Task_11.cpp

#include <iostream>
#include "mpi.h"
int main(int argc, char **argv)
{
	int rank, size, prev, next;
	int buf[2];
	
	MPI_Init(&argc, &argv);
	
	MPI_Request reqs[4];
	MPI_Status stats[4];
	
	MPI_Comm_size(MPI_COMM_WORLD, &size);
	MPI_Comm_rank(MPI_COMM_WORLD, &rank);
	
	prev = rank - 1;
	next = rank + 1;
	
	if (rank == 0) prev = size - 1;
	if (rank == size - 1) next = 0;
	
	MPI_Sendrecv(&rank, 1, MPI_INT, next, 5, &buf[0], 1, MPI_INT, prev, 5, MPI_COMM_WORLD, &stats[0]);
	MPI_Sendrecv(&rank, 1, MPI_INT, prev, 6, &buf[1], 1, MPI_INT, next, 6, MPI_COMM_WORLD, &stats[1]);
		
	printf("Current process : %d\nIt recieved %d from the prev process %d\nIt recieved %d from the next process %d\n\n", rank, buf[0], prev, buf[1], next);
		
	MPI_Finalize();
}