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scheduler.cpp
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scheduler.cpp
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#include <queue>
#include <iostream>
#include <list>
#include <fstream>
#include <vector>
#include <iomanip>
#include <cstring>
#include <set>
#include <algorithm>
using namespace std;
string inputFilePath;
string rfilePath;
string schedulerType = "FCFS";
int timeQuantum;
int maxPrio = 4;
bool printTransition = false;
bool printAddRmEvent = false;
bool printReadyQ = false;
bool printPreemptProcess = false;
int numDone = 0;
int ofs = 1;
int IOBusy = 0;
int blockStart = 0;
int blockEnd = 0;
enum stateEnum {
READY = 0,
PREEMPT = 1,
RUNNG = 2,
BLOCK = 3,
Done = 4,
CREATED = 5} ;
string getState(int stateEnum) {
switch(stateEnum) {
case READY:
return "READY";
case PREEMPT:
return "PREEMPT";
case RUNNG:
return "RUNNG";
case BLOCK:
return "BLOCK";
case Done:
return "Done";
case CREATED:
return "CREATED";
default:
return "Done";
}
};
vector<int> readRandom(string rfilePath) {
ifstream file(rfilePath);
string line;
vector<int> randVals;
while (getline(file, line)) {
randVals.push_back(stoi(line));
}
return randVals;
};
int assignRandom(int burst, vector<int> randVals) {
if (ofs > randVals[0]) {
ofs = 1;
}
int randVal = 1 + (randVals[ofs] % burst);
ofs++;
return randVal;
}
struct PCB {
public:
int PID;
int AT;
int TC;
int TCInit;
int CB;
int CPUBurst;
int IB;
int IOBurst;
int staticPriority;
int dynamicPriority;
stateEnum state;
int stateTimeStamp;
int nextEventTime;
int runStart;
int startTime;
int finishTime;
int turnAroundTime;
int IOTime;
int CPUWaitTime;
PCB(int processID, int arrivalTime, int totalCPU, int CPB, int IOB, int staticPrio) {
PID = processID;
AT = arrivalTime;
TC = totalCPU;
TCInit = totalCPU;
CB = CPB;
CPUBurst = 0;
IB = IOB;
IOBurst = 0;
staticPriority = staticPrio;
dynamicPriority = staticPrio - 1;
state = CREATED;
stateTimeStamp = arrivalTime;
nextEventTime = 0;
IOTime = 0;
CPUWaitTime = 0;
}
};
queue<PCB*> runQueue;
struct Event {
public:
PCB* evtProcess;
stateEnum oldState;
stateEnum newState;
int evtTimeStamp;
Event(PCB* process, stateEnum transition, int timeStamp) {
evtProcess = process;
oldState = process->state;
newState = transition;
evtTimeStamp = timeStamp;
}
};
struct DESLayer {
public:
list<Event*> eventQ;
DESLayer(list<Event*>& evtQ) {
eventQ = evtQ;
}
void printEvents() {
for (Event* event : eventQ) {
int evtTimeStamp = event->evtTimeStamp;
int PID = event->evtProcess->PID;
int newState = event->newState;
cout << evtTimeStamp
<< ":"
<< PID
<< ":"
<< newState
<< " ";
}
}
void addEvent(Event& newEvent) {
if (printAddRmEvent) {
cout << " "
<< "AddEvent"
<< "("
<< newEvent.evtTimeStamp
<< ":"
<< newEvent.evtProcess->PID
<< ":"
<< newEvent.newState
<< ")"
<< ":"
<< " ";
printEvents();
cout << " ==> ";
}
if (eventQ.empty()) {
eventQ.push_front(&newEvent);
}
else if (!eventQ.empty()) {
for (list<Event*>::iterator it = eventQ.begin(); it != eventQ.end(); it++) {
if (newEvent.evtTimeStamp > (*it)->evtTimeStamp) {
if (next(it) != eventQ.end()) {
continue;
}
