libgfortran/caf/single.c

   1 /* Single-image implementation of GNU Fortran Coarray Library
   2    Copyright (C) 2011
   3    Free Software Foundation, Inc.
   4    Contributed by Tobias Burnus <burnus@net-b.de>
   5
   6 This file is part of the GNU Fortran Coarray Runtime Library (libcaf).
   7
   8 Libcaf is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 Libcaf is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  */
  26
  27 #include "libcaf.h"
  28 #include <stdio.h>  /* For fputs and fprintf.  */
  29 #include <stdlib.h> /* For exit and malloc.  */
  30 #include <string.h> /* For memcpy and memset.  */
  31 #include <stdarg.h> /* For variadic arguments.  */
  32
  33 /* Define GFC_CAF_CHECK to enable run-time checking.  */
  34 /* #define GFC_CAF_CHECK  1  */
  35
  36 /* Single-image implementation of the CAF library.
  37    Note: For performance reasons -fcoarry=single should be used
  38    rather than this library.  */
  39
  40 /* Global variables.  */
  41 caf_static_t *caf_static_list = NULL;
  42
  43
  44 /* Keep in sync with mpi.c.  */
  45 static void
  46 caf_runtime_error (const char *message, ...)
  47 {
  48   va_list ap;
  49   fprintf (stderr, "Fortran runtime error: ");
  50   va_start (ap, message);
  51   vfprintf (stderr, message, ap);
  52   va_end (ap);
  53   fprintf (stderr, "\n");
  54
  55   /* FIXME: Shutdown the Fortran RTL to flush the buffer.  PR 43849.  */
  56   exit (EXIT_FAILURE);
  57 }
  58
  59 void
  60 _gfortran_caf_init (int *argc __attribute__ ((unused)),
  61                     char ***argv __attribute__ ((unused)),
  62                     int *this_image, int *num_images)
  63 {
  64   *this_image = 1;
  65   *num_images = 1;
  66 }
  67
  68
  69 void
  70 _gfortran_caf_finalize (void)
  71 {
  72   while (caf_static_list != NULL)
  73     {
  74       caf_static_t *tmp = caf_static_list->prev;
  75       free (caf_static_list->token[0]);
  76       free (caf_static_list->token);
  77       free (caf_static_list);
  78       caf_static_list = tmp;
  79     }
  80 }
  81
  82
  83 void *
  84 _gfortran_caf_register (ptrdiff_t size, caf_register_t type, void **token,
  85                         int *stat, char *errmsg, int errmsg_len)
  86 {
  87   void *local;
  88
  89   local = malloc (size);
  90   token = malloc (sizeof (void*) * 1);
  91   token[0] = local;
  92
  93   if (unlikely (local == NULL || token == NULL))
  94     {
  95       const char msg[] = "Failed to allocate coarray";
  96       if (stat)
  97         {
  98           *stat = 1;
  99           if (errmsg_len > 0)
 100             {
 101               int len = ((int) sizeof (msg) > errmsg_len) ? errmsg_len
 102                                                           : (int) sizeof (msg);
 103               memcpy (errmsg, msg, len);
 104               if (errmsg_len > len)
 105                 memset (&errmsg[len], ' ', errmsg_len-len);
 106             }
 107           return NULL;
 108         }
 109       else
 110           caf_runtime_error (msg);
 111     }
 112
 113   if (stat)
 114     *stat = 0;
 115
 116   if (type == CAF_REGTYPE_COARRAY_STATIC)
 117     {
 118       caf_static_t *tmp = malloc (sizeof (caf_static_t));
 119       tmp->prev  = caf_static_list;
 120       tmp->token = token;
 121       caf_static_list = tmp;
 122     }
 123   return local;
 124 }
 125
 126
 127 void
 128 _gfortran_caf_deregister (void **token, int *stat,
 129                           char *errmsg __attribute__ ((unused)),
 130                           int errmsg_len __attribute__ ((unused)))
 131 {
 132   free (*token);
 133   free (token);
 134
 135   if (stat)
 136     *stat = 0;
 137 }
 138
 139
 140 void
 141 _gfortran_caf_sync_all (int *stat,
 142                         char *errmsg __attribute__ ((unused)),
 143                         int errmsg_len __attribute__ ((unused)))
 144 {
 145   if (stat)
 146     *stat = 0;
 147 }
 148
 149
 150 void
 151 _gfortran_caf_sync_images (int count __attribute__ ((unused)),
 152                            int images[] __attribute__ ((unused)),
 153                            int *stat,
 154                            char *errmsg __attribute__ ((unused)),
 155                            int errmsg_len __attribute__ ((unused)))
 156 {
 157 #ifdef GFC_CAF_CHECK
 158   int i;
 159
 160   for (i = 0; i < count; i++)
 161     if (images[i] != 1)
 162       {
 163         fprintf (stderr, "COARRAY ERROR: Invalid image index %d to SYNC "
 164                  "IMAGES", images[i]);
 165         exit (EXIT_FAILURE);
 166       }
 167 #endif
 168
 169   if (stat)
 170     *stat = 0;
 171 }
 172
 173
 174 void
 175 _gfortran_caf_error_stop_str (const char *string, int32_t len)
 176 {
 177   fputs ("ERROR STOP ", stderr);
 178   while (len--)
 179     fputc (*(string++), stderr);
 180   fputs ("\n", stderr);
 181
 182   exit (1);
 183 }
 184
 185
 186 void
 187 _gfortran_caf_error_stop (int32_t error)
 188 {
 189   fprintf (stderr, "ERROR STOP %d\n", error);
 190   exit (error);
 191 }