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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include "mpi.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
/* tests MPI_MODE_EXCL */
static void handle_error(int errcode, const char *str)
{
char msg[MPI_MAX_ERROR_STRING];
int resultlen;
MPI_Error_string(errcode, msg, &resultlen);
fprintf(stderr, "%s: %s\n", str, msg);
}
int main(int argc, char **argv)
{
MPI_File fh;
int rank, len, err, i;
int errs = 0, toterrs;
char *filename;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
/* process 0 takes the file name as a command-line argument and
broadcasts it to other processes */
if (!rank) {
i = 1;
while ((i < argc) && strcmp("-fname", *argv)) {
i++;
argv++;
}
if (i >= argc) {
fprintf(stderr, "\n*# Usage: excl -fname filename\n\n");
MPI_Abort(MPI_COMM_WORLD, 1);
}
argv++;
len = strlen(*argv);
filename = (char *) malloc(len + 10);
strcpy(filename, *argv);
MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
MPI_Bcast(filename, len + 10, MPI_CHAR, 0, MPI_COMM_WORLD);
} else {
MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
filename = (char *) malloc(len + 10);
MPI_Bcast(filename, len + 10, MPI_CHAR, 0, MPI_COMM_WORLD);
}
if (!rank)
MPI_File_delete(filename, MPI_INFO_NULL);
MPI_Barrier(MPI_COMM_WORLD);
/* this open should succeed */
err = MPI_File_open(MPI_COMM_WORLD, filename,
MPI_MODE_CREATE | MPI_MODE_EXCL | MPI_MODE_RDWR, MPI_INFO_NULL, &fh);
if (err != MPI_SUCCESS) {
handle_error(err, "MPI_File_open");
errs++;
fprintf(stderr, "Process %d: open failed when it should have succeeded\n", rank);
} else
MPI_File_close(&fh);
MPI_Barrier(MPI_COMM_WORLD);
/* this open should fail */
err = MPI_File_open(MPI_COMM_WORLD, filename,
MPI_MODE_CREATE | MPI_MODE_EXCL | MPI_MODE_RDWR, MPI_INFO_NULL, &fh);
if (err == MPI_SUCCESS) {
errs++;
fprintf(stderr, "Process %d: open succeeded when it should have failed\n", rank);
MPI_File_close(&fh);
}
MPI_Allreduce(&errs, &toterrs, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
if (rank == 0) {
if (toterrs > 0) {
fprintf(stderr, "Found %d errors\n", toterrs);
} else {
fprintf(stdout, " No Errors\n");
}
}
free(filename);
MPI_Finalize();
return 0;
}
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