https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118757
Bug ID: 118757
Summary: Waiting for stored pointer inside
std::atomic<std::shared_ptr<T>>
Product: gcc
Version: 14.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: fchelnokov at gmail dot com
Target Milestone: ---
According to https://devblogs.microsoft.com/oldnewthing/20250109-00/?p=110738
the following C++20 program
```
#include <memory>
#include <chrono>
#include <thread>
std::shared_ptr<int> q = std::make_shared<int>(42);
std::atomic<std::shared_ptr<int>> p = q;
void signaler()
{
std::this_thread::sleep_for(std::chrono::seconds(1));
p.store({ q, nullptr });
p.notify_one();
std::this_thread::sleep_for(std::chrono::seconds(1));
std::terminate();
}
int main(int, char**)
{
std::thread(signaler).detach();
p.wait(q);
return 0;
}
```
must finish gracefully by return 0; and not by std::terminate, because
p.wait(q) must stop immediately after p.store({ q, nullptr }); p.notify_one();
Online demo: https://gcc.godbolt.org/z/hqG5T8469
