chapter3.5 如何杀掉一个进程

文中说到terminate会立即杀死进程，但是输出如下下方的图，在p.terminate()之后，输出进程p.is_alive()返回了True，也就是进程还活着，但是在p.join()之后，再次输出p进程的状态却死了，经过自己尝试，terminate确实会立即去杀死进程，但是在主进程执行到p.is_alive()的时候p尚未被杀死所以导致了返回了True。看文章的时候我以为是和后面的join有关，后面尝试在terminate之后执行time.sleep()，发现与join并无关联。具体代码如下：

import multiprocessing
from multiprocessing.dummy import Process
import time

def foo():
    print("Starting func")
    time.sleep(0.1)

if __name__ == "__main__":
    p  = multiprocessing.Process(target=foo)
    print("Process before excution:", p, p.is_alive())
    p.start()
    print("Process running :", p.is_alive())
    p.terminate()
    time.sleep(0.1) # 如果没有这一行，下面一行的代码可能会返回True
    print("Process terminated:" , p.is_alive()) # process is alive
    p.join()
    print("Process joined:", p.is_alive()) # process is dead

Start with the chapter 3.5 passage about multiprocessing.Process. Compare its explanation with the Python example in the issue, especially the timing of terminate(), is_alive(), and join(). The documentation is done when it accurately explains the observed state changes and no longer suggests that join() causes termination.