithm.
How does Preemptive Priority CPU Scheduling Algorithm work?
Step-1: Select the first process whose arrival time will be 0, we need to select that process because that process is only executing at time t=0.
Step-2: Check the priority of the next available process. Here we need to check for 3 conditions.
if priority(current_process) greater than priority(prior_process) :- then execute the current process.
if priority(current_process) less than priority(prior_process) :- then execute the prior process.
if priority(current_process) = priority(prior_process) :- then execute the process which arrives first i.e., arrival time should be first.
Step-3: Repeat Step-2 until it reaches the final process.
Step-4: When it reaches the final process, choose the process which is having the highest priority & execute it. Repeat the same step until all processes complete their execution.
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