[Bug libstdc++/101037] std::atomic_flag deadlock on Windows

[bjornsundin02 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101037

--- Comment #2 from Björn Sundin <bjornsundin02 at gmail dot com> ---
Created attachment 50987
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50987&action=edit
A short ping-pong example program.

The preprocessed file was too large so I attached the original C++ source
instead.