收到的信号退出程序，但不调用信号处理程序

Question

问题

我的程序在主线程中运行之后，我发送一个signal.SIGINT信号来中断程序并导致退出。程序关闭，但是由于某种原因未调用信号处理程序，我需要调用信号处理程序来运行一些清理代码。

背景信息

我目前正在运行：
-Windows 10
-Python 3.7.3 x64

我尝试从内置信号模块发送多个不同的信号，例如SIGINT，SIGTERM和CTRL_C_EVENT。在所有情况下，程序流都将中断并退出程序，但是不会调用signal_handler。

我知道所有信号都只能由main函数接收，所以我试图在代码中坚持这一点。

代码

位置：
client =来自重写的不合格客户端对象
init_sanic（）=初始化sanic Web框架

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')

输出：

[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

用于发送信号的代码：

import os
import signal

os.kill(pid, signal.SIGINT)

最终输出：

Process finished with exit code 2

预期产量

代码按预期退出时，输出为：

[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

预期的最终输出是：

[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

感谢您的帮助！