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// void detach();
14
15#include <atomic>
16#include <cassert>
17#include <chrono>
18#include <concepts>
19#include <functional>
20#include <optional>
21#include <system_error>
22#include <thread>
23#include <type_traits>
24
25#include "make_test_thread.h"
26#include "test_macros.h"
27
28int main(int, char**) {
29 // Effects: The thread represented by *this continues execution without the calling thread blocking.
30 {
31 std::atomic_bool start{false};
32 std::atomic_bool done{false};
33 std::optional<std::jthread> jt = support::make_test_jthread([&start, &done] {
34 start.wait(false);
35 done = true;
36 });
37
38 // If it blocks, it will deadlock here
39 jt->detach();
40
41 jt.reset();
42
43 // The other thread continues execution
44 start = true;
45 start.notify_all();
46 while (!done) {
47 }
48 }
49
50 // Postconditions: get_id() == id().
51 {
52 std::jthread jt = support::make_test_jthread([] {});
53 assert(jt.get_id() != std::jthread::id());
54 jt.detach();
55 assert(jt.get_id() == std::jthread::id());
56 }
57
58#if !defined(TEST_HAS_NO_EXCEPTIONS)
59 // Throws: system_error when an exception is required ([thread.req.exception]).
60 // invalid_argument - if the thread is not joinable.
61 {
62 std::jthread jt;
63 try {
64 jt.detach();
65 assert(false);
66 } catch (const std::system_error& err) {
67 assert(err.code() == std::errc::invalid_argument);
68 }
69 }
70#endif
71
72 std::this_thread::sleep_for(rtime: std::chrono::milliseconds{2});
73 return 0;
74}
75

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