code

import multiprocessing
from multiprocessing import Pool
import time
import threading


g_num = 0
def test1():
    for i in range(10):
        time.sleep(1)
        print('test1',i)
def test2():
    for i in range(10):
        time.sleep(1)
        print('test2',i)
 
if __name__ == '__main__':
    pool = Pool(2)    # 允许进程池里同时放入2个进程 其他多余的进程处于挂起状态
    pool.apply_async(test1)      
    pool.apply_async(test2)
    pool.close()  # close() 必须在join()前被调用
    pool.join()    # 进程池中进程执行完毕后再关闭，如果注释，那么程序直接关闭。
    print("main")