gcc/libgfortran/caf/mpi.c

379 lines
8.7 KiB
C

/* MPI implementation of GNU Fortran Coarray Library
Copyright (C) 2011-2014 Free Software Foundation, Inc.
Contributed by Tobias Burnus <burnus@net-b.de>
This file is part of the GNU Fortran Coarray Runtime Library (libcaf).
Libcaf is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
Libcaf is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "libcaf.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h> /* For memcpy. */
#include <stdarg.h> /* For variadic arguments. */
#include <mpi.h>
/* Define GFC_CAF_CHECK to enable run-time checking. */
/* #define GFC_CAF_CHECK 1 */
typedef void ** mpi_token_t;
#define TOKEN(X) ((mpi_token_t) (X))
static void error_stop (int error) __attribute__ ((noreturn));
/* Global variables. */
static int caf_mpi_initialized;
static int caf_this_image;
static int caf_num_images;
static int caf_is_finalized;
caf_static_t *caf_static_list = NULL;
/* Keep in sync with single.c. */
static void
caf_runtime_error (const char *message, ...)
{
va_list ap;
fprintf (stderr, "Fortran runtime error on image %d: ", caf_this_image);
va_start (ap, message);
vfprintf (stderr, message, ap);
va_end (ap);
fprintf (stderr, "\n");
/* FIXME: Shutdown the Fortran RTL to flush the buffer. PR 43849. */
/* FIXME: Do some more effort than just MPI_ABORT. */
MPI_Abort (MPI_COMM_WORLD, EXIT_FAILURE);
/* Should be unreachable, but to make sure also call exit. */
exit (EXIT_FAILURE);
}
/* Initialize coarray program. This routine assumes that no other
MPI initialization happened before; otherwise MPI_Initialized
had to be used. As the MPI library might modify the command-line
arguments, the routine should be called before the run-time
libaray is initialized. */
void
_gfortran_caf_init (int *argc, char ***argv)
{
if (caf_num_images == 0)
{
/* caf_mpi_initialized is only true if the main program is
not written in Fortran. */
MPI_Initialized (&caf_mpi_initialized);
if (!caf_mpi_initialized)
MPI_Init (argc, argv);
MPI_Comm_size (MPI_COMM_WORLD, &caf_num_images);
MPI_Comm_rank (MPI_COMM_WORLD, &caf_this_image);
caf_this_image++;
}
}
/* Finalize coarray program. */
void
_gfortran_caf_finalize (void)
{
while (caf_static_list != NULL)
{
caf_static_t *tmp = caf_static_list->prev;
free (TOKEN (caf_static_list->token)[caf_this_image-1]);
free (TOKEN (caf_static_list->token));
free (caf_static_list);
caf_static_list = tmp;
}
if (!caf_mpi_initialized)
MPI_Finalize ();
caf_is_finalized = 1;
}
int
_gfortran_caf_this_image (int distance __attribute__ ((unused)))
{
return caf_this_image;
}
int
_gfortran_caf_num_images (int distance __attribute__ ((unused)),
int failed __attribute__ ((unused)))
{
return caf_num_images;
}
void *
_gfortran_caf_register (size_t size, caf_register_t type, caf_token_t *token,
int *stat, char *errmsg, int errmsg_len)
{
void *local;
int err;
if (unlikely (caf_is_finalized))
goto error;
/* Start MPI if not already started. */
if (caf_num_images == 0)
_gfortran_caf_init (NULL, NULL);
/* Token contains only a list of pointers. */
local = malloc (size);
*token = malloc (sizeof (mpi_token_t) * caf_num_images);
if (unlikely (local == NULL || *token == NULL))
goto error;
/* token[img-1] is the address of the token in image "img". */
err = MPI_Allgather (&local, sizeof (void*), MPI_BYTE, TOKEN (*token),
sizeof (void*), MPI_BYTE, MPI_COMM_WORLD);
if (unlikely (err))
{
free (local);
free (*token);
goto error;
}
if (type == CAF_REGTYPE_COARRAY_STATIC)
{
caf_static_t *tmp = malloc (sizeof (caf_static_t));
tmp->prev = caf_static_list;
tmp->token = *token;
caf_static_list = tmp;
}
if (stat)
*stat = 0;
return local;
error:
{
char *msg;
if (caf_is_finalized)
