large matrices working

04-MatrixAddition (pthread)/matAddThread2.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+#define NUM_THREADS 4
+
+int *matrix1;
+int *matrix2;
+int *result;
+int num_rows;
+int num_cols;
+
+void *matrix_addition(void *arg) {
+    int thread_id = *(int *)arg;
+    int i, j;
+    for (i = thread_id; i < num_rows; i += NUM_THREADS) {
+        for (j = 0; j < num_cols; j++) {
+            int index = i * num_cols + j;
+            result[index] = matrix1[index] + matrix2[index];
+        }
+    }
+    pthread_exit(NULL);
+}
+
+int main() {
+    int i, j;
+    num_rows = 3;
+    num_cols = 3;
+
+    // Allocate memory for matrices
+    matrix1 = malloc(num_rows * num_cols * sizeof(int));
+    matrix2 = malloc(num_rows * num_cols * sizeof(int));
+    result = malloc(num_rows * num_cols * sizeof(int));
+
+    // Initialize matrices
+    for (i = 0; i < num_rows; i++) {
+        for (j = 0; j < num_cols; j++) {
+            int index = i * num_cols + j;
+            matrix1[index] = rand() % 10;
+            matrix2[index] = rand() % 10;
+        }
+    }
+
+    // Create threads
+    pthread_t threads[NUM_THREADS];
+    int thread_ids[NUM_THREADS];
+    for (i = 0; i < NUM_THREADS; i++) {
+        thread_ids[i] = i;
+        pthread_create(&threads[i], NULL, matrix_addition, &thread_ids[i]);
+    }
+
+    // Join threads
+    for (i = 0; i < NUM_THREADS; i++) {
+        pthread_join(threads[i], NULL);
+    }
+
+    // Print result matrix
+    printf("Result matrix:\n");
+    for (i = 0; i < num_rows; i++) {
+        for (j = 0; j < num_cols; j++) {
+            printf("%d ", result[i * num_cols + j]);
+        }
+        printf("\n");
+    }
+
+    // Free memory
+    free(matrix1);
+    free(matrix2);
+    free(result);
+
+    return 0;
+}