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round-robin.js
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round-robin.js
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import Queue from '../queue.js';
function roundRobin(processes, timeQuantum, contextSwitchingTime = 0) {
// timer will keep track of the time each process is ran
// timer will start from 0
let timer = 0;
// create a copy of original data
let tempProcesses = processes.map((process) => {
return { ...process };
});
// creating a ready queue
// sort the processes according to the arival times
let readyQueue = new Queue(tempProcesses);
// output array is used to display the output
let output = [];
// keeping track of previous process
let prev = null;
// iterating over each process
while (!readyQueue.isEmpty()) {
// get the process from the ready queue
let process = readyQueue.peek();
// check if the process arrived or not
if (process.arrivalTime > timer) {
timer++;
continue;
}
// check for context switching time and increment the timer
if (process.name !== prev) {
timer += contextSwitchingTime;
}
// update previous process
prev = process.name;
// give the response time
if (process.responseTime === null || process.responseTime === undefined) {
process.responseTime = timer - process.arrivalTime;
}
// run the process for the CPU Burst time
if (process.estimateCPUBurstTime <= timeQuantum) {
timer += process.estimateCPUBurstTime;
process.estimateCPUBurstTime = 0;
} else {
timer += timeQuantum;
process.estimateCPUBurstTime = process.estimateCPUBurstTime - timeQuantum;
}
// update the ready queue
readyQueue.enqueue(readyQueue.dequeue());
if (process.estimateCPUBurstTime <= 0) {
// process completion time
process.completionTime = timer;
// turn-around time
process.turnAroundTime = process.completionTime - process.arrivalTime;
// waiting time
process.waitingTime =
process.turnAroundTime -
processes.find((p) => p.name === process.name).estimateCPUBurstTime;
// terminate the process
process.terminated = true;
// update previous process
prev = process.name;
// remove from ready queue
readyQueue.removeProcess(process);
// put in the output array
output.push(process);
}
}
console.table(output.sort((a, b) => a.arrivalTime - b.arrivalTime));
return output.sort((a, b) => a.arrivalTime - b.arrivalTime);
}
export default roundRobin;