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: libcpp-has-no-experimental-stop_token 11 // UNSUPPORTED: c++03, c++11, c++14, c++17 12 // XFAIL: availability-synchronization_library-missing 13 14 // [[nodiscard]] bool joinable() const noexcept; 15 16 #include <atomic> 17 #include <cassert> 18 #include <concepts> 19 #include <thread> 20 #include <type_traits> 21 22 #include "make_test_thread.h" 23 #include "test_macros.h" 24 25 static_assert(noexcept(std::declval<const std::jthread&>().joinable())); 26 main(int,char **)27int main(int, char**) { 28 // Default constructed 29 { 30 const std::jthread jt; 31 std::same_as<bool> decltype(auto) result = jt.joinable(); 32 assert(!result); 33 } 34 35 // Non-default constructed 36 { 37 const std::jthread jt = support::make_test_jthread([] {}); 38 std::same_as<bool> decltype(auto) result = jt.joinable(); 39 assert(result); 40 } 41 42 // Non-default constructed 43 // the thread of execution has not finished 44 { 45 std::atomic_bool done = false; 46 const std::jthread jt = support::make_test_jthread([&done] { done.wait(false); }); 47 std::same_as<bool> decltype(auto) result = jt.joinable(); 48 done = true; 49 done.notify_all(); 50 assert(result); 51 } 52 53 return 0; 54 } 55