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Precision of floating point numbers Using these functions floor(), ceil(), trunc(), round() and setprecision() in C++ function overloading in C++ Add two numbers using the function in C++ Advantage and disadvantage friend function C++ ATM machine program in C++ using functions Returning Multiple Values from a function using Tuple and Pair in C++ Find the Size of Array in C/C++ without using sizeof() function Pure Virtual function in C++ With Example Program Returning a function Pointer from a function in C/C++ Passing a Vector to a function in C++ functions in C++ With Types and Examples C++ Macro function Example Using Default Arguments with Virtual functions Virtual functions and Runtime Polymorphism Fesetround() and Fegetround() in C++ and their application Object as function Argument in C++ Private Member function in C++ Function Overriding in C++ C++ Program for Addition of Two Numbers Using functions function Object in C++ Elements of User Defined function in C++ Inline Functions in C++ Virtual Function in C++

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How To

How to concatenate two strings in C++ How to Reverse a String in C++ using Do-While Loop How to Reverse a String in C++ using for Loop How to Reverse a String in C++ using While Loop How to create a table in C++ How to Setup Environment for C++ Programming on Mac How to call a void function in C++ How to create a directory or folder in C/C++ How to create a library in C++ How to create a stack in C++ How to create the Processes with fork in C++ How to Handle Divide by Zero Exception in C++ How to Declare Unordered Sets in C++ How to Sort an Array in C++ How to run program in turbo c++ How to Use Getline in C++ How is Multiset Implemented in C++ How to Build a Program in C++ How to Declare a 2d Array Dynamically in C++ How to create a button in C++ How the value is passed in C++ How to calculate size of string in C++ How to convert binary string to int in C++ How to convert string to float in C++ How to remove space from string in C++ How to use pair in C++ How to use the string find() in C++ How to Remove an Element From an Array in C++ How to Take Space Separated input in C++ How to Copy in Turbo C++ How to Use Pow in C++ How to Use Set in C++ How to Create Singleton Class in C++ How to Allocate Memory Dynamically in C++ How to Close Turbo C++ in Windows 10 How to Use Modulus in C++

C++ Questions

What does Buffer Flush mean in C++ What is endl in C++ What is Unary Operator Overloading in C++ Which operators cannot be overloaded in C++ What is Static Member function in C++ What is This Pointer in C++ What is Upcasting in C++ What Kind of Exceptions Are Available in C++ What is Memory Allocation for Objects in C++ What is a Linked List in C++ is assignment operator inherited in C++ When should we write own Assignment operator in C++ What is an Object in C++ What is Copy Constructor in C++ What is a Static Member Function in C++

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C++ Program For FCFS (First Come First Serve)
2023-01-01 02:18:56

C++ Program For FCFS (First Come First Serve)

The most basic scheduling technique is FCFS, often known as "FIFO (First In, First Out)". In this procedure, the first one is utilized and executed first, while the second one begins only when the prior one has been finished and fully executed.

FCFS (First Come, First Serve) in the C++ programming language is a non-pre-emptive scheduling mechanism. The FIFO method prioritizes processes based on the sequence in which users request the processor. The CPU is allotted to the process that wants it first. This is simple to build, using a FIFO queue to manage the tasks.

As the process arrives, it is placed at the bottom of the queue. When a job is completed, the CPU deletes it from the queue and continues with the next task.

The First Come First Serve (FCFS) algorithm employs the following terms:

1. Completion Time (C.T.): The period of time taken until the process is finished.

2. Waiting Time (W.T.): The time difference between the burst time (B.T.) and the turnaround time (T.A.T.). Waiting Time (W.T.) = T.A.T (Time Around Time) – B.T (Burst Time)

3. Turn Around Time (T.A.T.): The time difference between the arrival time (A.T.) and the completion time (C.T.). Turn Around Time (T.A.T) = C.T (Completion Time) – A.T (Arrival Time)

We assumed arrival time = 0, thus completion time and turn-around time are the same.

Example

/* FCFS implementation code is written in the C++ programming language. */
#include<iostream>
using namespace std;
 /* Function for calculating the total waiting_time for all the processes */
void find_Waiting_Time(int process[], int n, int b_t[], int w_t[])
{
   	 // waiting time for first process is 0
    	w_t[0] = 0;
 	// calculating waiting time
    	for (int  x = 1; x < n ; x++ )
        	w_t[x] =  b_t[x-1] + w_t[x-1] ;
}
 
/* Calculating turn_around time using this function */
void find_TurnAround_Time( int process[], int n, int b_t[], int w_t[], int ta_t[])
{
    	/* adding b_t[x] + w_t[x] to calculate the turn_around time */
    	for (int x = 0; x < n ; x++)
        	ta_t[x] = b_t[x] + w_t[x];
}
 
/* Calculating avg_time time using this function */
void find_avg_Time( int process[], int n, int b_t[])
{
    	int w_t[n], ta_t[n], wt_total = 0, tat_total = 0;
 	/* Function for calculating the waiting_time of all the operations */
    	find_Waiting_Time(process, n, b_t, w_t);
 	/* Function for calculating turn_around time for all the processes available */   	find_TurnAround_Time(process, n, b_t, w_t, ta_t);
 	/* Display all the procedures with all the available details */
    	cout << "Processes  "<< " Burst time  "
         	<< " Waiting time  " << " Turn around time\n";
 	/* The total_turn_around time and the total_wait time should be calculated */
    	for (int  x=0; x<n; x++)
    	{
        		wt_total = wt_total + w_t[x];
        		tat_total = tat_total + ta_t[x];
        		cout << "   " << x+1 << "\t\t" << b_t[x] <<"\t    "
            	<< w_t[x] <<"\t\t  " << ta_t[x] <<endl;
    	}
 
    	cout << "Average waiting time = "
         	<< (float)wt_total / (float)n;
    	cout << "\nAverage turn around time = "
         	<< (float)tat_total / (float)n;
}
 
int main()
{
    	/*  identifiers for all the processes */
    	int process[] = { 1, 2, 3};
    	int n = sizeof process / sizeof process[0];
 	/* burst_time of all the available processes */
    	int  burst_time[] = {10, 5, 8};
 	find_avg_Time(process, n,  burst_time);
    	return 0;
}

Output:

C++ Program For (FCFS) FIRST COME FIRST SERVE

How is it Implemented?

  1. Enter the processes and their b_t (burst time).
  2. Determine the w_t (waiting time) for all the processes.
  3. Because the first process that arrives does not need to wait, w_t[0] = 0, i.e., the waiting time for process 1 is zero.
  4. Determine the waiting time for all the other processes, i.e., for process i:
w_t[i] = b_t[i-1] + w_t[i-1].
  1. Calculate turnaround time for all processes as (waiting_time) + (burst_time). 
  2. Find the average waiting time by (total_waiting_time) / (no_of_processes).
  3. Similarly, the average turn-around time is calculated as (total_turn_around_time) / (no_of_processes). 

Some Important points on First Come First Serve (FCFS):

  1. FCFS (First Come, First Serve) in the C++ language is a non-preemptive system.
  2. The average wait time for FCFS (First Come, First Serve) is insufficient.
  3. Resources cannot be used concurrently:

The results that in the Convoy effect (Imagine a situation with multiple I/O (input/output) bound processes and only one CPU bound process. The I/O (input/output) bound processes must wait until the CPU bound process receives the CPU. The I/O (input/output) bound process should have used the CPU for a while before using I/O (input/output) devices).