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
24static_assert(noexcept(std::declval<const std::jthread&>().joinable()));
25
26int 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

source code of libcxx/test/std/thread/thread.jthread/joinable.pass.cpp