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FCFS CPU Scheduling

FCFS (First-Come-First-Serve) CPU Scheduling is a scheduling algorithm used by operating systems to determine the order in which processes are executed by the CPU.

In this algorithm, the process that arrives first is executed first, and the CPU continues to execute the processes in the order of their arrival time. Once a process is assigned to the CPU, it continues to execute until it finishes or until it is preempted by a higher-priority process.

FCFS is a non-preemptive algorithm, which means that a process is not interrupted once it starts executing on the CPU, unless it voluntarily relinquishes the CPU, or until it finishes its execution. This scheduling algorithm is easy to implement and ensures that the processes are executed in the order in which they arrived, but it can lead to poor performance if long-running processes arrive first, as they may monopolize the CPU, causing other processes to wait for an extended period of time.

Overall, FCFS is a simple, easy-to-understand algorithm that is best suited for scenarios where there is low process arrival rate and short CPU bursts.

Here given code implementation process.

// C program 
// Implementation of First Come First Served (FCFS) Scheduling
#include <stdio.h>

//This is calculating the average time by using given process and burst time
void find_avg_time(int processes[], int burst_time[], int n)
{
	// Auxiliary space to store waiting time and turnaround time
	int turnaround_time[n];
	int waiting_time[n];
	//Resultant variable
	double total_waiting_time = 0;
	double total_turnaround_time = 0;
	//Loop control variable
	int i = 0;
	// Initial waiting time are zero
	waiting_time[i] = 0;
	// Calculate waiting time and turnaround time 
	for (i = 0; i < n; ++i)
	{
		// Get turn around time for ith processes
		turnaround_time[i] = burst_time[i] + waiting_time[i];
		if (i + 1 < n)
		{
			// Get waiting time of next processes
			waiting_time[i + 1] = turnaround_time[i];
		}
	}
	printf(" (Process) (Burst Time) (Waiting Time) (Turn Around Time)");
	// Display process ,burst time, waiting time, turn around time ,
	// And calculate the average waiting time and average turn around time
	for (i = 0; i < n; i++)
	{
		// Calculate waiting time
		total_waiting_time += waiting_time[i];
		// Calculate turnaround time 
		total_turnaround_time += turnaround_time[i];
		printf("\n  %d \t\t%d \t\t%d \t\t%d ", (i + 1), burst_time[i], waiting_time[i], turnaround_time[i]);
	}
	//Display Result 
	printf("\n Average Waiting Time  : %lf", (total_waiting_time / n));
	printf("\n Average Turn Around Time  : %lf\n", (total_turnaround_time / n));
}
int main()
{
	//Process set
	int processes[] = {
		1,
		2,
		3,
		4,
		5
	};
	//Burst time of process set  
	int burst_time[] = {
		7,
		9,
		11,
		4,
		8
	};
	// Assume that size of process and burst time is equal
	// Get size
	int n = sizeof processes / sizeof processes[0];
	find_avg_time(processes, burst_time, n);
	return 0;
}

Output

 (Process) (Burst Time) (Waiting Time) (Turn Around Time)
  1 		7 		0 		7
  2 		9 		7 		16
  3 		11 		16 		27
  4 		4 		27 		31
  5 		8 		31 		39
 Average Waiting Time  : 16.200000
 Average Turn Around Time  : 24.000000
// Java program 
// Implementation of First Come First Served (FCFS) Scheduling
class FcfsScheduling
{
	//This is calculating the average time by using given process and burst time
	public void find_avg_time(int[] processes, int[] burst_time, int n)
	{
		// Auxiliary space to store waiting time and turnaround time
		int[] turnaround_time = new int[n];
		int[] waiting_time = new int[n];
		//Resultant variable
		double total_waiting_time = 0;
		double total_turnaround_time = 0;
		//Loop control variable
		int i = 0;
		// Initial waiting time are zero
		waiting_time[i] = 0;
		// Calculate waiting time and turnaround time 
		for (i = 0; i < n; ++i)
		{
			// Get turn around time for ith processes
			turnaround_time[i] = burst_time[i] + waiting_time[i];
			if (i + 1 < n)
			{
				// Get waiting time of next processes
				waiting_time[i + 1] = turnaround_time[i];
			}
		}
		System.out.print(" (Process) (Burst Time) (Waiting Time) (Turn Around Time)");
		// Display process ,burst time, waiting time, turn around time  
		// And calculate the average waiting time and average turn around time
		for (i = 0; i < n; i++)
		{
			// Calculate waiting time
			total_waiting_time += waiting_time[i];
			// Calculate turnaround time 
			total_turnaround_time += turnaround_time[i];
			System.out.print("\n " + (i + 1) + " \t\t" + burst_time[i] + " \t\t" + waiting_time[i] + " \t\t" + turnaround_time[i] + " ");
		}
		//Display Result 
		System.out.print("\n Average Waiting Time : " + (total_waiting_time / n));
		System.out.print("\n Average Turn Around Time : " + (total_turnaround_time / n) + "\n");
	}
	public static void main(String args[])
	{
		FcfsScheduling obj = new FcfsScheduling();
		//Process set
		int[] processes = {
			1,
			2,
			3,
			4,
			5
		};
		//Burst time of process set  
		int[] burst_time = {
			7,
			9,
			11,
			4,
			8
		};
		// Assume that size of process and burst time is equal
		// Get size
		int n = processes.length;
		obj.find_avg_time(processes, burst_time, n);
	}
}

