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


int main(int argc, char **argv)
{
    int rank;
    double t1,t2;
    int i, doit,doit2, iter;
    double x;


    MPI_Init(&argc, &argv);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);

    i = 1;
    x = 0;
    iter = 0;
    doit = 0;

    t1 = MPI_Wtime();

    while(i>0)
    {
        // all processes are synced at the same iteration
        MPI_Barrier(MPI_COMM_WORLD);

        // process 0 checks time
        if (rank == 0)
        {
            t2 = MPI_Wtime();
            if (t2-t1 >= 2.)
            {
                doit = 1;
            }
        }

        // broadcast the flag, this also sync processes
        MPI_Bcast(&doit, 1, MPI_INT, 0, MPI_COMM_WORLD);

        // all processes are synced so if doit==1
        // we write the file
        if (doit ==1)
        {
        printf("I am processor %d and x = %f\n", rank, x);
        MPI_Barrier(MPI_COMM_WORLD);
        break;
        }
        i++;
        x+=0.0001;
    };

    printf("%d, %d ,%f\n", rank, i, x);

    MPI_Finalize();

    return 0;
}