How to correctly use std::atomic_signal_fence()?

Question

cppreference.com documents this function as \"fence between a thread and a signal handler executed in the same thread\". But I found no example on the Internet.

I wonder

Answer 1

In your example, you want to use std::atomic_thread_fence (which generates machine code to perform thread synchronization); not std::atomic_signal_fence (which only disables compiler memory reordering optimizations on atomic variables). As was said by others, std::atomic_signal_fence is only intended for signals on the same thread as the atomic operations (I believe it would also hold true for structured/vectored exception handlers on Windows, but don't quote me on that).