| // { dg-do run { target c++20 } } |
| // { dg-additional-options "-pthread" { target pthread } } |
| // { dg-require-gthreads "" } |
| // { dg-require-effective-target hosted } |
| |
| #include <memory> |
| #include <chrono> |
| #include <thread> |
| #include <barrier> |
| |
| std::shared_ptr<int> s = std::make_shared<int>(42); |
| std::weak_ptr<int> q = s; |
| std::atomic<std::weak_ptr<int>> p = q; |
| |
| std::barrier bar(2); |
| |
| void signaller() |
| { |
| std::this_thread::sleep_for(std::chrono::seconds(1)); |
| p.store(std::shared_ptr<int>(s, nullptr)); |
| p.notify_one(); |
| bar.arrive_and_wait(); |
| } |
| |
| int main(int, char**) |
| { |
| std::thread thr(signaller); |
| p.wait(q); |
| bar.arrive_and_wait(); |
| thr.join(); |
| } |
