1 files changed, 57 insertions, 0 deletions
diff --git a/libgomp/atomic.c b/libgomp/atomic.c
new file mode 100644
index 00000000000..bad0736e21e
--- /dev/null
+++ b/libgomp/atomic.c
@@ -0,0 +1,57 @@
+/* Copyright (C) 2005-2016 Free Software Foundation, Inc.
+   Contributed by Richard Henderson <rth@redhat.com>.
+
+   This file is part of the GNU Offloading and Multi Processing 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 contains helpers for the ATOMIC construct.  */
+
+#include "libgomp.h"
+
+/* This mutex is used when atomic operations don't exist for the target
+   in the mode requested.  The result is not globally atomic, but works so
+   long as all parallel references are within #pragma omp atomic directives.
+   According to responses received from omp@openmp.org, appears to be within
+   spec.  Which makes sense, since that's how several other compilers
+   handle this situation as well.  */
+
+static gomp_mutex_t atomic_lock;
+
+void
+GOMP_atomic_start (void)
+{
+  gomp_mutex_lock (&atomic_lock);
+}
+
+void
+GOMP_atomic_end (void)
+{
+  gomp_mutex_unlock (&atomic_lock);
+}
+
+#if !GOMP_MUTEX_INIT_0
+static void __attribute__((constructor))
+initialize_atomic (void)
+{
+  gomp_mutex_init (&atomic_lock);
+}
+#endif