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 28 int 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(std::chrono::milliseconds{2}); 73 return 0; 74 } 75