whether ext() and atexit() are safe w.r.t each other

[Anoop <acv@xxxxxxxxxxxxxxxxxx>]

A race is observed between atexit() and exit() in Linux.

Does these functions need to be safe with respect to each other?

Being more specific, if a thread is registering a handler using atexit() while
exit() is processing the already registered handlers in the main thread,
what is the expected behavior as per the standard?

Cheers,
- Anoop

Linux Technology Center,
IBM.