python_多线程

1.多线程的实现与阻塞

import time
import threading

def fun_yellow(num):
    for i in range(1,num+1):
        print('正在拿第：'+str(i)+"个黄苹果，当前时间："+time.ctime()+'\n')
        time.sleep(1)

def fun_red(num):
    for i in range(1,num+1):
        print('正在拿第：'+str(i)+"个红苹果，当前时间："+time.ctime()+'\n')
        time.sleep(1)

thread_yellow=threading.Thread(target=fun_yellow,args=(5,))
thread_yellow.start()

thread_red=threading.Thread(target=fun_red,args=(5,))
thread_red.start()

#阻塞主线程
thread_yellow.join()
thread_red.join()
print('所有任务都已执行完成！')

2.多线程同步：

import time
import threading

all_num=0
lock=threading.Lock()

def fun_li(num):
    global all_num
    global lock

    #加锁
    lock.acquire()
    for i in range(1,num+1):
        all_num+=1
        print('李正在放第：'+str(i)+'个苹果，当前总共有：'+str(all_num)+'个苹果，当前时间：'+time.ctime()+'\n')
        time.sleep(1)
    #解锁
    lock.release()

def fun_zhang(num):
    global all_num
    global lock

    lock.acquire()
    for i in range(1,num+1):
        all_num+=1
        print('张正在放第：'+str(i)+'个苹果，当前总共有：'+str(all_num)+'个苹果，当前时间：'+time.ctime()+'\n')
        time.sleep(1)
    lock.release()

thread_yellow=threading.Thread(target=fun_li,args=(5,))
thread_yellow.start()

thread_red=threading.Thread(target=fun_zhang,args=(5,))
thread_red.start()

#阻塞主线程
thread_yellow.join()
thread_red.join()
print('所有任务都已执行完成！')