On 12Apr.2019 0919, Jeroen Demeyer wrote:
The signal handler (that receives signals from the OS) in Python starts with a check
if (getpid() == main_pid)
Looking at the comments, the intent was to do a check for the main *thread* but this is checking the *process* id. So this condition is basically always true. Therefore, I suggest to remove it in https://bugs.python.org/issue36601
If you have any objections or comments, I suggest to post them to that bpo.
To add a little more context, the check was added about 25 years ago as a "hack" for some reason that we can't figure out anymore. So if you are a historian of ancient operating systems and know of one that might have raised signal handlers in a different process from the one where it was registered, we'd love to hear from you. Cheers, Steve