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 // UNSUPPORTED: no-threads 10 // UNSUPPORTED: c++03, c++11, c++14, c++17 11 // XFAIL: availability-synchronization_library-missing 12 13 // [[nodiscard]] static unsigned int hardware_concurrency() noexcept; 14 15 #include <cassert> 16 #include <concepts> 17 #include <thread> 18 #include <type_traits> 19 20 #include "test_macros.h" 21 22 static_assert(noexcept(std::jthread::hardware_concurrency())); 23 24 int main(int, char**) { 25 std::same_as<unsigned int> decltype(auto) result = std::jthread::hardware_concurrency(); 26 assert(result == std::thread::hardware_concurrency()); 27 28 return 0; 29 } 30