1.2Python多进程方法之join

#encoding:utf-8
from multiprocessing import Process
import os, time, random

def r1(process_name):
    for i in range(5):
        print(f'{process_name} {os.getpid()}')     #打印出当前进程的id
        time.sleep(1)
def r2(process_name):
    for i in range(5):
        print(f'{process_name} {os.getpid()}')     #打印出当前进程的id
        time.sleep(1.2)

if __name__ == "__main__":
        print("main process run...")
        p1 = Process(target=r1, args=('process_name1', )) 
        p2 = Process(target=r2, args=('process_name2', )) 
        #所以使用多进程的常规方法是，先依次调用start启动进程，再依次调用join要求主进程等待子进程的结束。
        p1.start()
        p2.start()
        p1.join()   #join() : 阻塞当前进程，直到调用join方法的那个进程执行完，再继续执行当前进程。
        #p2.join()    
        print("main process runned all lines...")