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/***************************************************************************/
/*           ____Demonstrates the use of make_seed with MPI____            */
/* 'make_sprng_seed' is called to produce a new seed each time the program */
/* is run. The same seed is produced on each process.                      */
/***************************************************************************/

#include <stdio.h>
#include <mpi.h>                /* MPI header file                         */


/* Uncomment the following line to get the interface with pointer checking */
/*#define CHECK_POINTERS                                                   */

#define USE_MPI               
#include "sprng.h"            


main(int argc, char *argv[])
{
    int streamnum, nstreams, seed, *stream, i, myid, nprocs;
    double rn;
    int gtype;  

    MPI_Init(&argc, &argv);                
    MPI_Comm_rank(MPI_COMM_WORLD, &myid);  
    MPI_Comm_size(MPI_COMM_WORLD, &nprocs);

    streamnum = myid;
    nstreams = nprocs;        /* one stream per processor                */
    seed = make_sprng_seed(); /* make new seed each time program is run  */

    /*--- node 0 is reading in a generator type */
    if (myid == 0) {
#include "gen_types_menu.h"
        printf("Type in a generator type (integers: 0,1,2,3,4,5):  ");
        scanf("%d", &gtype);
    }
    MPI_Bcast(&gtype,1,MPI_INT,0,MPI_COMM_WORLD );

    /* Seed should be the same on all processes                              */
    printf("Process %d: seed = %16d\n", myid, seed);

    stream = init_sprng(gtype,streamnum,nstreams,seed,SPRNG_DEFAULT); /*initialize stream*/
    printf("\n\nProcess %d: Print information about stream:\n",myid);
    print_sprng(stream);

    /************************ print random numbers ***************************/

    for (i=0;i<3;i++) {
        rn = sprng(stream);     /* generate double precision random number */
        printf("process %d, random number %d: %f\n", myid, i+1, rn);
    }

    free_sprng(stream);           /* free memory used to store stream state  */

    MPI_Finalize();       /* Terminate MPI                           */
}