Output

 (Process) (Burst Time) (Waiting Time) (Turn Around Time)
 1 		7 		0 		7
 2 		9 		7 		16
 3 		11 		16 		27
 4 		4 		27 		31
 5 		8 		31 		39
 Average Waiting Time : 16.2
 Average Turn Around Time : 24.0
//Include header file
#include <iostream>
using namespace std;

// C++ program 
// Implementation of First Come First Served (FCFS) Scheduling

class FcfsScheduling
{
	public:
		//This is calculating the average time by using given process and burst time
		void find_avg_time(int processes[], int burst_time[], int n)
		{
			// Auxiliary space to store waiting time and turnaround time
			int turnaround_time[n];
			int waiting_time[n];
			//Resultant variable
			double total_waiting_time = 0;
			double total_turnaround_time = 0;
			//Loop control variable
			int i = 0;
			// Initial waiting time are zero
			waiting_time[i] = 0;
			// Calculate waiting time and turnaround time 
			for (i = 0; i < n; ++i)
			{
				// Get turn around time for ith processes
				turnaround_time[i] = burst_time[i] + waiting_time[i];
				if (i + 1 < n)
				{
					// Get waiting time of next processes
					waiting_time[i + 1] = turnaround_time[i];
				}
			}
			cout << " (Process) (Burst Time) (Waiting Time) (Turn Around Time)";
			// Display process ,burst time, waiting time, turn around time  
			// And calculate the average waiting time and average turn around time
			for (i = 0; i < n; i++)
			{
				// Calculate waiting time
				total_waiting_time += waiting_time[i];
				// Calculate turnaround time 
				total_turnaround_time += turnaround_time[i];
				cout << "\n " << (i + 1) << " \t\t" << burst_time[i] << " \t\t" << waiting_time[i] << " \t\t" << turnaround_time[i] << " ";
			}
			//Display Result 
			cout << "\n Average Waiting Time : " << (total_waiting_time / n);
			cout << "\n Average Turn Around Time : " << (total_turnaround_time / n) << "\n";
		}
};
int main()
{
	FcfsScheduling obj = FcfsScheduling();
	//Process set
	int processes[] = {
		1 , 2 , 3 , 4 , 5
	};
	//Burst time of process set  
	int burst_time[] = {
		7 , 9 , 11 , 4 , 8
	};
	// Assume that size of process and burst time is equal
	// Get size
	int n = sizeof(processes) / sizeof(processes[0]);
	obj.find_avg_time(processes, burst_time, n);
	return 0;
}

