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// void detach();
15
16#include <atomic>
17#include <cassert>
18#include <chrono>
19#include <concepts>
20#include <functional>
21#include <optional>
22#include <system_error>
23#include <thread>
24#include <type_traits>
25
26#include "make_test_thread.h"
27#include "test_macros.h"
28
29int main(int, char**) {
30 // Effects: The thread represented by *this continues execution without the calling thread blocking.
31 {
32 std::atomic_bool start{false};
33 std::atomic_bool done{false};
34 std::optional<std::jthread> jt = support::make_test_jthread([&start, &done] {
35 start.wait(false);
36 done = true;
37 });
38
39 // If it blocks, it will deadlock here
40 jt->detach();
41
42 jt.reset();
43
44 // The other thread continues execution
45 start = true;
46 start.notify_all();
47 while (!done) {
48 }
49 }
50
51 // Postconditions: get_id() == id().
52 {
53 std::jthread jt = support::make_test_jthread([] {});
54 assert(jt.get_id() != std::jthread::id());
55 jt.detach();
56 assert(jt.get_id() == std::jthread::id());
57 }
58
59#if !defined(TEST_HAS_NO_EXCEPTIONS)
60 // Throws: system_error when an exception is required ([thread.req.exception]).
61 // invalid_argument - if the thread is not joinable.
62 {
63 std::jthread jt;
64 try {
65 jt.detach();
66 assert(false);
67 } catch (const std::system_error& err) {
68 assert(err.code() == std::errc::invalid_argument);
69 }
70 }
71#endif
72
73 std::this_thread::sleep_for(rtime: std::chrono::milliseconds{2});
74 return 0;
75}
76

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