root/ompi/mca/io/romio321/romio/test/excl.c

DEFINITIONS

1. main

   1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
   2 /*  
   3  *  (C) 2001 by Argonne National Laboratory.
   4  *      See COPYRIGHT in top-level directory.
   5  */
   6 #include "mpi.h"
   7 #include <stdio.h>
   8 #include <string.h>
   9 #include <stdlib.h>
  10 
  11 /* tests MPI_MODE_EXCL */
  12 
  13 int main(int argc, char **argv)
  14 {
  15     MPI_File fh;
  16     int rank, len, err, i;
  17     int errs=0, toterrs;
  18     char *filename;
  19 
  20     MPI_Init(&argc,&argv);
  21     MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  22 
  23 /* process 0 takes the file name as a command-line argument and 
  24    broadcasts it to other processes */
  25     if (!rank) {
  26         i = 1;
  27         while ((i < argc) && strcmp("-fname", *argv)) {
  28             i++;
  29             argv++;
  30         }
  31         if (i >= argc) {
  32             fprintf(stderr, "\n*#  Usage: excl -fname filename\n\n");
  33             MPI_Abort(MPI_COMM_WORLD, 1);
  34         }
  35         argv++;
  36         len = strlen(*argv);
  37         filename = (char *) malloc(len+10);
  38         strcpy(filename, *argv);
  39         MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
  40         MPI_Bcast(filename, len+10, MPI_CHAR, 0, MPI_COMM_WORLD);
  41     }
  42     else {
  43         MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
  44         filename = (char *) malloc(len+10);
  45         MPI_Bcast(filename, len+10, MPI_CHAR, 0, MPI_COMM_WORLD);
  46     }
  47     
  48 
  49     if (!rank) MPI_File_delete(filename, MPI_INFO_NULL);
  50     MPI_Barrier(MPI_COMM_WORLD);
  51 
  52     /* this open should succeed */
  53     err = MPI_File_open(MPI_COMM_WORLD, filename, 
  54          MPI_MODE_CREATE | MPI_MODE_EXCL | MPI_MODE_RDWR, MPI_INFO_NULL , &fh);
  55     if (err != MPI_SUCCESS) {
  56         errs++;
  57         fprintf(stderr, "Process %d: open failed when it should have succeeded\n", rank);
  58     }
  59     else MPI_File_close(&fh);
  60 
  61     MPI_Barrier(MPI_COMM_WORLD);
  62 
  63     /* this open should fail */
  64     err = MPI_File_open(MPI_COMM_WORLD, filename, 
  65          MPI_MODE_CREATE | MPI_MODE_EXCL | MPI_MODE_RDWR, MPI_INFO_NULL , &fh);
  66     if (err == MPI_SUCCESS) {
  67         errs++;
  68         fprintf(stderr, "Process %d: open succeeded when it should have failed\n", rank);
  69     }
  70 
  71     MPI_Allreduce( &errs, &toterrs, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD );
  72     if (rank == 0) {
  73         if( toterrs > 0) {
  74             fprintf( stderr, "Found %d errors\n", toterrs );
  75         }
  76         else {
  77             fprintf( stdout, " No Errors\n" );
  78         }
  79     }
  80 
  81     free(filename);
  82     MPI_Finalize();
  83     return 0; 
  84 }