Output

 (Process) (Burst Time) (Waiting Time) (Turn Around Time)
 1 		7 		0 		7
 2 		9 		7 		16
 3 		11 		16 		27
 4 		4 		27 		31
 5 		8 		31 		39
 Average Waiting Time : 16.2
 Average Turn Around Time : 24
//Include namespace system
using System;
// C# program 
// Implementation of First Come First Served (FCFS) Scheduling
class FcfsScheduling
{
	//This is calculating the average time by using given process and burst time
	public void find_avg_time(int[] processes, int[] burst_time, int n)
	{
		// Auxiliary space to store waiting time and turnaround time
		int[] turnaround_time = new int[n];
		int[] waiting_time = new int[n];
		//Resultant variable
		double total_waiting_time = 0;
		double total_turnaround_time = 0;
		//Loop control variable
		int i = 0;
		// Initial waiting time are zero
		waiting_time[i] = 0;
		// Calculate waiting time and turnaround time 
		for (i = 0; i < n; ++i)
		{
			// Get turn around time for ith processes
			turnaround_time[i] = burst_time[i] + waiting_time[i];
			if (i + 1 < n)
			{
				// Get waiting time of next processes
				waiting_time[i + 1] = turnaround_time[i];
			}
		}
		Console.Write(" (Process) (Burst Time) (Waiting Time) (Turn Around Time)");
		// Display process ,burst time, waiting time, turn around time  
		// And calculate the average waiting time and average turn around time
		for (i = 0; i < n; i++)
		{
			// Calculate waiting time
			total_waiting_time += waiting_time[i];
			// Calculate turnaround time 
			total_turnaround_time += turnaround_time[i];
			Console.Write("\n " + (i + 1) + " \t\t" + burst_time[i] + " \t\t" + waiting_time[i] + " \t\t" + turnaround_time[i] + " ");
		}
		//Display Result 
		Console.Write("\n Average Waiting Time : " + (total_waiting_time / n));
		Console.Write("\n Average Turn Around Time : " + (total_turnaround_time / n) + "\n");
	}
	public static void Main(String []args)
	{
		FcfsScheduling obj = new FcfsScheduling();
		//Process set
		int[] processes = {
			1 , 2 , 3 , 4 , 5
		};
		//Burst time of process set  
		int[] burst_time = {
			7 , 9 , 11 , 4 , 8
		};
		// Assume that size of process and burst time is equal
		// Get size
		int n = processes.Length;
		obj.find_avg_time(processes, burst_time, n);
	}
}

Output

 (Process) (Burst Time) (Waiting Time) (Turn Around Time)
 1 		7 		0 		7
 2 		9 		7 		16
 3 		11 		16 		27
 4 		4 		27 		31
 5 		8 		31 		39
 Average Waiting Time : 16.2
 Average Turn Around Time : 24
<?php
// Php program 
// Implementation of First Come First Served (FCFS) Scheduling
class FcfsScheduling
{
	//This is calculating the average time by using given process and burst time
	public	function find_avg_time( & $processes, & $burst_time, $n)
	{
		// Auxiliary space to store waiting time and turnaround time
		$turnaround_time = array_fill(0, $n, 0);
		$waiting_time = array_fill(0, $n, 0);
		//Resultant variable
		$total_waiting_time = 0;
		$total_turnaround_time = 0;
		//Loop control variable
		$i = 0;
		// Initial waiting time are zero
		$waiting_time[$i] = 0;
		// Calculate waiting time and turnaround time 
		for ($i = 0; $i < $n; ++$i)
		{
			// Get turn around time for ith processes
			$turnaround_time[$i] = $burst_time[$i] + $waiting_time[$i];
			if ($i + 1 < $n)
			{
				// Get waiting time of next processes
				$waiting_time[$i + 1] = $turnaround_time[$i];
			}
		}
		echo " (Process) (Burst Time) (Waiting Time) (Turn Around Time)";
		// Display process ,burst time, waiting time, turn around time  
		// And calculate the average waiting time and average turn around time
		for ($i = 0; $i < $n; $i++)
		{
			// Calculate waiting time
			$total_waiting_time += $waiting_time[$i];
			// Calculate turnaround time 
			$total_turnaround_time += $turnaround_time[$i];
			echo "\n ". ($i + 1) ." \t\t". $burst_time[$i] ." \t\t". $waiting_time[$i] ." \t\t". $turnaround_time[$i] ." ";
		}
		//Display Result 
		echo "\n Average Waiting Time : ". ($total_waiting_time / $n);
		echo "\n Average Turn Around Time : ". ($total_turnaround_time / $n) ."\n";
	}
}

function main()
{
	$obj = new FcfsScheduling();
	//Process set
	$processes = array(1, 2, 3, 4, 5);
	//Burst time of process set  
	$burst_time = array(7, 9, 11, 4, 8);
	// Assume that size of process and burst time is equal
	// Get size
	$n = count($processes);
	$obj->find_avg_time($processes, $burst_time, $n);
}
main();

