re PR fortran/18918 (Eventually support Fortran 2008's coarrays [co-arrays])

2011-03-27  Tobias Burnus  <burnus@net-b.de>

        PR fortran/18918
        * caf/libcaf.h: New - coarray communication library.
        * caf/mpi.c: New.
        * caf/single.c: New.

From-SVN: r171570

1 files changed, 107 insertions, 0 deletions

diff --git a/libgfortran/caf/single.c b/libgfortran/caf/single.c
new file mode 100644
index 0000000..7ee37b3
--- /dev/null
+++ b/libgfortran/caf/single.c
@@ -0,0 +1,107 @@
+/* Single-image implementation of GNU Fortran Coarray Library
+   Copyright (C) 2011
+   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>  /* For fputs and fprintf.  */
+#include <stdlib.h> /* For exit.  */
+
+/* Define GFC_CAF_CHECK to enable run-time checking.  */
+/* #define GFC_CAF_CHECK  1  */
+
+
+/* Single-image implementation of the CAF library.
+   Note: For performance reasons -fcoarry=single should be used
+   rather than this library.  */
+
+void
+_gfortran_caf_init (int *argc __attribute__ ((unused)),
+		    char ***argv __attribute__ ((unused)),
+		    int *this_image, int *num_images)
+{
+  *this_image = 1;
+  *num_images = 1;
+}
+
+void
+_gfortran_caf_finalize (void)
+{
+}
+
+int
+_gfortran_caf_sync_all (char *errmsg __attribute__ ((unused)),
+			int errmsg_len __attribute__ ((unused)))
+{
+  return 0;
+}
+
+int
+_gfortran_caf_sync_images (int count __attribute__ ((unused)),
+			   int images[] __attribute__ ((unused)),
+			   char *errmsg __attribute__ ((unused)),
+			   int errmsg_len __attribute__ ((unused)))
+{
+#ifdef GFC_CAF_CHECK
+  int i;
+
+  for (i = 0; i < count; i++)
+    if (images[i] != 1)
+      {
+	fprintf (stderr, "COARRAY ERROR: Invalid image index %d to SYNC "
+		 "IMAGES", images[i]);
+	exit (1);
+      }
+#endif
+
+  return 0;
+}
+
+void
+_gfortran_caf_critical (void)
+{
+}
+
+void
+_gfortran_caf_end_critical (void)
+{
+}
+
+void
+_gfortran_caf_error_stop_str (const char *string, int32_t len)
+{
+  fputs ("ERROR STOP ", stderr);
+  while (len--)
+    fputc (*(string++), stderr);
+  fputs ("\n", stderr);
+
+  exit (1);
+}
+
+void
+_gfortran_caf_error_stop (int32_t error)
+{
+  fprintf (stderr, "ERROR STOP %d\n", error);
+  exit (error);
+}