Why can not reach the harakiri signal handler?

[Liubey]

My config:

harakiri = 10
harakiri-graceful-timeout = 3
harakiri-graceful-signal= 1

the wsgi.py:

def signal_handler(signum, frame):
    print("[Python App] attempting graceful shutdown")



print('try to post form harakiri')
signal.signal(signal.SIGHUP, handler=signal_handler)
print('try to post form harakiri end')

When the project start:

When I sleep on api:

But , I can not find the handler have already run. I can not find the print log.

Where did I miss?

[Liubey]

Use this demo: https://github.com/nzjs/experiments-harakiri/tree/nzjs/update-uwsgi

And also no log when graceful shutdown. I'm running it on my Mac.

What can I do?

INFO 2024-12-19 02:01:12,576 middleware 35705 8449183552 signal handlers: <bound method HarakiriLoggerMiddleware.handle_signal of <class 'harakiri.middleware.HarakiriLoggerMiddleware'>>
INFO 2024-12-19 02:01:12,581 views 35705 8449183552 REQUEST: slow
Thu Dec 19 10:01:17 2024 - *** HARAKIRI ON WORKER 2 (pid: 35705, try: 1, graceful: yes) ***
Thu Dec 19 10:01:17 2024 - HARAKIRI !!! worker 2 status !!!
Thu Dec 19 10:01:17 2024 - HARAKIRI [core 0] 127.0.0.1 - GET /slow/ since 1734573672
Thu Dec 19 10:01:17 2024 - HARAKIRI !!! end of worker 2 status !!!
Thu Dec 19 10:01:17 2024 - HARAKIRI: graceful termination attempt on worker 2 with signal 1. Next harakiri: 1734573680
Thu Dec 19 10:01:17 2024 - HARAKIRI triggered by worker 2 core 0 !!!
Gracefully killing worker 2 (pid: 35705)...
Thu Dec 19 10:01:20 2024 - *** HARAKIRI ON WORKER 2 (pid: 35705, try: 2, graceful: no) ***
Thu Dec 19 10:01:20 2024 - HARAKIRI !!! worker 2 status !!!
Thu Dec 19 10:01:20 2024 - HARAKIRI [core 0] 127.0.0.1 - GET /slow/ since 1734573672
Thu Dec 19 10:01:20 2024 - HARAKIRI !!! end of worker 2 status !!!
Thu Dec 19 10:01:20 2024 - HARAKIRI: graceful termination attempt on worker 2 with signal 1. Next harakiri: 1734573683
Thu Dec 19 10:01:20 2024 - HARAKIRI triggered by worker 2 core 0 !!!

[Liubey]

Maybe it depends on Python'version?
On my project, python version=3.7, not work.
On another demo, python version=3.11, It's work.