多处理：如何将数据从父进程发送到持续运行的子进程？

Question

Is it possible to use multiprocessing to send data to a running child process? For example, running a web server in a child process and using the parent process to send data to the server. I found this question about the exact reverse of my situation (ie continuous updates from a running child process back to the parent). Is there a way to get this to work? My understanding is that multiprocessing.Queue only sends/receives data on process termination. This pseudocode gives a skeleton of what I'd like to do:

def server(q):
    //start eventlet server
    q.get() // --> does something

q = Queue()
p = Process(target=server, args=(q,))
p.start()
q.put("some kind of command")

Answer 1

I think you misread the answer you quoted. The multiprocessing.Queue was designed for exactly the purpose you describe. Maybe check out the reference documentation for that class? An alternative may also be multiprocessing.Pipe .

Answer 2

Your pseudocode runs almost exactly as written:

from multiprocessing import Queue, Process
import time

def server(q):
    while True:
        stuff = q.get()
        print(stuff, flush=True)

if __name__ == '__main__':
    q = Queue()
    p = Process(target=server, args=(q,))
    p.start()
    for i in range(5):
        q.put(i)
        time.sleep(1)
    p.terminate()