Signal only works in main thread

[weullerk]

Hi,

I'm using a lib to rect pack and it uses this library, and I have a error about the signal only running on main thread.

[weullerk]

A guy on the python forum give a comment about the situation:

flask responds to requests concurrently using threads
They are using a signal handler to respond gracefully to ctrl+c KeyboardInterrupt
But that doesn't work in an off-main-thread
So they need to do something different when run in an off-main thread, eg no-op the SIGINT handling with a:

try: signal.signal(...) except ValueError: if threading.current_thread() is threading.main_thread(): raise

I particulary resolved the error using the multithread Process class as suggested by graingert on python discord.

[graingert]

The multiprocessing.Process class not multithreading