barrier.c

#include <mpi.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char* argv[]){
    MPI_Init(&argc, &argv);
    int size, rank;
    MPI_Comm_size(MPI_COMM_WORLD, &size);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
    int data;
    if(rank == 0){
        // We the monitor process
        for(int i=1; i < size; ++i){
            data = rand();
            // Sending out data
            MPI_Send(&data, 1, MPI_INT, i, 0, MPI_COMM_WORLD);
        }
        MPI_Barrier(MPI_COMM_WORLD);
    }else{
        MPI_Recv(&data, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);
        printf("Process %d received numbr %d\n", rank, data);
        MPI_Barrier(MPI_COMM_WORLD);
    }
    MPI_Finalize();
    return 0;
}