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diff --git a/libgomp/config/linux/bar.h b/libgomp/config/linux/bar.h
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+++ b/libgomp/config/linux/bar.h
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+/* 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 is a Linux specific implementation of a barrier synchronization
+   mechanism for libgomp.  This type is private to the library.  This 
+   implementation uses atomic instructions and the futex syscall.  */
+
+#ifndef GOMP_BARRIER_H
+#define GOMP_BARRIER_H 1
+
+#include "mutex.h"
+
+typedef struct
+{
+  gomp_mutex_t mutex;
+  unsigned total;
+  unsigned arrived;
+  int generation;
+} gomp_barrier_t;
+
+static inline void gomp_barrier_init (gomp_barrier_t *bar, unsigned count)
+{
+  gomp_mutex_init (&bar->mutex);
+  bar->total = count;
+  bar->arrived = 0;
+  bar->generation = 0;
+}
+
+static inline void gomp_barrier_reinit (gomp_barrier_t *bar, unsigned count)
+{
+  gomp_mutex_lock (&bar->mutex);
+  bar->total = count;
+  gomp_mutex_unlock (&bar->mutex);
+}
+
+static inline void gomp_barrier_destroy (gomp_barrier_t *bar)
+{
+  /* Before destroying, make sure all threads have left the barrier.  */
+  gomp_mutex_lock (&bar->mutex);
+}
+
+extern void gomp_barrier_wait (gomp_barrier_t *);
+extern void gomp_barrier_wait_end (gomp_barrier_t *, bool);
+
+static inline bool gomp_barrier_wait_start (gomp_barrier_t *bar)
+{
+  gomp_mutex_lock (&bar->mutex);
+  return ++bar->arrived == bar->total;
+}
+
+#endif /* GOMP_BARRIER_H */