python多处理设置生成过程等待

问题描述

是否可以生成某些进程并将生成进程设置为等到生成进程完成?贝娄是我使用的一个例子.

Is it possible to spawn some processes and set the spawning process to wait until the spawned processes finish? Bellow is an example I have used.

import multiprocessing
import time
import sys

def daemon():
    p = multiprocessing.current_process()
    print 'Starting:', p.name, p.pid
    sys.stdout.flush()
    time.sleep(2)
    print 'Exiting :', p.name, p.pid
    sys.stdout.flush()

def non_daemon():
    p = multiprocessing.current_process()
    print 'Starting:', p.name, p.pid
    sys.stdout.flush()
    print 'Exiting :', p.name, p.pid
    sys.stdout.flush()

if __name__ == '__main__':
    d = multiprocessing.Process(name='daemon', target=daemon)
    d.daemon = True

    n = multiprocessing.Process(name='non-daemon', target=non_daemon)
    n.daemon = False

    print "start main"
    d.start()
    time.sleep(1)
    n.start()
    print "stop main"

将打印

start main
Starting: daemon 2809
stop main
Starting: non-daemon 2810
Exiting : non-daemon 2810

我想拥有:

start main
messages from other services
stop main

推荐答案

d.join()将阻塞主线程，直到d完成.因此，要获得所需的打印语句的顺序，请将join s放在print "stop main"之前:

d.join()will block the main thread until d finishes.So, to get the order of print statements you desire, put the joins before print "stop main":

print "start main"
d.start()
time.sleep(1)
n.start()
d.join()
n.join()
print "stop main"

这篇关于python多处理设置生成过程等待的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！