1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #ifndef _LIBCPP___ATOMIC_IS_ALWAYS_LOCK_FREE_H
10 #define _LIBCPP___ATOMIC_IS_ALWAYS_LOCK_FREE_H
11 
12 #include <__config>
13 
14 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
15 #  pragma GCC system_header
16 #endif
17 
18 _LIBCPP_BEGIN_NAMESPACE_STD
19 
20 template <class _Tp>
21 struct __libcpp_is_always_lock_free {
22   // __atomic_always_lock_free is available in all Standard modes
23   static const bool __value = __atomic_always_lock_free(sizeof(_Tp), 0);
24 };
25 
26 _LIBCPP_END_NAMESPACE_STD
27 
28 #endif // _LIBCPP___ATOMIC_IS_ALWAYS_LOCK_FREE_H
29