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script.js
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script.js
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//document.addEventListener('DOMContentLoaded', function() {
function addProcessFields()
{
const processCount = parseInt(document.getElementById('process-count').value);
const processFieldsDiv = document.getElementById('process-fields');
processFieldsDiv.innerHTML = '';
for (let i = 1; i <= processCount; i++)
{
const processDiv = document.createElement('div');
const arrivalLabel = `<label for="arrival-time-${i}"><b>PROCESS ${i}</b> </label>`;
const inputs = `
<label for="arrival-time-${i}"> Arrival Time:</label>
<input type="number" id="arrival-time-${i}" class="arrival-time">
<label for="burst-time-${i}">Burst Time:</label>
<input type="number" id="burst-time-${i}" class="burst-time">
<br>
<label for="priority-${i}">Priority:</label>
<input type="number" id="priority-${i}" class="priority">
`;
processDiv.innerHTML = arrivalLabel + inputs;
processFieldsDiv.appendChild(processDiv);
}
}
function toggleTQ()
{
const algorithm = document.getElementById('algorithm').value;
const TQInput = document.getElementById('time-quantum');
if (algorithm === 'rr')
{
TQInput.disabled = false;
}
else
{
TQInput.disabled = true;
}
}
function runAlgorithm()
{
const algorithm = document.getElementById('algorithm').value;
let resultClass = '';
switch (algorithm)
{
case 'fcfs':
resultClass = 'result-fcfs';
runFCFS(); //calling fcfs
break;
case 'sjf':
resultClass = 'result-sjf';
runSJF();//call sjf
break;
case 'rr':
resultClass = 'result-rr';
const TQ = parseInt(document.getElementById('time-quantum').value);
runRR(TQ); //passing TQ
break;
case 'srtf':
resultClass = 'result-srtf';
runSRTF(); // Call the SRTF function
break;
case 'priority':
resultClass = 'result-priority';
runPriority(); //call prior
break;
}
document.getElementById('result').className = resultClass;
}
//------------------------------FUNCTIONSS-------------------
//-------------1. FCFS--------------
function runFCFS()
{
const arrivalTimes = document.querySelectorAll('.arrival-time');
const burstTimes = document.querySelectorAll('.burst-time');
let contextSwitch=0;
let c = parseInt(document.getElementById('context').value); // Retrieve context switch value
if( c !== 0)
{
contextSwitch=c;
}
// INITIALISE VARIABLESS
let totaltime = 0;
let waitng = 0;
let tatime = 0;
let executionorder = [];
// Create an array to hold objects representing processes
const processes = [];
for (let i = 0; i < arrivalTimes.length; i++)
{
processes.push({
arrivalTime: parseInt(arrivalTimes[i].value),
burstTime: parseInt(burstTimes[i].value),
process: i + 1
});
}
// Sort processes based on their arrival times
processes.sort((a, b) => a.arrivalTime - b.arrivalTime);
// Execute processes in FCFS order
for (const process of processes)
{
const completionTime = Math.max(process.arrivalTime, totaltime) + process.burstTime + contextSwitch;
const waiting = Math.max(0, totaltime - process.arrivalTime);
waitng += waiting;
tatime += completionTime - process.arrivalTime;
totaltime = completionTime;
executionorder.push({ process: process.process, waiting });
}
// Call the FCFS-specific Gantt chart generation function
const avgWT = waitng / arrivalTimes.length;
const avgTAT = tatime / arrivalTimes.length;
displayResults(executionorder, avgWT, avgTAT);
}
//-------------2. SJF--------------
function runSJF()
{
const arrivalTimes = document.querySelectorAll('.arrival-time');
const burstTimes = document.querySelectorAll('.burst-time');
let contextSwitch=0;
let c = parseInt(document.getElementById('context').value); // Retrieve context switch value
if( c !== 0)
{
contextSwitch=c;
}
let totaltime = 0;
let waitng = 0;
let tatime = 0;
let executionorder = [];
// Convert to array and sort processes by burst time
const processes = Array.from(burstTimes).map((b, index) => ({
