Simulator/multiple_instance.html at main · anuhyamurki/Simulator · GitHub

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<!DOCTYPE html>
<html>

<head>
    <title>Deadlock Detection for Multiple Instance Resources</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 20px;
            background-color: #f1f1f1;
            background-image: url("images/bg.jpg");
        }

        .container {
            max-width: 600px;
            margin: 0 auto;
            background-color: #fff;
            border: 1px solid #ccc;
            border-radius: 5px;
            padding: 20px;
            text-align: center;
        }

        h1 {
            margin-top: 0;
            text-align: center;
        }

        form {
            margin-bottom: 20px;
        }

        label {
            display: block;
            font-weight: bold;
            margin-bottom: 5px;
        }

        table {
            width: 100%;
            margin-bottom: 10px;
            border-collapse: collapse;
            display: inline-block;
            text-align: left;
        }

        table th,
        table td {
            padding: 8px;
            text-align: left;
            border-bottom: 1px solid #ddd;
        }

        table th {
            background-color: #f2f2f2;
        }

        .btn {
            padding: 8px 16px;
            background-color: #4CAF50;
            color: #fff;
            border: none;
            border-radius: 3px;
            cursor: pointer;
        }

        .result {
            margin-top: 20px;
            padding: 10px;
            background-color: #fff;
            text-align: center;
        }
    </style>
</head>

<body>
    <div class="container">
        <h1>Deadlock Detection for Multiple Instance Resources</h1>

        <form id="deadlockForm">
            <label for="numResources">Number of Resources:</label>
            <input type="number" id="numResources" required><br>

            <label for="numProcesses">Number of Processes:</label>
            <input type="number" id="numProcesses" required><br>

            <h2>Allocation Matrix</h2>
            <table id="allocationMatrix"></table>

            <h2>Request Matrix</h2>
            <table id="requestMatrix"></table>

            <button type="button" class="btn" onclick="detectDeadlock()">Detect Deadlock</button>
        </form>

        <div id="result" class="result"></div>

        <script>
            // Generate input fields for allocation and request matrices based on the user's input
            function generateInputFields() {
                var numResources = parseInt(document.getElementById("numResources").value);
                var numProcesses = parseInt(document.getElementById("numProcesses").value);

                var allocationMatrix = document.getElementById("allocationMatrix");
                allocationMatrix.innerHTML = generateMatrixHTML(numProcesses, numResources, "allocation");

                var requestMatrix = document.getElementById("requestMatrix");
                requestMatrix.innerHTML = generateMatrixHTML(numProcesses, numResources, "request");
            }

            // Generate HTML code for the allocation and request matrices
            function generateMatrixHTML(numRows, numCols, matrixType) {
                var matrixHTML = "<tr><th></th>";

                for (var j = 0; j < numCols; j++) {
                    matrixHTML += "<th>R" + j + "</th>";
                }

                matrixHTML += "</tr>";

                for (var i = 0; i < numRows; i++) {
                    matrixHTML += "<tr><th>P" + i + "</th>";

                    for (var j = 0; j < numCols; j++) {
                        matrixHTML += "<td><input type='number' id='" + matrixType + "-" + i + "-" + j + "' required></td>";
                    }

                    matrixHTML += "</tr>";
                }

                return matrixHTML;
            }

            // Function to detect deadlock in the resource allocation graph
            function detectDeadlock() {
                var numResources = parseInt(document.getElementById("numResources").value);
                var numProcesses = parseInt(document.getElementById("numProcesses").value);

                var allocation = [];
                var request = [];

                // Read values from the allocation and request matrices
                for (var i = 0; i < numProcesses; i++) {
                    var allocationRow = [];
                    var requestRow = [];

                    for (var j = 0; j < numResources; j++) {
                        var allocationValue = parseInt(document.getElementById("allocation-" + i + "-" + j).value);
                        var requestValue = parseInt(document.getElementById("request-" + i + "-" + j).value);

                        allocationRow.push(allocationValue);
                        requestRow.push(requestValue);
                    }

                    allocation.push(allocationRow);
                    request.push(requestRow);
                }

                var deadlock = detectDeadlockHelper(numResources, numProcesses, allocation, request);

                var resultElement = document.getElementById("result");
                resultElement.innerHTML = deadlock ? "Deadlock detected!" : "No deadlock detected.";
            }

            // Function to check if a cycle exists in the wait-for graph
            function isCycle(process, visited, recursionStack, n, wfg) {
                if (visited[process] === false) {
                    visited[process] = true;
                    recursionStack[process] = true;

                    for (var i = 0; i < n; i++) {
                        if (wfg[process][i]) {
                            if (!visited[i] && isCycle(i, visited, recursionStack, n, wfg))
                                return true;
                            else if (recursionStack[i])
                                return true;
                        }
                    }
                }

                recursionStack[process] = false;
                return false;
            }

            // Function to detect deadlock in the resource allocation graph
            function detectDeadlockHelper(m, n, allocation, request) {
                var wfg = [];
                var visited = [];
                var recursionStack = [];

                // Create wait-for graph (WFG) based on resource allocation and request matrices
                for (var i = 0; i < n; i++) {
                    wfg.push(new Array(n).fill(false));
                    visited.push(false);
                    recursionStack.push(false);

                    for (var j = 0; j < m; j++) {
                        if (request[i][j] > 0) {
                            // Process i is waiting for resource j
                            for (var k = 0; k < n; k++) {
                                if (allocation[k][j] > 0) {
                                    // Resource j is allocated to process k
                                    wfg[i][k] = true;
                                }
                            }
                        }
                    }
                }

                // Check for cycles in the wait-for graph (WFG)
                for (var i = 0; i < n; i++) {
                    if (isCycle(i, visited, recursionStack, n, wfg))
                        return true;
                }

                return false;
            }

            document.getElementById("deadlockForm").addEventListener("submit", function (event) {
                event.preventDefault();
            });

            // Call generateInputFields function when the number of resources and processes are entered
            document.getElementById("numResources").addEventListener("change", generateInputFields);
            document.getElementById("numProcesses").addEventListener("change", generateInputFields);
        </script>
    </div>
</body>

</html>