msg = "Failed to allocate coarray - there are stopped images";
else
msg = "Failed to allocate coarray";
if (stat)
{
*stat = caf_is_finalized ? STAT_STOPPED_IMAGE : 1;
if (errmsg_len > 0)
{
int len = ((int) strlen (msg) > errmsg_len) ? errmsg_len
: (int) strlen (msg);
memcpy (errmsg, msg, len);
if (errmsg_len > len)
memset (&errmsg[len], ' ', errmsg_len-len);
}
}
else
caf_runtime_error (msg);
}
return NULL;
}
void
_gfortran_caf_deregister (caf_token_t *token, int *stat, char *errmsg, int errmsg_len)
{
if (unlikely (caf_is_finalized))
{
const char msg[] = "Failed to deallocate coarray - "
"there are stopped images";
if (stat)
{
*stat = STAT_STOPPED_IMAGE;
if (errmsg_len > 0)
{
int len = ((int) sizeof (msg) - 1 > errmsg_len)
? errmsg_len : (int) sizeof (msg) - 1;
memcpy (errmsg, msg, len);
if (errmsg_len > len)
memset (&errmsg[len], ' ', errmsg_len-len);
}
return;
}
caf_runtime_error (msg);
}
_gfortran_caf_sync_all (NULL, NULL, 0);
if (stat)
*stat = 0;
free (TOKEN (*token)[caf_this_image-1]);
free (*token);
}
void
_gfortran_caf_sync_all (int *stat, char *errmsg, int errmsg_len)
{
int ierr;
if (unlikely (caf_is_finalized))
ierr = STAT_STOPPED_IMAGE;
else
ierr = MPI_Barrier (MPI_COMM_WORLD);
if (stat)
*stat = ierr;
if (ierr)
{
char *msg;
if (caf_is_finalized)
msg = "SYNC ALL failed - there are stopped images";
else
msg = "SYNC ALL failed";
if (errmsg_len > 0)
{
int len = ((int) strlen (msg) > errmsg_len) ? errmsg_len
: (int) strlen (msg);
memcpy (errmsg, msg, len);
if (errmsg_len > len)
memset (&errmsg[len], ' ', errmsg_len-len);
}
else
caf_runtime_error (msg);
}
}
/* SYNC IMAGES. Note: SYNC IMAGES(*) is passed as count == -1 while
SYNC IMAGES([]) has count == 0. Note further that SYNC IMAGES(*)
is not equivalent to SYNC ALL. */
void
_gfortran_caf_sync_images (int count, int images[], int *stat, char *errmsg,
int errmsg_len)
{
int ierr;
if (count == 0 || (count == 1 && images[0] == caf_this_image))
{
if (stat)
*stat = 0;
return;
}
#ifdef GFC_CAF_CHECK
{
int i;
for (i = 0; i < count; i++)
if (images[i] < 1 || images[i] > caf_num_images)
{
fprintf (stderr, "COARRAY ERROR: Invalid image index %d to SYNC "
"IMAGES", images[i]);
error_stop (1);
}
}
#endif
/* FIXME: SYNC IMAGES with a nontrivial argument cannot easily be
mapped to MPI communicators. Thus, exist early with an error message. */
if (count > 0)
{
fprintf (stderr, "COARRAY ERROR: SYNC IMAGES not yet implemented");
error_stop (1);
}
/* Handle SYNC IMAGES(*). */
if (unlikely (caf_is_finalized))
ierr = STAT_STOPPED_IMAGE;
else
ierr = MPI_Barrier (MPI_COMM_WORLD);
if (stat)
*stat = ierr;
if (ierr)
{
char *msg;
if (caf_is_finalized)
msg = "SYNC IMAGES failed - there are stopped images";
else
msg = "SYNC IMAGES failed";
if (errmsg_len > 0)
{
int len = ((int) strlen (msg) > errmsg_len) ? errmsg_len
: (int) strlen (msg);
memcpy (errmsg, msg, len);
if (errmsg_len > len)
memset (&errmsg[len], ' ', errmsg_len-len);
}
else
caf_runtime_error (msg);
}
}
/* ERROR STOP the other images. */
static void
error_stop (int error)
{
/* FIXME: Shutdown the Fortran RTL to flush the buffer. PR 43849. */
/* FIXME: Do some more effort than just MPI_ABORT. */
MPI_Abort (MPI_COMM_WORLD, error);
/* Should be unreachable, but to make sure also call exit. */
exit (error);
}
/* ERROR STOP function for string arguments. */
void
_gfortran_caf_error_stop_str (const char *string, int32_t len)
{
fputs ("ERROR STOP ", stderr);
while (len--)
fputc (*(string++), stderr);
fputs ("\n", stderr);
error_stop (1);
}
/* ERROR STOP function for numerical arguments. */
void
_gfortran_caf_error_stop (int32_t error)
{
fprintf (stderr, "ERROR STOP %d\n", error);
error_stop (error);
}