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Added test cases using random number generator
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Pratyush219
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@ -2,58 +2,80 @@
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* @file fcfs_scheduling.cpp
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* @brief Implementation of FCFS CPU scheduling algorithm
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* @details
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* FCFS is a non-preemptive CPU scheduling algorithm in which whichever process
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* arrives first, gets executed first. If two or more processes arrive
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* simultaneously, the process with smaller process ID gets executed first.
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* FCFS is a non-preemptive CPU scheduling algorithm in which whichever process arrives first, gets executed first.
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* If two or more processes arrive simultaneously, the process with smaller process ID gets executed first.
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* @link https://bit.ly/3ABNXOC
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* @author Pratyush Vatsa(https://github.com/Pratyush219)
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*/
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*/
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#include <iomanip> // for formatting the output
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#include <iostream> // for IO operations
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#include <queue> // for priority_queue
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#include <unordered_set> // for using unordered_set
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#include <vector> // for using vector
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#include <iostream> // for IO operations
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#include <vector> // for using vector
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#include <unordered_set> // for using unordered_set
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#include <queue> // for priority_queue
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#include <iomanip> // for formatting the output
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#include <cstdlib> // random number generation
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#include <algorithm> // for sorting
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#include <cassert> //for assert
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#include <ctime> // for time
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using std::cin;
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using std::cout;
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using std::endl;
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using std::get;
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using std::left;
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using std::make_tuple;
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using std::priority_queue;
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using std::tuple;
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using std::unordered_set;
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using std::make_tuple;
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using std::vector;
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using std::tuple;
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using std::endl;
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using std::left;
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using std::rand;
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using std::srand;
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/**
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* @brief Comparator function for sorting of vector
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* @tparam S Data type of Process ID
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* @tparam T Data type of Arrival time
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* @tparam E Data type of Burst time
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* @param t1 first tuple
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* @param t2 second tuple
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* @returns true if t1 and t2 are in CORRECT ORDER
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* @returns false if t1 and t2 are in INCORRECT ORDER
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*/
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template<typename S, typename T, typename E>
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bool sortcol(tuple<S, T, E>& t1, tuple<S, T, E>& t2){
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if(get<1>(t1) < get<1>(t2)){
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return true;
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}
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else if(get<1>(t1) == get<1>(t2) && get<0>(t1) < get<0>(t2)){
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return true;
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}
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return false;
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}
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/**
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/**
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* @class Compare
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* @brief Comparator class for priority queue
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* @tparam S: Data type of Process ID
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* @tparam T: Data type of Arrival time
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* @tparam E: Data type of Burst time
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*/
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template <typename S, typename T, typename E>
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class Compare {
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public:
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* @tparam S Data type of Process ID
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* @tparam T Data type of Arrival time
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* @tparam E Data type of Burst time
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*/
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template<typename S, typename T, typename E>
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class Compare{
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public:
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/**
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* @param t1: first tuple
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* @param t2: second tuple
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* @brief A comparator function that checks whether to swap the two tuples
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* or not.
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* @link Refer
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* https://www.geeksforgeeks.org/comparator-class-in-c-with-examples/ for
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* detailed description of comparator
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* @returns true if the tuples should be swapped, false othewise
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*/
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bool operator()(tuple<S, T, E, double, double, double>& t1,
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tuple<S, T, E, double, double, double>& t2) {
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* @param t1 first tuple
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* @param t2 second tuple
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* @brief A comparator function that checks whether to swap the two tuples or not.
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* @link Refer to https://www.geeksforgeeks.org/comparator-class-in-c-with-examples/ for detailed description of comparator
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* @returns true if the tuples SHOULD be swapped
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* @returns false if the tuples SHOULDN'T be swapped
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*/
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bool operator () (tuple<S, T, E, double, double, double>& t1, tuple<S, T, E, double, double, double>& t2){
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// Compare arrival times
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if (get<1>(t2) < get<1>(t1)) {
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if(get<1>(t2) < get<1>(t1)){
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return true;
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}
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// If arrival times are same, then compare Process IDs
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else if (get<1>(t2) == get<1>(t1)) {
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else if(get<1>(t2) == get<1>(t1)){
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return get<0>(t2) < get<0>(t1);
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}
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return false;
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@ -63,12 +85,12 @@ class Compare {
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/**
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* @class FCFS
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* @brief Class which implements the FCFS scheduling algorithm
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* @tparam S: Data type of Process ID
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* @tparam T: Data type of Arrival time
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* @tparam E: Data type of Burst time
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*/
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template <typename S, typename T, typename E>
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class FCFS {
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* @tparam S Data type of Process ID
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* @tparam T Data type of Arrival time
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* @tparam E Data type of Burst time
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*/
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template<typename S, typename T, typename E>
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class FCFS{
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/**
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* Priority queue of schedules(stored as tuples) of processes.