process: index + 1,
arrivalTime: parseInt(arrivalTimes[index].value),
burstTime: parseInt(b.value)
})).sort((a, b) => a.burstTime - b.burstTime || a.arrivalTime - b.arrivalTime);
for (const process of processes)
{
const completionTime = Math.max(process.arrivalTime, totaltime) + process.burstTime+contextSwitch;
const waiting = Math.max(0, totaltime - process.arrivalTime);
waitng += waiting;
tatime += completionTime - process.arrivalTime;
totaltime = completionTime;
executionorder.push({ process: process.process, waiting });
}
const avgWT = waitng / processes.length;
const avgTAT = tatime / processes.length;
displayResults(executionorder, avgWT, avgTAT);
}
//-------------3. RR--------------
function runRR(TQ)
{
const arrivalTimes = document.querySelectorAll('.arrival-time');
const burstTimes = document.querySelectorAll('.burst-time');
let contextSwitch=0;
let c = parseInt(document.getElementById('context').value); // Retrieve context switch value
if( c !== 0)
{
contextSwitch=c;
}
let totaltime = 0;
let waitng = 0;
let tatime = 0;
let executionorder = [];
const processes = Array.from(burstTimes).map((b, index) => ({
process: index + 1,
arrivalTime: parseInt(arrivalTimes[index].value),
burstTime: parseInt(b.value),
remainingBurstTime: parseInt(b.value)
}));
while (processes.some(process => process.remainingBurstTime > 0))
{
for (const process of processes)
{
if (process.remainingBurstTime === 0) continue;
const quantum = Math.min(TQ, process.remainingBurstTime);
const completionTime = Math.min(process.arrivalTime + totaltime + quantum, totaltime + process.remainingBurstTime)+contextSwitch;
const waiting = Math.max(0, totaltime - process.arrivalTime);
waitng += waiting;
tatime += completionTime - process.arrivalTime;
totaltime = completionTime;
executionorder.push({ process: process.process, waiting });
process.remainingBurstTime -= quantum;
}
}
const avgWT = waitng / processes.length;
const avgTAT = tatime / processes.length;
displayResults(executionorder, avgWT, avgTAT);
}
//-------------4. SRTF--------------
function runSRTF()
{
const arrivalTimes = document.querySelectorAll('.arrival-time');
const burstTimes = document.querySelectorAll('.burst-time');
let contextSwitch=0;
let c = parseInt(document.getElementById('context').value); // Retrieve context switch value
if( c !== 0)
{
contextSwitch=c;
}
let totaltime = 0;
let waitng = 0;
let tatime = 0;
let executionorder = [];
// Convert to array and sort processes by remaining burst time
const processes = Array.from(burstTimes).map((burstTime, index) => ({
process: index + 1,
arrivalTime: parseInt(arrivalTimes[index].value),
burstTime: parseInt(burstTime.value),
remainingBurstTime: parseInt(burstTime.value)
})).sort((a, b) => a.remainingBurstTime - b.remainingBurstTime || a.arrivalTime - b.arrivalTime);
while (processes.some(process => process.remainingBurstTime > 0)) {
let shortestProcessIndex = -1;
let shortestBurstTime = Infinity;
for (let i = 0; i < processes.length; i++)
{
if (processes[i].arrivalTime <= totaltime && processes[i].remainingBurstTime < shortestBurstTime && processes[i].remainingBurstTime > 0)
{
shortestBurstTime = processes[i].remainingBurstTime;
shortestProcessIndex = i;
}
}
if (shortestProcessIndex === -1)
{
totaltime++;
continue;
}
const process = processes[shortestProcessIndex];
const completionTime = totaltime + contextSwitch+ 1;
const waiting = totaltime - process.arrivalTime;
waitng += waiting;
tatime += completionTime - process.arrivalTime;
totaltime = completionTime;
executionorder.push({ process: process.process, waiting });
process.remainingBurstTime--;
if (process.remainingBurstTime === 0)
{
// Remove completed process from the array
processes.splice(shortestProcessIndex, 1);
}
}
const avgWT = waitng / (arrivalTimes.length - processes.length);
const avgTAT = tatime / (arrivalTimes.length - processes.length);
displayResults(executionorder, avgWT, avgTAT);
}
//-------------5. PRIORIRTY--------------
