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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
// This test uses std::atomic interfaces that are only available in C++20
// UNSUPPORTED: c++11, c++14, c++17
// Make sure that the `future` destructor keeps the data alive until the thread finished. This test fails by triggering
// TSan. It may not be observable by normal means.
// See https://github.com/llvm/llvm-project/pull/125433#issuecomment-2703618927 for more details.
#include <atomic>
#include <future>
#include <mutex>
#include <condition_variable>
#include <thread>
std::mutex mux;
int main(int, char**) {
std::condition_variable cond;
std::unique_lock lock(mux);
auto v = std::async(std::launch::async, [&cond, value = 1]() mutable {
std::unique_lock thread_lock(mux);
cond.notify_all();
thread_lock.unlock();
value = 4;
(void)value;
});
cond.wait(lock);
return 0;
}
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