Output

 (Process) (Burst Time) (Waiting Time) (Turn Around Time)
 1 		7 		0 		7
 2 		9 		7 		16
 3 		11 		16 		27
 4 		4 		27 		31
 5 		8 		31 		39
 Average Waiting Time : 16.2
 Average Turn Around Time : 24
// Node Js program 
// Implementation of First Come First Served (FCFS) Scheduling
class FcfsScheduling
{
	//This is calculating the average time by using given process and burst time
	find_avg_time(processes, burst_time, n)
	{
		// Auxiliary space to store waiting time and turnaround time
		var turnaround_time = Array(n).fill(0);
		var waiting_time = Array(n).fill(0);
		//Resultant variable
		var total_waiting_time = 0;
		var total_turnaround_time = 0;
		//Loop control variable
		var i = 0;
		// Initial waiting time are zero
		waiting_time[i] = 0;
		// Calculate waiting time and turnaround time 
		for (i = 0; i < n; ++i)
		{
			// Get turn around time for ith processes
			turnaround_time[i] = burst_time[i] + waiting_time[i];
			if (i + 1 < n)
			{
				// Get waiting time of next processes
				waiting_time[i + 1] = turnaround_time[i];
			}
		}
		process.stdout.write(" (Process) (Burst Time) (Waiting Time) (Turn Around Time)");
		// Display process ,burst time, waiting time, turn around time  
		// And calculate the average waiting time and average turn around time
		for (i = 0; i < n; i++)
		{
			// Calculate waiting time
			total_waiting_time += waiting_time[i];
			// Calculate turnaround time 
			total_turnaround_time += turnaround_time[i];
			process.stdout.write("\n " + (i + 1) + " \t\t" + burst_time[i] + " \t\t" + waiting_time[i] + " \t\t" + turnaround_time[i] + " ");
		}
		//Display Result 
		process.stdout.write("\n Average Waiting Time : " + ((total_waiting_time / n)));
		process.stdout.write("\n Average Turn Around Time : " + ((total_turnaround_time / n)) + "\n");
	}
}

function main()
{
	var obj = new FcfsScheduling();
	//Process set
	var processes = [1, 2, 3, 4, 5];
	//Burst time of process set  
	var burst_time = [7, 9, 11, 4, 8];
	// Assume that size of process and burst time is equal
	// Get size
	var n = processes.length;
	obj.find_avg_time(processes, burst_time, n);
}
main();

Output

 (Process) (Burst Time) (Waiting Time) (Turn Around Time)
 1 		7 		0 		7
 2 		9 		7 		16
 3 		11 		16 		27
 4 		4 		27 		31
 5 		8 		31 		39
 Average Waiting Time : 16.2
 Average Turn Around Time : 24
#  Python 3 program 
#  Implementation of First Come First Served (FCFS) Scheduling

class FcfsScheduling :
	# This is calculating the average time by using given process and burst time
	def find_avg_time(self, processes, burst_time, n) :
		#  Auxiliary space to store waiting time and turnaround time
		turnaround_time = [0] * n
		waiting_time = [0] * n
		# Resultant variable
		total_waiting_time = 0
		total_turnaround_time = 0
		# Loop control variable
		i = 0
		#  Initial waiting time are zero
		waiting_time[i] = 0
		#  Calculate waiting time and turnaround time 
		while (i < n) :
			#  Get turn around time for ith processes
			turnaround_time[i] = burst_time[i] + waiting_time[i]
			if (i + 1 < n) :
				#  Get waiting time of next processes
				waiting_time[i + 1] = turnaround_time[i]
			
			i += 1
		
		print(" (Process) (Burst Time) (Waiting Time) (Turn Around Time)", end = "")
		#  Display process ,burst time, waiting time, turn around time  
		#  And calculate the average waiting time and average turn around time
		i = 0
		while (i < n) :
			#  Calculate waiting time
			total_waiting_time += waiting_time[i]
			#  Calculate turnaround time 
			total_turnaround_time += turnaround_time[i]
			print("\n ", (i + 1) ," \t\t", burst_time[i] ," \t\t", waiting_time[i] ," \t\t", turnaround_time[i] ," ", end = "")
			i += 1
		