else if (next(it) == eventQ.end()) {
eventQ.push_back(&newEvent);
}
break;
}
else if (newEvent.evtTimeStamp == (*it)->evtTimeStamp) {
if (next(it) == eventQ.end()) {
eventQ.insert(next(it), &newEvent);
break;
}
else {
continue;
}
}
else if (newEvent.evtTimeStamp < (*it)->evtTimeStamp) {
eventQ.insert(it, &newEvent);
break;
}
}
}
if (printAddRmEvent) {
printEvents();
cout << endl;
}
}
Event* getEvent() {
Event* event = eventQ.front();
eventQ.pop_front();
return event;
}
void rmEvent(PCB* pcb) {
for (Event* event: eventQ) {
if (event->evtProcess->PID == pcb->PID) {
if (printAddRmEvent) {
cout << "RemoveEvent"
<< "("
<< event->evtProcess->PID
<< ")"
<< ": ";
printEvents();
}
eventQ.remove(event);
if (printAddRmEvent) {
cout << " ==> ";
printEvents();
cout << endl;
}
break;
}
}
}
int getNextEventTime() {
if (!eventQ.empty()) {
return eventQ.front()->evtTimeStamp;
}
else {
return -1;
}
}
};
bool isEmpty(vector<queue<PCB*>> qVec) {
bool isEmpty = true;
for (const auto& q : qVec) {
if (!q.empty()) {
isEmpty = false;
break;
}
}
return isEmpty;
};
struct Scheduler {
virtual void addProcess(PCB* pcb) = 0;
virtual PCB* getNextProcess() = 0;
virtual bool testPreempt(PCB* unblockedPCB,
PCB* runningPCB,
int currentTime) = 0;
virtual void printQueues() = 0;
};
struct FCFS: public Scheduler {
public:
deque<PCB*> runQ;
FCFS() {
deque<PCB*> runQ;
}
void addProcess(PCB* pcb) {
runQ.push_back(pcb);
};
PCB* getNextProcess() {
PCB* nextPCB = nullptr;
if (!runQ.empty()) {
nextPCB = runQ.front();
runQ.pop_front();
}
return nextPCB;
}
bool testPreempt(PCB* unblockedPCB, PCB* runningPCB, int currentTime) {
return false;
}
void printQueues() {
}
};
struct LCFS: public Scheduler {
public:
deque<PCB*> runQ;
LCFS() {
deque<PCB*> runQ;
}
void addProcess(PCB* pcb) {
runQ.push_back(pcb);
};
PCB* getNextProcess() {
PCB* nextPCB = nullptr;
if (!runQ.empty()) {
nextPCB = runQ.back();
runQ.pop_back();
}
return nextPCB;
}
bool testPreempt(PCB* unblockedPCB, PCB* runningPCB, int currentTime) {
return false;
}
void printQueues() {
}
};
struct SRTF: public Scheduler {
public:
set<PCB*> runQ;
SRTF() {
set<PCB*> runQ;
}
void addProcess(PCB* pcb) {
runQ.insert(pcb);
};
PCB* getNextProcess() {
PCB* nextPCB = nullptr;
if (!runQ.empty()) {
auto prioritize = [](const PCB* pcb1, const PCB* pcb2) {
if (pcb1->TC < pcb2->TC) {
return true;
}
else if (pcb1->TC == pcb2->TC) {
if (pcb1->stateTimeStamp < pcb2->stateTimeStamp) {
return true;
}
}
return false;
};
nextPCB = *min_element(runQ.begin(), runQ.end(), prioritize);
runQ.erase(nextPCB);
}
return nextPCB;
}
bool testPreempt(PCB* unblockedPCB, PCB* runningPCB, int currentTime) {
return false;
}
void printQueues() {
cout << "SCHED"
<< " "
<< "("
<< runQ.size()
<< ")"
<< ":"
<< " ";
for (PCB* pcb: runQ) {
cout << pcb->PID
<< ":"
<< pcb->stateTimeStamp
<< " ";
};
cout << endl;
}
};
struct RR: public Scheduler {
public:
queue<PCB*> runQ;
RR() {
queue<PCB*> runQ;
}
void addProcess(PCB* pcb) {
runQ.push(pcb);
};
PCB* getNextProcess() {
PCB* nextPCB = nullptr;
if (!runQ.empty()) {
nextPCB = runQ.front();
runQ.pop();
}
return nextPCB;
}