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* In each tuple
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@ -78,73 +100,62 @@ class FCFS {
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* 4th element: Completion time
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* 5th element: Turnaround time
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* 6th element: Waiting time
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*/
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priority_queue<tuple<S, T, E, double, double, double>,
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vector<tuple<S, T, E, double, double, double>>,
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Compare<S, T, E>>
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schedule;
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*/
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priority_queue<tuple<S, T, E, double, double, double>, vector<tuple<S, T, E, double, double, double>>, Compare<S, T, E>> schedule;
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// Stores final status of all the processes after completing the execution.
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vector<tuple<S, T, E, double, double, double>> result;
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// Stores process IDs. Used for confirming absence of a process while adding
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// it.
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vector<tuple<S, T, E, double, double, double>> result;
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// Stores process IDs. Used for confirming absence of a process while adding it.
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unordered_set<S> idList;
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public:
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public:
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/**
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* @brief adds the process to the ready queue if it isn't already there
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* @param ID: Process ID
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* @param arrival: Arrival time of the process
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* @param burst: Burst time of the process
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* @param ID Process ID
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* @param arrival Arrival time of the process
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* @param burst Burst time of the process
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* @returns void
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*
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*/
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void addProcess(S id, T arrival, E burst) {
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*
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*/
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void addProcess(S id, T arrival, E burst){
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// Add if a process with process ID as id is not found in idList.
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if (idList.find(id) == idList.end()) {
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tuple<S, T, E, double, double, double> t =
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make_tuple(id, arrival, burst, 0, 0, 0);
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if(idList.find(id) == idList.end()) {
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tuple<S, T, E, double, double, double> t = make_tuple(id, arrival, burst, 0, 0, 0);
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schedule.push(t);
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idList.insert(id);
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}
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}
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/**
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* @brief Algorithm for scheduling CPU processes according to the First Come
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* First Serve(FCFS) scheduling algorithm.
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*
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* @description FCFS is a non-preemptive algorithm in which the process
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* which arrives first gets executed first. If two or more processes arrive
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* together then the process with smaller process ID runs first (each
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* process has a unique proces ID).
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*
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* I used a min priority queue of tuples to accomplish this task. The
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* processes are ordered by their arrival times. If arrival times of some
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* processes are equal, then they are ordered by their process ID.
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*
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* @brief Algorithm for scheduling CPU processes according to the First Come First Serve(FCFS) scheduling algorithm.
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*
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* @description FCFS is a non-preemptive algorithm in which the process which arrives first gets executed first. If two or
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* more processes arrive together then the process with smaller process ID runs first (each process has a unique proces ID).
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*
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* I used a min priority queue of tuples to accomplish this task. The processes are ordered by their arrival times. If arrival
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* times of some processes are equal, then they are ordered by their process ID.
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*
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* @returns void
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*/
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void scheduleForFcfs() {
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*/
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vector<tuple<S, T, E, double, double, double>> scheduleForFcfs(){
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// Variable to keep track of time elapsed so far
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double timeElapsed = 0;
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while (!schedule.empty()) {
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while(!schedule.empty()){
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tuple<S, T, E, double, double, double> cur = schedule.top();
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// If the next process arrived at time t2, the last process
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// completed its execution at time t1, and t2 > t1.
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if (get<1>(cur) > timeElapsed) {
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// If the current process arrived at time t2, the last process completed its execution at time t1, and t2 > t1.
