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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: no-threads
// UNSUPPORTED: c++03, c++11, c++14, c++17
// XFAIL: availability-synchronization_library-missing
// ~jthread();
#include <atomic>
#include <cassert>
#include <optional>
#include <stop_token>
#include <thread>
#include <type_traits>
#include <vector>
#include "make_test_thread.h"
#include "test_macros.h"
int main(int, char**) {
// !joinable()
{
std::jthread jt;
assert(!jt.joinable());
}
// If joinable() is true, calls request_stop() and then join().
// request_stop is called
{
std::optional<std::jthread> jt = support::make_test_jthread([] {});
bool called = false;
std::stop_callback cb(jt->get_stop_token(), [&called] { called = true; });
jt.reset();
assert(called);
}
// If joinable() is true, calls request_stop() and then join().
// join is called
{
std::atomic_int calledTimes = 0;
std::vector<std::jthread> jts;
constexpr auto numberOfThreads = 10u;
jts.reserve(numberOfThreads);
for (auto i = 0u; i < numberOfThreads; ++i) {
jts.emplace_back(support::make_test_jthread([&calledTimes] {
std::this_thread::sleep_for(std::chrono::milliseconds{2});
calledTimes.fetch_add(1, std::memory_order_relaxed);
}));
}
jts.clear();
// If join was called as expected, calledTimes must equal to numberOfThreads
// If join was not called, there is a chance that the check below happened
// before test threads incrementing the counter, thus calledTimed would
// be less than numberOfThreads.
// This is not going to catch issues 100%. Creating more threads would increase
// the probability of catching the issue
assert(calledTimes.load(std::memory_order_relaxed) == numberOfThreads);
}
return 0;
}
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