function runPriority()
{
const arrivalTimes = document.querySelectorAll('.arrival-time');
const burstTimes = document.querySelectorAll('.burst-time');
const priorities = document.querySelectorAll('.priority');
let contextSwitch=0;
let c = parseInt(document.getElementById('context').value); // Retrieve context switch value
if( c !== 0)
{
contextSwitch=c;
}
let totaltime = 0;
let waitng = 0;
let tatime = 0;
let executionorder = [];
// Convert to array and sort processes by priority
const processes = Array.from(burstTimes).map((burstTime, index) => ({
process: index + 1,
arrivalTime: parseInt(arrivalTimes[index].value),
burstTime: parseInt(burstTime.value),
priority: parseInt(priorities[index].value)
})).sort((a, b) => a.priority - b.priority || a.arrivalTime - b.arrivalTime);
for (const process of processes)
{
const completionTime = Math.max(process.arrivalTime, totaltime) + process.burstTime+contextSwitch;
const waiting = Math.max(0, totaltime - process.arrivalTime);
waitng += waiting;
tatime += completionTime - process.arrivalTime;
totaltime = completionTime;
executionorder.push({ process: process.process, waiting });
}
const avgWT = waitng / processes.length;
const avgTAT = tatime / processes.length;
displayResults(executionorder, avgWT, avgTAT);
}
//------------------END OF ALGOOOSSSSS-------------------------
//----------------GANTT-----------------
function toggleGantt()
{
const ganttChart = document.getElementById('gantt-chart');
const checkbox = document.getElementById('show-gantt-checkbox');
if (checkbox.checked)
{
ganttChart.style.display = 'block';
}
else
{
ganttChart.style.display = 'none';
}
}
//*************** FCFS - GANTT ******************
function GanttFCFS(executionorder, arrivalTimes, burstTimes)
{
const ganttChartDiv = document.getElementById('gantt-chart');
let totaltime = 0;
let contextSwitch=0;
let c = parseInt(document.getElementById('context').value); // Retrieve context switch value
if( c !== 0)
{
contextSwitch=c;
}
let ganttChartHTML = `
<table>
<tr>
`;
for (let i = 0; i < executionorder.length; i++)
{
const processNumber = executionorder[i].process;
const arrivalTime = parseInt(arrivalTimes[processNumber - 1].value);
const burstTime = parseInt(burstTimes[processNumber - 1].value);
const startTime = Math.max(totaltime, arrivalTime);
const endTime = startTime + burstTime;
totaltime = endTime;
ganttChartHTML += `
<th colspan=2>Process ${processNumber}</th>
<th colspan=2 class="cpu">CPU Switch</th>
`;
totaltime += contextSwitch; // Add context switch time after each process
}
ganttChartHTML += `</tr><tr>`;
totaltime = 0;
for (let i = 0; i < executionorder.length; i++)
{
const processNumber = executionorder[i].process;
const arrivalTime = parseInt(arrivalTimes[processNumber - 1].value);
const burstTime = parseInt(burstTimes[processNumber - 1].value);
const startTime = Math.max(totaltime, arrivalTime);
const endTime = startTime + burstTime;
totaltime = endTime;
// Duration for the process
const processDuration = burstTime;
ganttChartHTML += `
<td>${startTime}</td>
<td>${endTime}</td>
<td colspan=2>${contextSwitch}</td>
`;
totaltime += contextSwitch;
}
ganttChartHTML += `</tr></table>`;
ganttChartDiv.innerHTML = ganttChartHTML;
}
//*************** SJF - GANTT******************
function GanttSJF(executionorder, arrivalTimes, burstTimes)
{
const ganttChartDiv = document.getElementById('gantt-chart');
let totaltime = 0;
let contextSwitch=0;
let c = parseInt(document.getElementById('context').value); // Retrieve context switch value
if( c !== 0)
{
contextSwitch=c;
}
let ganttChartHTML = `
<table>
<tr>
`;
// Sort processes by burst time
const sortedProcesses = executionorder.slice().sort((a, b) => {
return parseInt(burstTimes[a.process - 1].value) - parseInt(burstTimes[b.process - 1].value);
});
for (let i = 0; i < sortedProcesses.length; i++)
{
const processNumber = sortedProcesses[i].process;
