74 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8//9// UNSUPPORTED: no-threads10// UNSUPPORTED: c++03, c++11, c++14, c++1711 12// void detach();13 14#include <atomic>15#include <cassert>16#include <chrono>17#include <concepts>18#include <functional>19#include <optional>20#include <system_error>21#include <thread>22#include <type_traits>23 24#include "make_test_thread.h"25#include "test_macros.h"26 27int main(int, char**) {28 // Effects: The thread represented by *this continues execution without the calling thread blocking.29 {30 std::atomic_bool start{false};31 std::atomic_bool done{false};32 std::optional<std::jthread> jt = support::make_test_jthread([&start, &done] {33 start.wait(false);34 done = true;35 });36 37 // If it blocks, it will deadlock here38 jt->detach();39 40 jt.reset();41 42 // The other thread continues execution43 start = true;44 start.notify_all();45 while (!done) {46 }47 }48 49 // Postconditions: get_id() == id().50 {51 std::jthread jt = support::make_test_jthread([] {});52 assert(jt.get_id() != std::jthread::id());53 jt.detach();54 assert(jt.get_id() == std::jthread::id());55 }56 57#if !defined(TEST_HAS_NO_EXCEPTIONS)58 // Throws: system_error when an exception is required ([thread.req.exception]).59 // invalid_argument - if the thread is not joinable.60 {61 std::jthread jt;62 try {63 jt.detach();64 assert(false);65 } catch (const std::system_error& err) {66 assert(err.code() == std::errc::invalid_argument);67 }68 }69#endif70 71 std::this_thread::sleep_for(std::chrono::milliseconds{2});72 return 0;73}74