69 строки
2.0 KiB
C
69 строки
2.0 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; -*- */
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#include "mpi.h"
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#include "mpio.h" /* not necessary with MPICH 1.1.1 or HPMPI 1.4 */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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/* tests MPI_MODE_EXCL */
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int main(int argc, char **argv)
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{
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MPI_File fh;
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int rank, len, err, i;
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char *filename;
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MPI_Init(&argc,&argv);
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MPI_Comm_rank(MPI_COMM_WORLD, &rank);
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/* process 0 takes the file name as a command-line argument and
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broadcasts it to other processes */
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if (!rank) {
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i = 1;
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while ((i < argc) && strcmp("-fname", *argv)) {
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i++;
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argv++;
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}
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if (i >= argc) {
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fprintf(stderr, "\n*# Usage: excl -fname filename\n\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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}
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argv++;
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len = strlen(*argv);
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filename = (char *) malloc(len+10);
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strcpy(filename, *argv);
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MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
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MPI_Bcast(filename, len+10, MPI_CHAR, 0, MPI_COMM_WORLD);
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}
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else {
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MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
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filename = (char *) malloc(len+10);
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MPI_Bcast(filename, len+10, MPI_CHAR, 0, MPI_COMM_WORLD);
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}
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if (!rank) MPI_File_delete(filename, MPI_INFO_NULL);
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MPI_Barrier(MPI_COMM_WORLD);
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/* this open should succeed */
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err = MPI_File_open(MPI_COMM_WORLD, filename,
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MPI_MODE_CREATE | MPI_MODE_EXCL | MPI_MODE_RDWR, MPI_INFO_NULL , &fh);
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if (err != MPI_SUCCESS)
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fprintf(stderr, "Process %d: open failed when it should have succeeded\n", rank);
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else MPI_File_close(&fh);
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MPI_Barrier(MPI_COMM_WORLD);
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/* this open should fail */
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err = MPI_File_open(MPI_COMM_WORLD, filename,
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MPI_MODE_CREATE | MPI_MODE_EXCL | MPI_MODE_RDWR, MPI_INFO_NULL , &fh);
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if (err == MPI_SUCCESS)
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fprintf(stderr, "Process %d: open succeeded when it should have failed\n", rank);
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if (!rank) fprintf(stderr, "Done\n");
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free(filename);
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MPI_Finalize();
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return 0;
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}
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