bool testPreempt(PCB* unblockedPCB, PCB* runningPCB, int currentTime) {
return false;
}
void printQueues() {
}
};
struct PRIO: public Scheduler {
public:
vector<queue<PCB*>> activeQVec;
vector<queue<PCB*>> expiredQVec;
PRIO() {
activeQVec = vector<queue<PCB*>>(maxPrio);
expiredQVec = vector<queue<PCB*>>(maxPrio);
}
void addProcess(PCB* pcb) {
if (pcb->dynamicPriority >= 0) {
int activeQInd = (maxPrio - 1) - pcb->dynamicPriority;
activeQVec.at(activeQInd).push(pcb);
}
else if (pcb->dynamicPriority < 0) {
pcb->dynamicPriority = pcb->staticPriority - 1;
int expiredQInd = (maxPrio - 1) - pcb->dynamicPriority;
expiredQVec.at(expiredQInd).push(pcb);
}
};
PCB* getNextProcess() {
PCB* nextPCB = nullptr;
if (isEmpty(activeQVec)) {
activeQVec.swap(expiredQVec);
if (printReadyQ) {
cout << "switched queues" << endl;
}
}
if (!isEmpty(activeQVec)) {
for (queue<PCB*>& activeQ: activeQVec) {
if (!activeQ.empty()) {
nextPCB = activeQ.front();
activeQ.pop();
break;
}
}
}
return nextPCB;
}
bool testPreempt(PCB* unblockedPCB, PCB* runningPCB, int currentTime) {
return false;
}
void printQueues() {
cout << "{ ";
for (queue<PCB*> activeQ: activeQVec) {
if (activeQ.empty()) {
cout << "["
<< ""
<< "]";
}
else {
queue<PCB*> copyQ = activeQ;
cout << "[";
while(!copyQ.empty()) {
cout << copyQ.front()->PID;
copyQ.pop();
if (!copyQ.empty()){
cout << ",";
}
}
cout << "]";
}
}
cout << "}"
<< ": "
<< "{ ";
for (queue<PCB*> expiredQ: expiredQVec) {
if (expiredQ.empty()) {
cout << "["
<< ""
<< "]";
}
else {
cout << "["
<< expiredQ.front()->PID
<< "]";
}
}
cout << "}"
<< " "
<< ":"
<< endl;
};
};
struct PREPRIO: public Scheduler {
public:
vector<queue<PCB*>> activeQVec;
vector<queue<PCB*>> expiredQVec;
PREPRIO() {
activeQVec = vector<queue<PCB*>>(maxPrio);
expiredQVec = vector<queue<PCB*>>(maxPrio);
}
void addProcess(PCB* pcb) {
if (pcb->dynamicPriority >= 0) {
int activeQInd = (maxPrio - 1) - pcb->dynamicPriority;
activeQVec.at(activeQInd).push(pcb);
}
else if (pcb->dynamicPriority < 0) {
pcb->dynamicPriority = pcb->staticPriority - 1;
int expiredQInd = (maxPrio - 1) - pcb->dynamicPriority;
expiredQVec.at(expiredQInd).push(pcb);
}
};
PCB* getNextProcess() {
PCB* nextPCB = nullptr;
if (isEmpty(activeQVec)) {
activeQVec.swap(expiredQVec);
if (printReadyQ) {
cout << "switched queues" << endl;
}
}
if (!isEmpty(activeQVec)) {
for (queue<PCB*>& activeQ: activeQVec) {
if (!activeQ.empty()) {
nextPCB = activeQ.front();
activeQ.pop();
break;
}
}
}
return nextPCB;
}
bool testPreempt(PCB* unblockedPCB, PCB* runningPCB, int currentTime) {
int cond1 = 0;
int cond2 = 0;
int runningDynamicPriority = runningPCB->dynamicPriority;
int nextEventTime = runningPCB->nextEventTime;
bool preemptRunningPCB = false;
int timeUntilNextEvent = nextEventTime - currentTime;
if (unblockedPCB->dynamicPriority > runningDynamicPriority) {
cond1 = 1;
}
if (nextEventTime > currentTime) {
cond2 = 1;
}
if (cond1 == 1 && cond2 == 1) {
preemptRunningPCB = true;
}
if (printPreemptProcess) {
cout << " "
<< "-->"
<< " "
<< "PrioPreempt"
<< " "
<< "Cond1=" << cond1
<< " "
<< "Cond2=" << cond2
<< " "
<< "("
<< timeUntilNextEvent
<< ")"
<< " --> ";
if (preemptRunningPCB == true) {
