1 files changed, 23 insertions, 0 deletions
diff --git a/libcxx/src/atomic.cpp b/libcxx/src/atomic.cpp
new file mode 100644
index 00000000000..dc354df2303
--- /dev/null
+++ b/libcxx/src/atomic.cpp
@@ -0,0 +1,23 @@
+//===------------------------- atomic.cpp ---------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "__mutex_base"
+#include "atomic"
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+_LIBCPP_VISIBLE
+mutex&
+__not_atomic_mut()
+{
+    static mutex m;
+    return m;
+}
+
+_LIBCPP_END_NAMESPACE_STD