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]] bool joinable() const noexcept; 14 15 #include <atomic> 16 #include <cassert> 17 #include <concepts> 18 #include <thread> 19 #include <type_traits> 20 21 #include "make_test_thread.h" 22 #include "test_macros.h" 23 24 static_assert(noexcept(std::declval<const std::jthread&>().joinable())); 25 26 int main(int, char**) { 27 // Default constructed 28 { 29 const std::jthread jt; 30 std::same_as<bool> decltype(auto) result = jt.joinable(); 31 assert(!result); 32 } 33 34 // Non-default constructed 35 { 36 const std::jthread jt = support::make_test_jthread([] {}); 37 std::same_as<bool> decltype(auto) result = jt.joinable(); 38 assert(result); 39 } 40 41 // Non-default constructed 42 // the thread of execution has not finished 43 { 44 std::atomic_bool done = false; 45 const std::jthread jt = support::make_test_jthread([&done] { done.wait(false); }); 46 std::same_as<bool> decltype(auto) result = jt.joinable(); 47 done = true; 48 done.notify_all(); 49 assert(result); 50 } 51 52 return 0; 53 } 54