| 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 | // ~jthread(); |
|---|
| 14 | |
|---|
| 15 | #include <atomic> |
|---|
| 16 | #include <cassert> |
|---|
| 17 | #include <optional> |
|---|
| 18 | #include <stop_token> |
|---|
| 19 | #include <thread> |
|---|
| 20 | #include <type_traits> |
|---|
| 21 | #include <vector> |
|---|
| 22 | |
|---|
| 23 | #include "make_test_thread.h" |
|---|
| 24 | #include "test_macros.h" |
|---|
| 25 | |
|---|
| 26 | int main(int, char**) { |
|---|
| 27 | // !joinable() |
|---|
| 28 | { |
|---|
| 29 | std::jthread jt; |
|---|
| 30 | assert(!jt.joinable()); |
|---|
| 31 | } |
|---|
| 32 | |
|---|
| 33 | // If joinable() is true, calls request_stop() and then join(). |
|---|
| 34 | // request_stop is called |
|---|
| 35 | { |
|---|
| 36 | std::optional<std::jthread> jt = support::make_test_jthread([] {}); |
|---|
| 37 | bool called = false; |
|---|
| 38 | std::stop_callback cb(jt->get_stop_token(), [&called] { called = true; }); |
|---|
| 39 | jt.reset(); |
|---|
| 40 | assert(called); |
|---|
| 41 | } |
|---|
| 42 | |
|---|
| 43 | // If joinable() is true, calls request_stop() and then join(). |
|---|
| 44 | // join is called |
|---|
| 45 | { |
|---|
| 46 | std::atomic_int calledTimes = 0; |
|---|
| 47 | std::vector<std::jthread> jts; |
|---|
| 48 | |
|---|
| 49 | constexpr auto numberOfThreads = 10u; |
|---|
| 50 | jts.reserve(numberOfThreads); |
|---|
| 51 | for (auto i = 0u; i < numberOfThreads; ++i) { |
|---|
| 52 | jts.emplace_back(support::make_test_jthread([&calledTimes] { |
|---|
| 53 | std::this_thread::sleep_for(std::chrono::milliseconds{2}); |
|---|
| 54 | calledTimes.fetch_add(1, std::memory_order_relaxed); |
|---|
| 55 | })); |
|---|
| 56 | } |
|---|
| 57 | jts.clear(); |
|---|
| 58 | |
|---|
| 59 | // If join was called as expected, calledTimes must equal to numberOfThreads |
|---|
| 60 | // If join was not called, there is a chance that the check below happened |
|---|
| 61 | // before test threads incrementing the counter, thus calledTimed would |
|---|
| 62 | // be less than numberOfThreads. |
|---|
| 63 | // This is not going to catch issues 100%. Creating more threads would increase |
|---|
| 64 | // the probability of catching the issue |
|---|
| 65 | assert(calledTimes.load(std::memory_order_relaxed) == numberOfThreads); |
|---|
| 66 | } |
|---|
| 67 | |
|---|
| 68 | return 0; |
|---|
| 69 | } |
|---|
| 70 | |
|---|