		# Display Result 
		print("\n Average Waiting Time : ", (total_waiting_time / n), end = "")
		print("\n Average Turn Around Time : ", (total_turnaround_time / n) ,"\n", end = "")
	

def main() :
	obj = FcfsScheduling()
	# Process set
	processes = [1, 2, 3, 4, 5]
	# Burst time of process set  
	burst_time = [7, 9, 11, 4, 8]
	#  Assume that size of process and burst time is equal
	#  Get size
	n = len(processes)
	obj.find_avg_time(processes, burst_time, n)

if __name__ == "__main__": main()

Output

 (Process) (Burst Time) (Waiting Time) (Turn Around Time)
  1  		 7  		 0  		 7
  2  		 9  		 7  		 16
  3  		 11  		 16  		 27
  4  		 4  		 27  		 31
  5  		 8  		 31  		 39
 Average Waiting Time :  16.2
 Average Turn Around Time :  24.0
#  Ruby program 
#  Implementation of First Come First Served (FCFS) Scheduling
class FcfsScheduling

	# This is calculating the average time by using given process and burst time
	def find_avg_time(processes, burst_time, n)
	
		#  Auxiliary space to store waiting time and turnaround time
		turnaround_time = Array.new(n) {0}
		waiting_time = Array.new(n) {0}
		# Resultant variable
		total_waiting_time = 0.0
		total_turnaround_time = 0.0
		# Loop control variable
		i = 0
		#  Initial waiting time are zero
		waiting_time[i] = 0
		#  Calculate waiting time and turnaround time 
		while (i < n)
		
			#  Get turn around time for ith processes
			turnaround_time[i] = burst_time[i] + waiting_time[i]
			if (i + 1 < n)
			
				#  Get waiting time of next processes
				waiting_time[i + 1] = turnaround_time[i]
			end
			i += 1
		end
		print(" (Process) (Burst Time) (Waiting Time) (Turn Around Time)")
		#  Display process ,burst time, waiting time, turn around time  
		#  And calculate the average waiting time and average turn around time
		i = 0
		while (i < n)
		
			#  Calculate waiting time
			total_waiting_time += waiting_time[i]
			#  Calculate turnaround time 
			total_turnaround_time += turnaround_time[i]
			print("\n ", (i + 1) ," \t\t", burst_time[i] ," \t\t", waiting_time[i] ," \t\t", turnaround_time[i] ," ")
			i += 1
		end
		# Display Result 
		print("\n Average Waiting Time : ", (total_waiting_time / n))
		print("\n Average Turn Around Time : ", (total_turnaround_time / n) ,"\n")
	end
end
def main()

	obj = FcfsScheduling.new()
	# Process set
	processes = [1, 2, 3, 4, 5]
	# Burst time of process set  
	burst_time = [7, 9, 11, 4, 8]
	#  Assume that size of process and burst time is equal
	#  Get size
	n = processes.length
	obj.find_avg_time(processes, burst_time, n)
end
main()

Output

 (Process) (Burst Time) (Waiting Time) (Turn Around Time)
 1 		7 		0 		7 
 2 		9 		7 		16 
 3 		11 		16 		27 
 4 		4 		27 		31 
 5 		8 		31 		39 
 Average Waiting Time : 16.2
 Average Turn Around Time : 24.0

