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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <mpi.h>
#include <mpitest.h>
/* test broadcast behavior with non-zero counts but zero-sized types */
int main(int argc, char *argv[])
{
int i, type_size;
MPI_Datatype type = MPI_DATATYPE_NULL;
char *buf = NULL;
int wrank, wsize;
MTest_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &wrank);
MPI_Comm_size(MPI_COMM_WORLD, &wsize);
/* a random non-zero sized buffer */
#define NELEM (10)
buf = malloc(NELEM * sizeof(int));
assert(buf);
for (i = 0; i < NELEM; i++) {
buf[i] = wrank * NELEM + i;
}
/* create a zero-size type */
MPI_Type_contiguous(0, MPI_INT, &type);
MPI_Type_commit(&type);
MPI_Type_size(type, &type_size);
assert(type_size == 0);
/* do the broadcast, which will break on some MPI implementations */
MPI_Bcast(buf, NELEM, type, 0, MPI_COMM_WORLD);
/* check that the buffer remains unmolested */
for (i = 0; i < NELEM; i++) {
assert(buf[i] == wrank * NELEM + i);
}
free(buf);
MPI_Type_free(&type);
MTest_Finalize(0);
return 0;
}
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