received signal exits program but does not call signal handler - python-3.x

Question

Problem
After my program runs within the main thread, I send a signal.SIGINT signal to interrupt the program and cause an exit to occur. The program shuts down, however the signal handler is not called for some reason, I need the signal handler to call to run some cleanup code.
Background Info
Currently I'm running on:
- Windows 10
- Python 3.7.3 x64
I've tried sending multiple different signals such as SIGINT, SIGTERM and CTRL_C_EVENT from the builtin signals module. In all cases, the program flow is interrupted and the program exits, however the signal_handler is not called.
I'm aware that all signals are only received by the main function, so that is something I have tried to adhere to within the code.
Code
Where:
client = discordpy client object from the rewrite
init_sanic() = initialises the sanic web framework
class ForcedShutdown(Exception):
"""
Custom exception to be raised
"""
pass
def signal_handler(signal, frame):
print(f'signal received is {signal}')
raise ForcedShutdown
if(__name__ == '__main__'):
try:
signal.signal(signal.SIGINT, signal_handler)
client = DiscordBot()
bot_thread = Thread(target=lambda : client.run(setup_pars['CLIENT_TOKEN']))
api_thread = Thread(target=lambda : init_sanic())
threads = [api_thread, bot_thread]
for x in threads:
x.start()
while True:
time.sleep(100)
except (ForcedShutdown, SystemExit):
print('DO SHUTDOWN ACTIONS')
The output:
[2019-07-31 19:49:18 +0100] [11808] [DEBUG]
Sanic
Build Fast. Run Fast.
[2019-07-31 19:49:18 +0100] [11808] [INFO] Goin' Fast # http://0.0.0.0:8000
[2019-07-31 19:49:18 +0100] [11808] [WARNING] Sanic tried to use loop.add_signal_handler but it is not implemented on this platform.
[2019-07-31 19:49:18 +0100] [11808] [WARNING] Sanic tried to use loop.add_signal_handler but it is not implemented on this platform.
[2019-07-31 19:49:18 +0100] [11808] [INFO] Starting worker [11808]
Discord Bot Loaded
Code used to send the signal:
import os
import signal
os.kill(pid, signal.SIGINT)
Final output:
Process finished with exit code 2
Expected Output
While the code exits as expected, the outputs is:
[2019-07-31 19:49:18 +0100] [11808] [DEBUG]
Sanic
Build Fast. Run Fast.
[2019-07-31 19:49:18 +0100] [11808] [INFO] Goin' Fast # http://0.0.0.0:8000
[2019-07-31 19:49:18 +0100] [11808] [WARNING] Sanic tried to use loop.add_signal_handler but it is not implemented on this platform.
[2019-07-31 19:49:18 +0100] [11808] [WARNING] Sanic tried to use loop.add_signal_handler but it is not implemented on this platform.
[2019-07-31 19:49:18 +0100] [11808] [INFO] Starting worker [11808]
Discord Bot Loaded
Process finished with exit code 2
Whereas the expected final output is:
[2019-07-31 19:49:18 +0100] [11808] [DEBUG]
Sanic
Build Fast. Run Fast.
[2019-07-31 19:49:18 +0100] [11808] [INFO] Goin' Fast # http://0.0.0.0:8000
[2019-07-31 19:49:18 +0100] [11808] [WARNING] Sanic tried to use loop.add_signal_handler but it is not implemented on this platform.
[2019-07-31 19:49:18 +0100] [11808] [WARNING] Sanic tried to use loop.add_signal_handler but it is not implemented on this platform.
[2019-07-31 19:49:18 +0100] [11808] [INFO] Starting worker [11808]
Discord Bot Loaded
DO SHUTDOWN ACTIONS
Process finished with exit code 2
Thanks for any help!