// Scala program 
// Implementation of First Come First Served (FCFS) Scheduling
class FcfsScheduling
{
	//This is calculating the average time by using given process and burst time
	def find_avg_time(processes: Array[Int], burst_time: Array[Int], n: Int): Unit = {
		// Auxiliary space to store waiting time and turnaround time
		var turnaround_time: Array[Int] = Array.fill[Int](n)(0);
		var waiting_time: Array[Int] = Array.fill[Int](n)(0);
		//Resultant variable
		var total_waiting_time: Double = 0;
		var total_turnaround_time: Double = 0;
		//Loop control variable
		var i: Int = 0;
		// Initial waiting time are zero
		waiting_time(i) = 0;
		// Calculate waiting time and turnaround time 
		while (i < n)
		{
			// Get turn around time for ith processes
			turnaround_time(i) = burst_time(i) + waiting_time(i);
			if (i + 1 < n)
			{
				// Get waiting time of next processes
				waiting_time(i + 1) = turnaround_time(i);
			}
			i += 1;
		}
		print(" (Process) (Burst Time) (Waiting Time) (Turn Around Time)");
		// Display process ,burst time, waiting time, turn around time  
		// And calculate the average waiting time and average turn around time
		i = 0;
		while (i < n)
		{
			// Calculate waiting time
			total_waiting_time += waiting_time(i);
			// Calculate turnaround time 
			total_turnaround_time += turnaround_time(i);
			print("\n " + (i + 1) + " \t\t" + burst_time(i) + " \t\t" + waiting_time(i) + " \t\t" + turnaround_time(i) + " ");
			i += 1;
		}
		//Display Result 
		print("\n Average Waiting Time : " + ((total_waiting_time / n)));
		print("\n Average Turn Around Time : " + ((total_turnaround_time / n)) + "\n");
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var obj: FcfsScheduling = new FcfsScheduling();
		//Process set
		var processes: Array[Int] = Array(1, 2, 3, 4, 5);
		//Burst time of process set  
		var burst_time: Array[Int] = Array(7, 9, 11, 4, 8);
		// Assume that size of process and burst time is equal
		// Get size
		var n: Int = processes.length;
		obj.find_avg_time(processes, burst_time, n);
	}
}

Output

 (Process) (Burst Time) (Waiting Time) (Turn Around Time)
 1 		7 		0 		7
 2 		9 		7 		16
 3 		11 		16 		27
 4 		4 		27 		31
 5 		8 		31 		39
 Average Waiting Time : 16.2
 Average Turn Around Time : 24.0
// Swift program 
// Implementation of First Come First Served (FCFS) Scheduling
class FcfsScheduling
{
	//This is calculating the average time by using given process and burst time
	func find_avg_time(_ processes: [Int], _ burst_time: [Int], _ n: Int)
	{
		// Auxiliary space to store waiting time and turnaround time
		var turnaround_time: [Int] = Array(repeating: 0, count: n);
		var waiting_time: [Int] = Array(repeating: 0, count: n);
		//Resultant variable
		var total_waiting_time: Double = 0;
		var total_turnaround_time: Double = 0;
		//Loop control variable
		var i: Int = 0;
		// Initial waiting time are zero
		waiting_time[i] = 0;
		// Calculate waiting time and turnaround time 
		while (i < n)
		{
			// Get turn around time for ith processes
			turnaround_time[i] = burst_time[i] + waiting_time[i];
			if (i + 1 < n)
			{
				// Get waiting time of next processes
				waiting_time[i + 1] = turnaround_time[i];
			}
			i += 1;
		}
		print(" (Process) (Burst Time) (Waiting Time) (Turn Around Time)", terminator: "");
		// Display process ,burst time, waiting time, turn around time  
		// And calculate the average waiting time and average turn around time
		i = 0;
		while (i < n)
		{
			// Calculate waiting time
			total_waiting_time += Double(waiting_time[i]);
			// Calculate turnaround time 
			total_turnaround_time += Double(turnaround_time[i]);
			print("\n ", (i + 1) ," \t\t", burst_time[i] ," \t\t", waiting_time[i] ," \t\t", turnaround_time[i] ," ", terminator: "");
			i += 1;
		}
		//Display Result 
		print("\n Average Waiting Time : ", (total_waiting_time / Double(n)), terminator: "");
		print("\n Average Turn Around Time : ", (total_turnaround_time / Double(n)) ,"\n", terminator: "");
	}
}
func main()
{
	let obj: FcfsScheduling = FcfsScheduling();
	//Process set
	let processes: [Int] = [1, 2, 3, 4, 5];
	//Burst time of process set  
	let burst_time: [Int] = [7, 9, 11, 4, 8];
	// Assume that size of process and burst time is equal
	// Get size
	let n: Int = processes.count;
	obj.find_avg_time(processes, burst_time, n);
}
main();

Output

 (Process) (Burst Time) (Waiting Time) (Turn Around Time)
  1  		 7  		 0  		 7
  2  		 9  		 7  		 16
  3  		 11  		 16  		 27
  4  		 4  		 27  		 31
  5  		 8  		 31  		 39
 Average Waiting Time :  16.2
 Average Turn Around Time :  24.0
Last updated on by Kalkicode




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