const arrivalTime = parseInt(arrivalTimes[processNumber - 1].value);
const burstTime = parseInt(burstTimes[processNumber - 1].value);
const startTime = Math.max(totaltime, arrivalTime);
const endTime = startTime + burstTime;
totaltime = endTime;
ganttChartHTML += `
<th colspan=2>Process ${processNumber}</th>
<th colspan=2 class="cpu">CPU Switch</th>
`;
totaltime += contextSwitch; // Add context switch time after each process
}
ganttChartHTML += `</tr><tr>`;
totaltime = 0;
for (let i = 0; i < sortedProcesses.length; i++)
{
const processNumber = sortedProcesses[i].process;
const arrivalTime = parseInt(arrivalTimes[processNumber - 1].value);
const burstTime = parseInt(burstTimes[processNumber - 1].value);
const startTime = Math.max(totaltime, arrivalTime);
const endTime = startTime + burstTime;
totaltime = endTime;
ganttChartHTML += `
<td>${startTime}</td>
<td>${endTime}</td>
<td colspan=2>${contextSwitch}</td>
`;
totaltime += contextSwitch; // Add context switch time after each process
}
ganttChartHTML += `</tr></table>`;
ganttChartDiv.innerHTML = ganttChartHTML;
}
//*************** SRTF - GANTT******************
function GanttSRTF(executionorder, arrivalTimes, burstTimes)
{
const ganttChartDiv = document.getElementById('gantt-chart');
let totaltime = 0;
let contextSwitch=0;
let c = parseInt(document.getElementById('context').value); // Retrieve context switch value
if( c !== 0)
{
contextSwitch=c;
}
let ganttChartHTML = `
<table>
<tr>
`;
// Sort processes by arrival time and burst time (SRTF)
const sortedProcesses = executionorder.slice().sort((a, b) => {
const arrivalDiff = arrivalTimes[a.process - 1].value - arrivalTimes[b.process - 1].value;
if (arrivalDiff === 0)
{
return burstTimes[a.process - 1].value - burstTimes[b.process - 1].value;
}
return arrivalDiff;
});
for (let i = 0; i < sortedProcesses.length; i++)
{
const processNumber = sortedProcesses[i].process;
const arrivalTime = parseInt(arrivalTimes[processNumber - 1].value);
const burstTime = parseInt(burstTimes[processNumber - 1].value);
const startTime = Math.max(totaltime, arrivalTime);
const endTime = startTime + burstTime;
totaltime = endTime;
ganttChartHTML += `
<th colspan=2>Process ${processNumber}</th>
<th colspan=2 class="cpu">CPU Switch</th>
`;
totaltime += contextSwitch; // Add context switch time after each process
}
ganttChartHTML += `</tr><tr>`;
totaltime = 0;
for (let i = 0; i < sortedProcesses.length; i++)
{
const processNumber = sortedProcesses[i].process;
const arrivalTime = parseInt(arrivalTimes[processNumber - 1].value);
const burstTime = parseInt(burstTimes[processNumber - 1].value);
const startTime = Math.max(totaltime, arrivalTime);
const endTime = startTime + burstTime;
totaltime = endTime;
ganttChartHTML += `
<td>${startTime}</td>
<td>${endTime}</td>
<td colspan=2>${contextSwitch}</td>
`;
totaltime += contextSwitch; // Add context switch time after each process
}
ganttChartHTML += `</tr></table>`;
ganttChartDiv.innerHTML = ganttChartHTML;
}
//*************** RR - GANTT******************
function GanttRR(executionorder, arrivalTimes, burstTimes, quantum)
{
let totaltime = 0;
let contextSwitch=0;
let c = parseInt(document.getElementById('context').value); // Retrieve context switch value
if( c !== 0)
{
contextSwitch=c;
}
let remainingBT = [];
let completedProcesses = [];
// Initialize remaining burst times
for (let i = 0; i < burstTimes.length; i++)
{
remainingBT.push(parseInt(burstTimes[i].value));
}
let currTime = 0;
let currentProcess = 0;
let timeSlice = quantum;
let ganttChartHTML = `
<table>
<tr>
<th>Process</th>
`;
// Add headers for each process
for (let i = 0; i < executionorder.length; i++)
{
ganttChartHTML += `
<th colspan="2">Process ${executionorder[i].process}</th>
<th colspan="2" class="cpu">CPU Switch</th>
`;
totaltime += contextSwitch; // Add context switch time after each process
}
ganttChartHTML += `</tr><tr>`;
while (completedProcesses.length < executionorder.length)
{