cout << "YES" << endl;
}
else if (preemptRunningPCB == false) {
cout << "NO" << endl;
}
}
return preemptRunningPCB;
}
void printQueues() {
cout << "{ ";
for (queue<PCB*> activeQ: activeQVec) {
if (activeQ.empty()) {
cout << "["
<< ""
<< "]";
}
else {
queue<PCB*> copyQ = activeQ;
cout << "[";
while(!copyQ.empty()) {
cout << copyQ.front()->PID;
copyQ.pop();
if (!copyQ.empty()){
cout << ",";
}
}
cout << "]";
}
}
cout << "}"
<< ": "
<< "{ ";
for (queue<PCB*> expiredQ: expiredQVec) {
if (expiredQ.empty()) {
cout << "["
<< ""
<< "]";
}
else {
cout << "["
<< expiredQ.front()->PID
<< "]";
}
}
cout << "}"
<< " "
<< ":"
<< endl;
};
};
void transition(PCB* pcb, int currentTime, stateEnum oldState, stateEnum newState,
vector<int> randVals, string schedulerType) {
if (oldState == RUNNG && newState == READY) {
runQueue.pop();
pcb->CPUBurst = pcb->CPUBurst - (currentTime - pcb->runStart);
pcb->TC = pcb->TC - (currentTime - pcb->runStart);
if (printTransition) {
cout << currentTime
<< " "
<< pcb->PID
<< " "
<< currentTime - pcb->runStart
<< ": "
<< getState(oldState)
<< " -> "
<< getState(newState)
<< " "
<< " "
<< "cb=" << pcb->CPUBurst
<< " "
<< "rem=" << pcb->TC
<< " "
<< "prio=" << pcb->dynamicPriority
<< endl;
}
pcb->dynamicPriority--;
if (schedulerType == "RR") {
pcb->dynamicPriority = pcb->staticPriority - 1;
}
}
else if (oldState == READY && newState == RUNNG) {
pcb->CPUWaitTime = pcb->CPUWaitTime + currentTime - pcb->stateTimeStamp;
if (pcb->TC <= pcb->CPUBurst) {
pcb->CPUBurst = pcb->TC;
}
else if (pcb->CPUBurst == 0) {
pcb->CPUBurst = assignRandom(pcb->CB, randVals);
}
if (pcb->CPUBurst > pcb->TC) {
pcb->CPUBurst = pcb->TC;
}
if (printTransition) {
cout << currentTime
<< " "
<< pcb->PID
<< " "
<< currentTime - pcb->stateTimeStamp
<< ": "
<< getState(oldState)
<< " -> "
<< getState(newState)
<< " "
<< "cb=" << pcb->CPUBurst
<< " "
<< "rem=" << pcb->TC
<< " "
<< "prio=" << pcb->dynamicPriority
<< endl;
}
}
else if (oldState == RUNNG && newState == BLOCK) {
pcb->CPUBurst = pcb->CPUBurst - (currentTime - pcb->runStart);
pcb->TC = pcb->TC - (currentTime - pcb->runStart);
runQueue.pop();
if (pcb->TC != 0) {
if (pcb->IOBurst == 0) {
pcb->IOBurst = assignRandom(pcb->IB, randVals);
}
if (printTransition) {
cout << currentTime
<< " "
<< pcb->PID
<< " "
<< currentTime - pcb->stateTimeStamp
<< ": "
<< getState(oldState)
<< " -> "
<< getState(newState)
<< " "
<< " "
<< "ib=" << pcb->IOBurst
<< " "
<< "rem=" << pcb->TC
<< endl;
}
if (currentTime > blockEnd) {
blockStart = currentTime;
blockEnd = currentTime + pcb->IOBurst;
IOBusy = IOBusy + blockEnd - blockStart;
}
else if (currentTime <= blockEnd && currentTime + pcb->IOBurst > blockEnd) {
IOBusy = IOBusy + currentTime + pcb->IOBurst - blockEnd;
blockStart = currentTime;
blockEnd = currentTime + pcb->IOBurst;
}
}
else if (pcb->TC == 0) {
if (printTransition) {
cout << currentTime
<< " "
<< pcb->PID
<< " "
<< currentTime - pcb->stateTimeStamp
<< ": "
<< getState(Done)
<< endl;
}
}
}
else if (oldState == BLOCK && newState == READY) {
if (printTransition) {
cout << currentTime
<< " "
<< pcb->PID
<< " "
