#include "mpi.h"
#include <stdio.h>
#include <string.h>

#define SIZE 1000

int main(int argc, char *argv[]){
    double startwtime, endwtime;
    int namelen, numprocs, myid, size ;
    char processor_name[MPI_MAX_PROCESSOR_NAME], buff[SIZE], msg[SIZE];

    MPI_Init(&argc,&argv);
    startwtime = MPI_Wtime();
    MPI_Comm_size(MPI_COMM_WORLD,&numprocs);
    MPI_Comm_rank(MPI_COMM_WORLD,&myid);
    MPI_Get_processor_name(processor_name,&namelen);
    fprintf(stderr,"\nProcessus %d sur la machine %s parmi %d processus.\n",myid,processor_name, numprocs);

    if (numprocs != 3)
        fprintf(stderr,"Il me faut 3 processus !\n") ;

    strcpy(msg,"Message Broadcast");
    size=sizeof(char)*strlen(msg);
    if (myid==0)
        fprintf(stderr,"%d envoie <%s>\n",myid , msg) ;
    /* c'est le processus 0 qui est l'envoyeur */

    MPI_Bcast((void*) msg, size, MPI_CHAR,0, MPI_COMM_WORLD) ;
    fprintf(stderr,"%d recoit [%s]\n",myid,msg) ;
    endwtime = MPI_Wtime();
    printf("Temps ecoule sur %d = %f\n", myid, endwtime-startwtime);
    MPI_Finalize();

    return 0;
}