1 files changed, 91 insertions, 0 deletions
diff --git a/libgomp/single.c b/libgomp/single.c
new file mode 100644
index 00000000000..dde05d9ceb8
--- /dev/null
+++ b/libgomp/single.c
@@ -0,0 +1,91 @@
+/* Copyright (C) 2005 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 Lesser General Public License as published by
+   the Free Software Foundation; either version 2.1 of the License, 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 Lesser General Public License for
+   more details.
+
+   You should have received a copy of the GNU Lesser General Public License 
+   along with libgomp; see the file COPYING.LIB.  If not, write to the
+   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+/* As a special exception, if you link this library with other files, some
+   of which are compiled with GCC, to produce an executable, this library
+   does not by itself cause the resulting executable to be covered by the
+   GNU General Public License.  This exception does not however invalidate
+   any other reasons why the executable file might be covered by the GNU
+   General Public License.  */
+
+/* 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)
+{
+  bool ret = gomp_work_share_start (false);
+  gomp_mutex_unlock (&gomp_thread ()->ts.work_share->lock);
+  gomp_work_share_end_nowait ();
+  return ret;
+}
+
+/* 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);
+  gomp_mutex_unlock (&thr->ts.work_share->lock);
+  
+  if (first)
+    ret = NULL;
+  else
+    {
+      gomp_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_barrier_wait (&team->barrier);
+    }
+
+  gomp_work_share_end_nowait ();
+}