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if(get<1>(cur) > timeElapsed){
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timeElapsed += get<1>(cur) - timeElapsed;
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}
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// Add Burst time to time elapsed
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timeElapsed += get<2>(cur);
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// Completion time of the current process will be same as time
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// elapsed so far
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// Completion time of the current process will be same as time elapsed so far
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get<3>(cur) = timeElapsed;
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// Turnaround time = Completion time - Arrival time
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get<4>(cur) = get<3>(cur) - get<1>(cur);
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@ -154,53 +165,96 @@ class FCFS {
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result.push_back(cur);
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schedule.pop();
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}
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printResult();
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return result;
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}
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/**
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* @brief Utility function for printing the status of each process after
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* execution
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* @brief Utility function for printing the status of each process after execution
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* @returns void
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*/
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void printResult() {
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cout << "Status of all the proceses post completion is as follows:"
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<< endl;
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*/
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void printResult(){
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cout << "Status of all the proceses post completion is as follows:" << endl;
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cout << std::setw(17) << left << "Process ID" << std::setw(17) << left
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<< "Arrival Time" << std::setw(17) << left << "Burst Time"
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<< std::setw(17) << left << "Completion Time" << std::setw(17)
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<< left << "Turnaround Time" << std::setw(17) << left
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<< "Waiting Time" << endl;
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for (size_t i{}; i < result.size(); i++) {
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cout << std::setprecision(2) << std::fixed << std::setw(17) << left
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<< get<0>(result[i]) << std::setw(17) << left
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<< get<1>(result[i]) << std::setw(17) << left
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<< get<2>(result[i]) << std::setw(17) << left
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<< get<3>(result[i]) << std::setw(17) << left
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<< get<4>(result[i]) << std::setw(17) << left
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<< get<5>(result[i]) << endl;
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cout << std::setw(17) << left << "Process ID"
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<< std::setw(17) << left << "Arrival Time"
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<< std::setw(17) << left << "Burst Time"
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<< std::setw(17) << left << "Completion Time"
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<< std::setw(17) << left << "Turnaround Time"
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<< std::setw(17) << left << "Waiting Time" << endl;
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for(size_t i{}; i < result.size(); i++){
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cout << std::setprecision(2) << std::fixed
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<< std::setw(17) << left << get<0>(result[i])
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<< std::setw(17) << left << get<1>(result[i])
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<< std::setw(17) << left << get<2>(result[i])
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<< std::setw(17) << left << get<3>(result[i])
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<< std::setw(17) << left << get<4>(result[i])
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<< std::setw(17) << left << get<5>(result[i]) << endl;
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}
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}
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};
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template<typename S, typename T, typename E>
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vector<tuple<S, T, E, double, double, double>> get_final_status(vector<tuple<uint32_t, uint32_t, uint32_t>>& input){
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sort(input.begin(), input.end(), sortcol<S, T, E>);
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vector<tuple<S, T, E, double, double, double>> result(input.size());
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double timeElapsed = 0;
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for(size_t i{}; i < input.size(); i++){
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T arrival = get<1>(input[i]);
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E burst = get<2>(input[i]);
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if(arrival > timeElapsed){
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timeElapsed += arrival - timeElapsed;
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}
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timeElapsed += burst;
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double completion = timeElapsed;
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double turnaround = completion - arrival;
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double waiting = turnaround - burst;
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get<0>(result[i]) = get<0>(input[i]);
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get<1>(result[i]) = arrival;
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get<2>(result[i]) = burst;
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get<3>(result[i]) = completion;
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get<4>(result[i]) = turnaround;
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get<5>(result[i]) = waiting;
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}
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return result;
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}
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void test(){
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for(int i{}; i < 1000; i++){
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srand(time(0));
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int n = 1 + rand()%1000;
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FCFS<uint32_t ,uint32_t, uint32_t> readyQueue;
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vector<tuple<uint32_t, uint32_t, uint32_t>> input(n);
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for(int i{}; i < n; i++){
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get<0>(input[i]) = i;
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srand(time(0));
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get<1>(input[i]) = 1 + rand()%10000;
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srand(time(0));
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get<2>(input[i]) = 1 + rand()%10000;
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}
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for(uint32_t i{}; i < n; i++){
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readyQueue.addProcess(get<0>(input[i]), get<1>(input[i]), get<2>(input[i]));
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}
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vector<tuple<uint32_t ,uint32_t, uint32_t, double, double, double>> res = get_final_status<uint32_t ,uint32_t, uint32_t>(input);
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assert(res == readyQueue.scheduleForFcfs());
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// readyQueue.printResult();
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}
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cout << "All tests passed" << endl;
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}
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/**
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* @brief Entry point of the program
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* @returns 0 on exit
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*/
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int main() {
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FCFS<uint32_t, uint32_t, uint32_t> readyQueue;
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// Sample test case
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int n = 3;
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vector<tuple<uint32_t, uint32_t, uint32_t>> input = {
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make_tuple(1, 0, 30), make_tuple(2, 0, 5), make_tuple(3, 0, 5)};
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for (uint32_t i{}; i < n; i++) {
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readyQueue.addProcess(get<0>(input[i]), get<1>(input[i]),
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get<2>(input[i]));
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}
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readyQueue.scheduleForFcfs();
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*/
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int main(){
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test();
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return 0;
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}
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