Question

我正在尝试在python Daemon（）上下文中使用concurrent.futures ProcessPool执行程序（ThreadPool正在运行），并且每个提交的任务都处于运行状态。

import concurrent.futures
import time
import daemon
import sys

class Daemon():

    def __init__(self):

        print("init")

        self.context = daemon.DaemonContext(
                stdout = sys.stdout
                )

        with self.context:

            self.__run()

    def task(self, n):

        start = time.time()
        time.sleep(n)
        duration = time.time() - start

        return n, duration


    def __run(self):

        try:

            #e = concurrent.futures.ThreadPoolExecutor(3)
            e = concurrent.futures.ProcessPoolExecutor(3)
            fut = e.submit(self.task, 2)

            while not fut.done():

                print(fut)
                time.sleep(0.5)

            res = fut.result()
            print(res)

            e.shutdown(wait=True)

        except Exception as e:

            print(e)

        finally:

            print("stopped")


if __name__ == '__main__':

    Daemon()

输出：

# venv/bin/python conc.py
init
<Future at 0x7f85195c8588 state=running>
<Future at 0x7f85195c8588 state=running>
<Future at 0x7f85195c8588 state=running>
[...]

当ThreadPoolExecutor在2秒后正确停止时：

<Future at 0x7f38fd450668 state=running>
<Future at 0x7f38fd450668 state=running>
(30, 2.002039670944214)
stopping

由于并发代码在没有守护进程的情况下运行，我想知道我在这里做错了什么。

我正在使用python 3.5.3和python-daemon 2.1.2

Python 3在守护进程上下文中使用并发期货ProcessPool

0 个答案: