How do you safely handle SIGTERM in multi-threaded Python services?

import signal, threading, time

shutdown = threading.Event()

def handler(sig, frame): shutdown.set()

signal.signal(signal.SIGTERM, handler)

def worker(i):
    while not shutdown.wait(0.1):  # Poll 10x/sec
        time.sleep(0.01)  # Work
    print(f"Worker {i} done")

threads = [threading.Thread(target=worker, args=(i,), daemon=True) 
           for i in range(4)]
for t in threads: t.start()
for t in threads: t.join(5)  # 5s max