/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *  (C) 2001 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

/*

 * A simple code that can be used to test the basic message passing or

 * debug parts of the code.  This is less a test than a way to exercise

 * the primary code path for short message send-receives

 */

#include <stdio.h>

#include "mpi.h"

int main( int argc, char *argv[] )

{

    int myrank, size, src=0, dest=1, msgsize=1;

    int buf[20];

    MPI_Init( &argc, &argv );

    MPI_Comm_size( MPI_COMM_WORLD, &size );

    MPI_Comm_rank( MPI_COMM_WORLD, &myrank );

    if (myrank == src) {

        buf[0] = 0xabcd0123;

	MPI_Send( buf, msgsize, MPI_INT, dest, 0, MPI_COMM_WORLD );

    }

    else if (myrank == dest) {

        buf[0] = 0xffffffff;

	MPI_Recv( buf, msgsize, MPI_INT, src, 0, MPI_COMM_WORLD, 

		  MPI_STATUS_IGNORE );

	if (buf[0] != 0xabcd0123) {

	    printf( "Expected %x but got %x\n", 0xabcd0123, buf[0] );

	    fflush(stdout);

	}

    }

    MPI_Finalize();

    return 0;

}