<< currentTime - pcb->stateTimeStamp
<< ": "
<< getState(oldState)
<< " -> "
<< getState(newState)
<< endl;
}
pcb->IOTime = pcb->IOTime + currentTime - pcb->stateTimeStamp;
pcb->dynamicPriority = pcb->staticPriority - 1;
pcb->IOBurst = 0;
}
else if (newState != Done) {
if (printTransition) {
cout << currentTime
<< " "
<< pcb->PID
<< " "
<< currentTime - pcb->stateTimeStamp
<< ": "
<< getState(oldState)
<< " -> "
<< getState(newState)
<< endl;
}
}
};
int main(int argc, char* argv[]) {
for (int i = 0; i < argc; i++) {
string userOption = argv[i];
if (userOption == "-v") {
printTransition = true;
continue;
}
else if (userOption == "-t") {
printReadyQ = true;
continue;
}
else if (userOption == "-e") {
printAddRmEvent = true;
continue;
}
else if (userOption == "-p") {
printPreemptProcess = true;
continue;
}
else if (userOption == "-s") {
continue;
}
else if (userOption.substr(0, 2) == "-s") {
size_t sPos = userOption.find("-s");
userOption.erase(sPos, 2);
}
if (userOption[0] == 'F') {
schedulerType = "FCFS";
continue;
}
else if (userOption[0] == 'L') {
schedulerType = "LCFS";
continue;
}
else if (userOption[0] == 'S') {
schedulerType = "SRTF";
continue;
}
else if (userOption[0] == 'R') {
schedulerType = "RR";
size_t RPos = userOption.find('R');
userOption.erase(RPos, 1);
if (!userOption.empty()) {
timeQuantum = stoi(userOption);
}
continue;
}
else if (userOption[0] == 'P' || userOption[0] == 'E') {
if (userOption[0] == 'P'){
schedulerType = "PRIO";
size_t PPos = userOption.find('P');
userOption.erase(PPos, 1);
}
else if (userOption[0] == 'E') {
schedulerType = "PREPRIO";
size_t EPos = userOption.find('E');
userOption.erase(EPos, 1);
}
if (!userOption.empty()) {
size_t colonPos = userOption.find(':');
if (colonPos == string::npos) {
timeQuantum = stoi(userOption);
}
else if (colonPos != string::npos) {
timeQuantum = stoi(userOption.substr(0, colonPos));
maxPrio = stoi(userOption.substr(colonPos + 1));
}
}
continue;
}
if (i+2 == argc) {
inputFilePath = userOption;
continue;
}
if (i+1 == argc) {
rfilePath = userOption;
break;
}
}
vector<int> randVals = readRandom(rfilePath);
queue<PCB*> readyQueue;
Scheduler* scheduler;
if (schedulerType == "FCFS") {
scheduler = new FCFS();
timeQuantum = 10000;
}
else if (schedulerType == "LCFS") {
scheduler = new LCFS();
timeQuantum = 10000;
}
else if (schedulerType == "SRTF") {
scheduler = new SRTF();
timeQuantum = 10000;
}
else if (schedulerType == "RR") {
scheduler = new RR();
}
else if (schedulerType == "PRIO") {
scheduler = new PRIO();
}
else if (schedulerType == "PREPRIO") {
scheduler = new PREPRIO();
}
list<Event*> eventQ;
DESLayer DES(eventQ);
Event* evt;
bool callScheduler = false;
double totalSimTime;
int processNum = 0;
ifstream inputFile(inputFilePath);
string line;
queue<PCB*> processQ;
while (getline(inputFile, line)) {
vector<int> PCBInputs;
PCBInputs.push_back(processNum);
int prio = assignRandom(maxPrio, randVals);
char * lineChar = new char[line.length() + 1];
strcpy(lineChar, line.c_str());
char * token = strtok(lineChar, " \t");
while (token != NULL) {
PCBInputs.push_back(stoi(token));
token = strtok(NULL, " \t");
continue;
}