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 main(int,char **)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(std::chrono::milliseconds{2}); 74 return 0; 75 } 76