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), nullptr); 24 }; 25 26 _LIBCPP_END_NAMESPACE_STD 27 28 #endif // _LIBCPP___ATOMIC_IS_ALWAYS_LOCK_FREE_H 29