1 files changed, 28 insertions, 0 deletions
diff --git a/contrib/llvm-project/libcxx/include/__atomic/is_always_lock_free.h b/contrib/llvm-project/libcxx/include/__atomic/is_always_lock_free.h
new file mode 100644
index 000000000000..f928e79f70ce
--- /dev/null
+++ b/contrib/llvm-project/libcxx/include/__atomic/is_always_lock_free.h
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___ATOMIC_IS_ALWAYS_LOCK_FREE_H
+#define _LIBCPP___ATOMIC_IS_ALWAYS_LOCK_FREE_H
+
+#include <__config>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _Tp>
+struct __libcpp_is_always_lock_free {
+  // __atomic_always_lock_free is available in all Standard modes
+  static const bool __value = __atomic_always_lock_free(sizeof(_Tp), nullptr);
+};
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___ATOMIC_IS_ALWAYS_LOCK_FREE_H