1 files changed, 104 insertions, 0 deletions
diff --git a/libgomp/single.c b/libgomp/single.c
new file mode 100644
index 000000000..8c5ade11f
--- /dev/null
+++ b/libgomp/single.c
@@ -0,0 +1,104 @@
+/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc.
+   Contributed by Richard Henderson <rth@redhat.com>.
+
+   This file is part of the GNU OpenMP Library (libgomp).
+
+   Libgomp 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.
+
+   Libgomp 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/>.  */
+
+/* This file handles the SINGLE construct.  */
+
+#include "libgomp.h"
+
+
+/* This routine is called when first encountering a SINGLE construct that
+   doesn't have a COPYPRIVATE clause.  Returns true if this is the thread
+   that should execute the clause.  */
+
+bool
+GOMP_single_start (void)
+{
+#ifdef HAVE_SYNC_BUILTINS
+  struct gomp_thread *thr = gomp_thread ();
+  struct gomp_team *team = thr->ts.team;
+  unsigned long single_count;
+
+  if (__builtin_expect (team == NULL, 0))
+    return true;
+
+  single_count = thr->ts.single_count++;
+  return __sync_bool_compare_and_swap (&team->single_count, single_count,
+				       single_count + 1L);
+#else
+  bool ret = gomp_work_share_start (false);
+  if (ret)
+    gomp_work_share_init_done ();
+  gomp_work_share_end_nowait ();
+  return ret;
+#endif
+}
+
+/* This routine is called when first encountering a SINGLE construct that
+   does have a COPYPRIVATE clause.  Returns NULL if this is the thread
+   that should execute the clause; otherwise the return value is pointer
+   given to GOMP_single_copy_end by the thread that did execute the clause.  */
+
+void *
+GOMP_single_copy_start (void)
+{
+  struct gomp_thread *thr = gomp_thread ();
+
+  bool first;
+  void *ret;
+
+  first = gomp_work_share_start (false);
+  
+  if (first)
+    {
+      gomp_work_share_init_done ();
+      ret = NULL;
+    }
+  else
+    {
+      gomp_team_barrier_wait (&thr->ts.team->barrier);
+
+      ret = thr->ts.work_share->copyprivate;
+      gomp_work_share_end_nowait ();
+    }
+
+  return ret;
+}
+
+/* This routine is called when the thread that entered a SINGLE construct
+   with a COPYPRIVATE clause gets to the end of the construct.  */
+
+void
+GOMP_single_copy_end (void *data)
+{
+  struct gomp_thread *thr = gomp_thread ();
+  struct gomp_team *team = thr->ts.team;
+
+  if (team != NULL)
+    {
+      thr->ts.work_share->copyprivate = data;
+      gomp_team_barrier_wait (&team->barrier);
+    }
+
+  gomp_work_share_end_nowait ();
+}