Matrix addition using multithreading.

pthread_matrix_add.c

#include <stdio.h>
#include <pthread.h>

#define T 2
#define N 4

int A[N][N] = {{1,0,1,0},{0,1,1,0},{1,0,1,0},{0,1,1,0}};
int B[N][N] = {{0,2,2,0},{2,0,2,0},{0,2,2,0},{2,0,2,0}};
int C[N][N] = {{0}};

void *matrix_add(void *arg) {
	int id = *(int*)arg;
	int i, j;

	for (i = id; i < N; i += T)
		for (j = 0; j < N; j++)
			C[i][j] = A[i][j] + B[i][j];

	pthread_exit(NULL);
}

int main()
{
        pthread_t thread[T];
        int tid[T];
	int i, j;

	for (i = 0; i < T; i++) {
		tid[i] = i;
		pthread_create(&thread[i], NULL, matrix_add, &tid[i]);
	}

	for (i = 0; i < T; i++)
		pthread_join(thread[i], NULL);

	for (i = 0; i < N; i++)
		for (j = 0; j < N; j++)
			printf((j < N-1) ? "%d " : "%d\n", C[i][j]);

	return 0;
}

Design and implement a program to add two m x n matrices (n>=100 and m>=100). In order to perform the above, two versions of the program need to be implemented, one, a sequential version and the other a concurrent version. The sequential version implements a function to add the two matrices. The concurrent version of the program spawns threads, each thread to add the assigned number of rows. The main thread computes the consolidated output matrix.
Perform the following using file management system calls:
2.1 Design and implement the application using sequential approach with functions
2.2 Design and implement the application using multi threaded approach

sir how to solve it