if (remainingBT[currentProcess] <= timeSlice && remainingBT[currentProcess] > 0) {
totaltime = currTime + remainingBT[currentProcess];
currTime = totaltime;
remainingBT[currentProcess] = 0;
completedProcesses.push(executionorder[currentProcess]);
} else if (remainingBT[currentProcess] > 0) {
totaltime = currTime + timeSlice;
currTime = totaltime;
remainingBT[currentProcess] -= timeSlice;
}
// Add start and end time for the current process
ganttChartHTML += `
<td>${currTime - remainingBT[currentProcess]}</td>
<td>${currTime}</td>
<td colspan="2">${contextSwitch}</td>
`;
totaltime += contextSwitch; // Add context switch time after each process
let nextProcess = (currentProcess + 1) % executionorder.length;
while (nextProcess !== currentProcess && remainingBT[nextProcess] === 0) {
nextProcess = (nextProcess + 1) % executionorder.length;
}
currentProcess = nextProcess;
}
ganttChartHTML += `</tr></table>`;
// Return the Gantt chart HTML
return ganttChartHTML;
}
//*************** Priority - GANTT******************
function GanttPriority(executionorder, arrivalTimes, burstTimes)
{
const ganttChartDiv = document.getElementById('gantt-chart');
let totaltime = 0;
let contextSwitch=0;
let c = parseInt(document.getElementById('context').value); // Retrieve context switch value
if( c !== 0)
{
contextSwitch=c;
}
let ganttChartHTML = `
<table>
<tr>
`;
for (let i = 0; i < executionorder.length; i++)
{
const processNumber = executionorder[i].process;
const arrivalTime = parseInt(arrivalTimes[processNumber - 1].value);
const burstTime = parseInt(burstTimes[processNumber - 1].value);
const startTime = Math.max(totaltime, arrivalTime);
const endTime = startTime + burstTime;
totaltime = endTime;
// Add the process and CPU switch columns horizontally
ganttChartHTML += `
<th colspan=2>Process ${processNumber}</th>
<th colspan=2 class="cpu">CPU Switch</th>
`;
totaltime += contextSwitch; // Add context switch time after each process
}
ganttChartHTML += `</tr><tr>`;
totaltime = 0;
for (let i = 0; i < executionorder.length; i++)
{
const processNumber = executionorder[i].process;
const arrivalTime = parseInt(arrivalTimes[processNumber - 1].value);
const burstTime = parseInt(burstTimes[processNumber - 1].value);
const startTime = Math.max(totaltime, arrivalTime);
const endTime = startTime + burstTime;
totaltime = endTime;
// Print the start time, end time, and CPU switch
ganttChartHTML += `
<td>${startTime}</td>
<td>${endTime}</td>
<td colspan=2>${contextSwitch}</td>
`;
totaltime += contextSwitch; // Add context switch time after each process
}
ganttChartHTML += `</tr></table>`;
ganttChartDiv.innerHTML = ganttChartHTML;
}
//-----------------DISPLAY---------------
function displayResults(executionorder, avgWT, avgTAT)
{
const resultDiv = document.getElementById('result');
resultDiv.innerHTML = `
<div class="step">Execution Order:</div>
<div class="execution-order">
${executionorder.map((i, index) => `<div>Step ${index + 1}: Process ${i.process} (Waiting Time: ${i.waiting})</div><br>`).join('')}
</div>
<div class="average-times">
<div>Average Waiting Time: ${avgWT.toFixed(2)}</div>
<div>Average Turnaround Time: ${avgTAT.toFixed(2)}</div>
</div>
`;
// Generate and display Gantt chart
const algorithm = document.getElementById('algorithm').value;
// Retrieve the values of arrivalTimes and burstTimes
const arrivalTimes = document.querySelectorAll('.arrival-time');
const burstTimes = document.querySelectorAll('.burst-time');
switch (algorithm)
{
case 'fcfs':
GanttFCFS(executionorder, arrivalTimes, burstTimes);
break;
case 'sjf':
GanttSJF(executionorder, arrivalTimes, burstTimes);
break;
case 'rr':
const TQ = parseInt(document.getElementById('time-quantum').value);
GanttRR(executionorder, arrivalTimes, burstTimes, TQ);
break;
case 'srtf':
GanttSRTF(executionorder, arrivalTimes, burstTimes);
break;
case 'priority':
GanttPriority(executionorder, arrivalTimes, burstTimes);
break;
}
}
//});