python3 多进程

code

macname@MacdeMBP Desktop % 
macname@MacdeMBP Desktop % cat test.py 
import time
from multiprocessing import Process

def func(name):
    print(f"我是{name}开始")
    time.sleep(0.5)
    print(f"我是{name}结束")


if __name__ == '__main__':
    p1 = Process(target=func, args=("进程1",))
    p1.start()

    print("主进程执行结束，子进程是依附于主进程存在的，所以，子进程都结束后，主进程才真正的结束。")

macname@MacdeMBP Desktop % python3 test.py 
主进程执行结束，子进程是依附于主进程存在的，所以，子进程都结束后，主进程才真正的结束。
我是进程1开始
我是进程1结束

 code2

import multiprocessing
from multiprocessing import Pool
import time
import threading

g_num = 0
def test1():
    global g_num
    for i in range(10):
        g_num += 1
def test2():
    print(g_num)
if __name__ == '__main__':
    p1 = multiprocessing.Process(target=test1)
    p2 = multiprocessing.Process(target=test2)
    p1.start()
    p1.join()
    p2.start()
    print("main")

 code3

import multiprocessing
from multiprocessing import Pool
import time
def test1():
    for i in range(10):
        time.sleep(1)
        print('test', i)
 
def test2():
    for i in range(10):
        time.sleep(1)
        print('test', i)
 
if __name__ == '__main__':
    p1 = multiprocessing.Process(target=test1)
    p2 = multiprocessing.Process(target=test2)
    p1.start()
    p2.start()
    print("main")