在 Python 中通过 multiprocessing.Pipe() 发送和接收异步

Question

我在让 Pipe.send 在此代码中工作时遇到了一些问题。我最终想做的是在外部进程在分叉中运行时向外部进程发送和接收消息。这最终将被集成到与解释器进程对话的 pexpect 循环中。

from multiprocessing import Process, Pipe
from pexpect import spawn


class CockProc(Process):

    def start(self):
        self.process = spawn('coqtop', ['-emacs-U'])

    def run(self, conn):
        while True:
            if not conn.poll():
                cmd = conn.recv()
                self.process.send(cmd)
            self.process.expect('\<\/prompt\>')
            result = self.process.before + self.process.after + " "
            conn.send(result)


q, p = Pipe()

proc = CockProc()
proc.start()
proc.run(p)
res = q.recv()
command = raw_input(res + " ")

q.send(command)
res = q.recv()
parent_conn.send('OHHAI')
p.join()
    `

Answer 1

这可行，但可能需要更多工作。不确定我可以创建和循环其中的多少。

from multiprocessing import Process, Pipe
from pexpect import spawn


class CockProc(Process):

    def start(self):
        self.process = spawn('coqtop', ['-emacs-U'])

    def run(self, conn):
        if conn.poll():
            cmd = conn.recv()
            self.process.send(cmd + "\n")
            print "sent comm"
        self.process.expect('\<\/prompt\>')
        result = self.process.before + self.process.after + " "
        conn.send(result)

here, there = Pipe(duplex=True)

proc = CockProc()
proc.start()
proc.run(there)

while True:
    if here.poll():
        res = here.recv()
        command = raw_input(res + " ")
        here.send(command)
    proc.run(there)