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
  32 /* Define GFC_CAF_CHECK to enable run-time checking.  */
  33 /* #define GFC_CAF_CHECK  1  */
  34
  35 /* Single-image implementation of the CAF library.
  36    Note: For performance reasons -fcoarry=single should be used
  37    rather than this library.  */
  38
  39 /* Global variables.  */
  40 caf_static_t *caf_static_list = NULL;
  41
  42
  43 void
  44 _gfortran_caf_init (int *argc __attribute__ ((unused)),
  45                     char ***argv __attribute__ ((unused)),
  46                     int *this_image, int *num_images)
  47 {
  48   *this_image = 1;
  49   *num_images = 1;
  50 }
  51
  52
  53 void
  54 _gfortran_caf_finalize (void)
  55 {
  56   while (caf_static_list != NULL)
  57     {
  58       free(caf_static_list->token[0]);
  59       caf_static_list = caf_static_list->prev;
  60     }
  61 }
  62
  63
  64 void *
  65 _gfortran_caf_register (ptrdiff_t size, caf_register_t type, void **token,
  66                         int *stat, char *errmsg, int errmsg_len)
  67 {
  68   void *local;
  69
  70   local = malloc (size);
  71   token = malloc (sizeof (void*) * 1);
  72   token[0] = local;
  73
  74   if (unlikely (local == NULL || token == NULL))
  75     {
  76       if (stat)
  77         {
  78           *stat = 1;
  79           if (errmsg_len > 0)
  80             {
  81               const char msg[] = "Failed to allocate coarray";
  82               int len = ((int) sizeof (msg) > errmsg_len) ? errmsg_len
  83                                                           : (int) sizeof (msg);
  84               memcpy (errmsg, msg, len);
  85               if (errmsg_len > len)
  86                 memset (&errmsg[len], ' ', errmsg_len-len);
  87             }
  88           return NULL;
  89         }
  90       else
  91         {
  92           fprintf (stderr, "ERROR: Failed to allocate coarray");
  93           exit (1);
  94         }
  95     }
  96
  97   if (stat)
  98     *stat = 0;
  99
 100   if (type == CAF_REGTYPE_COARRAY_STATIC)
 101     {
 102       caf_static_t *tmp = malloc (sizeof (caf_static_t));
 103       tmp->prev  = caf_static_list;
 104       tmp->token = token;
 105       caf_static_list = tmp;
 106     }
 107   return local;
 108 }
 109
 110
 111 int
 112 _gfortran_caf_deregister (void **token __attribute__ ((unused)))
 113 {
 114   return 0;
 115 }
 116
 117
 118 void
 119 _gfortran_caf_sync_all (int *stat,
 120                         char *errmsg __attribute__ ((unused)),
 121                         int errmsg_len __attribute__ ((unused)))
 122 {
 123   if (stat)
 124     *stat = 0;
 125 }
 126
 127
 128 void
 129 _gfortran_caf_sync_images (int count __attribute__ ((unused)),
 130                            int images[] __attribute__ ((unused)),
 131                            int *stat,
 132                            char *errmsg __attribute__ ((unused)),
 133                            int errmsg_len __attribute__ ((unused)))
 134 {
 135 #ifdef GFC_CAF_CHECK
 136   int i;
 137
 138   for (i = 0; i < count; i++)
 139     if (images[i] != 1)
 140       {
 141         fprintf (stderr, "COARRAY ERROR: Invalid image index %d to SYNC "
 142                  "IMAGES", images[i]);
 143         exit (1);
 144       }
 145 #endif
 146
 147   if (stat)
 148     *stat = 0;
 149 }
 150
 151
 152 void
 153 _gfortran_caf_error_stop_str (const char *string, int32_t len)
 154 {
 155   fputs ("ERROR STOP ", stderr);
 156   while (len--)
 157     fputc (*(string++), stderr);
 158   fputs ("\n", stderr);
 159
 160   exit (1);
 161 }
 162
 163
 164 void
 165 _gfortran_caf_error_stop (int32_t error)
 166 {
 167   fprintf (stderr, "ERROR STOP %d\n", error);
 168   exit (error);
 169 }