python 多进程不能总是捕捉信号（ctrl+c）

这是运行进程池的示例，其中提交的每个任务都运行一个线程，该线程除了休眠 5 秒之外不做注意。一旦我确定 SIGINT 处理程序已经设置，我就输入 CTRL-C。一旦 sleep 完成，就会输出“接收信号”消息：

import signal
from multiprocessing import Pool
from threading import Thread

def signal_handler(signum,framE):
    print(f'receive signal: {signum}')

def set_handler():
    signal.signal(signal.SIGINT,signal_handler)
    print('handler set')

def delay():
    import time
    time.sleep(5)

def worker(X):
    t = Thread(target=delay)
    t.start()
    t.join()
    return x ** 2

def main():
    set_handler()
    # initialize each process in the pool with the handler: 
    pool = Pool(2,initializer=set_handler)
    print(pool.map(worker,(1,2)))

if __name__ == '__main__':
    main()

以下是使用 Process 实例和多个线程而不是进程池的示例：

import signal
from multiprocessing import Process
from threading import Thread

def signal_handler(signum,signal_handler)
    print('handler set')

def delay():
    import time
    time.sleep(5)

def worker(X):
    set_handler()
    threads = [Thread(target=delay) for _ in range(5)]
    for t in threads:
        t.start()
    for t in threads:
        t.join()
    print(x ** 2)

def main():
    set_handler()
    procs = [Process(target=worker,args=(i,)) for i in range(1,9)]
    for p in procs:
        p.start()
    for p in procs:
        p.join()

if __name__ == '__main__':
    main()