v1/__new/interference_size.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___NEW_INTERFERENCE_SIZE_H
0010 #define _LIBCPP___NEW_INTERFERENCE_SIZE_H
0011
0012 #include <__config>
0013 #include <__cstddef/size_t.h>
0014
0015 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0016 #  pragma GCC system_header
0017 #endif
0018
0019 _LIBCPP_BEGIN_NAMESPACE_STD
0020
0021 #if _LIBCPP_STD_VER >= 17
0022
0023 #  if defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE)
0024
0025 inline constexpr size_t hardware_destructive_interference_size  = __GCC_DESTRUCTIVE_SIZE;
0026 inline constexpr size_t hardware_constructive_interference_size = __GCC_CONSTRUCTIVE_SIZE;
0027
0028 #  endif // defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE)
0029
0030 #endif // _LIBCPP_STD_VER >= 17
0031
0032 _LIBCPP_END_NAMESPACE_STD
0033
0034 #endif // _LIBCPP___NEW_INTERFERENCE_SIZE_H