1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___THREAD_HARDWARE_CONCURRENCY_H
11#define _LIBCPP___THREAD_HARDWARE_CONCURRENCY_H
12
13#include <__config>
14
15#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
16# pragma GCC system_header
17#endif
18
19_LIBCPP_PUSH_MACROS
20#include <__undef_macros>
21
22_LIBCPP_BEGIN_NAMESPACE_STD
23_LIBCPP_BEGIN_EXPLICIT_ABI_ANNOTATIONS
24
25#if _LIBCPP_HAS_THREADS
26
27[[__nodiscard__]] _LIBCPP_AVAILABILITY_HARDWARE_CONCURRENCY_FREE_FUNCTION
28 _LIBCPP_EXPORTED_FROM_ABI unsigned __thread_hardware_concurrency() _NOEXCEPT;
29
30#endif // _LIBCPP_HAS_THREADS
31
32_LIBCPP_END_EXPLICIT_ABI_ANNOTATIONS
33_LIBCPP_END_NAMESPACE_STD
34
35_LIBCPP_POP_MACROS
36
37#endif // _LIBCPP___THREAD_HARDWARE_CONCURRENCY_H
38