--- /dev/null
+/* Common declarations for all of GNU Fortran libcaf implementations.
+ 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/>. */
+
+#ifndef LIBCAF_H
+#define LIBCAF_H
+
+#include <stdint.h>
+#include <string.h>
+
+/* Definitions of the Fortran 2008 standard; need to kept in sync with
+ ISO_FORTRAN_ENV, cf. libgfortran.h. */
+#define STAT_UNLOCKED 0
+#define STAT_LOCKED 1
+#define STAT_LOCKED_OTHER_IMAGE 2
+#define STAT_STOPPED_IMAGE 3
+
+
+void _gfortran_caf_init (int *, char ***, int *, int *);
+void _gfortran_caf_finalize (void);
+
+int _gfortran_caf_sync_all (char *, int);
+int _gfortran_caf_sync_images (int count, int images[], char *, int);
+
+void _gfortran_caf_critical (void);
+void _gfortran_caf_end_critical (void);
+
+void _gfortran_caf_error_stop_str (const char *, int32_t) __attribute__ ((noreturn));
+void _gfortran_caf_error_stop (int32_t) __attribute__ ((noreturn));
+
+#endif /* LIBCAF_H */
--- /dev/null
+/* MPI 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>
+#include <stdlib.h>
+#include <mpi.h>
+
+/* Define GFC_CAF_CHECK to enable run-time checking. */
+/* #define GFC_CAF_CHECK 1 */
+
+
+static void error_stop (int error) __attribute__ ((noreturn));
+
+/* Global variables. */
+static int caf_this_image;
+static int caf_num_images;
+static MPI_Win caf_world_window;
+
+
+/* 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, int *this_image, int *num_images)
+{
+ int flag;
+
+ /* The following is only the case if one does not have a Fortran
+ main program. */
+ MPI_Initialized (&flag);
+ if (!flag)
+ MPI_Init (argc, argv);
+
+ MPI_Comm_rank (MPI_COMM_WORLD, &caf_this_image);
+ *this_image = caf_this_image + 1;
+ MPI_Comm_size (MPI_COMM_WORLD, &caf_num_images);
+ *num_images = caf_num_images;
+
+ /* Obtain window for CRITICAL section locking. */
+ MPI_Win_create (NULL, 0, 1, MPI_INFO_NULL, MPI_COMM_WORLD,
+ &caf_world_window);
+}
+
+
+/* Finalize coarray program. Note: This is only called before the
+ program ends; thus the MPI_Initialized status of _gfortran_caf_init
+ does not play a role. */
+
+void
+_gfortran_caf_finalize (void)
+{
+ MPI_Win_free (&caf_world_window);
+ MPI_Finalize ();
+}
+
+
+/* SYNC ALL - the return value matches Fortran's STAT argument. */
+
+int
+_gfortran_caf_sync_all (char *errmsg, int errmsg_len)
+{
+ int ierr;
+ ierr = MPI_Barrier (MPI_COMM_WORLD);
+
+ if (ierr && errmsg_len > 0)
+ {
+ const char msg[] = "SYNC ALL failed";
+ int len = ((int) sizeof (msg) > errmsg_len) ? errmsg_len
+ : (int) sizeof (msg);
+ memcpy (errmsg, msg, len);
+ if (errmsg_len > len)
+ memset (&errmsg[len], ' ', errmsg_len-len);
+ }
+
+ /* TODO: Is ierr correct? When should STAT_STOPPED_IMAGE be used? */
+ return ierr;
+}
+
+
+/* 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. The return value matches Fortran's
+ STAT argument. */
+int
+_gfortran_caf_sync_images (int count, int images[], char *errmsg,
+ int errmsg_len)
+{
+ int ierr;
+
+ if (count == 0 || (count == 1 && images[0] == caf_this_image))
+ return 0;
+
+#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(*). */
+ ierr = MPI_Barrier (MPI_COMM_WORLD);
+
+ if (ierr && errmsg_len > 0)
+ {
+ const char msg[] = "SYNC IMAGES failed";
+ int len = ((int) sizeof (msg) > errmsg_len) ? errmsg_len
+ : (int) sizeof (msg);
+ memcpy (errmsg, msg, len);
+ if (errmsg_len > len)
+ memset (&errmsg[len], ' ', errmsg_len-len);
+ }
+
+ /* TODO: Is ierr correct? When should STAT_STOPPED_IMAGE be used? */
+ return ierr;
+}
+
+
+/* CRITICAL BLOCK. */
+
+void
+_gfortran_caf_critical (void)
+{
+ MPI_Win_lock (MPI_LOCK_SHARED, 0, 0, caf_world_window);
+}
+
+
+void
+_gfortran_caf_end_critical (void)
+{
+ MPI_Win_unlock (0, caf_world_window);
+}
+
+
+/* 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);
+}
--- /dev/null
+/* 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);
+}
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