import threading
import sys
import time
def showa():
while True:
lockc.acquire() #获取对方的锁，释放自己的锁
print('a',end='')
sys.stdout.flush() #释放缓冲区
locka.release()
time.sleep(0.2)
def showb():
while True:
locka.acquire()
print('b',end='')
sys.stdout.flush()
lockb.release()
time.sleep(0.2)
def showc():
while True:
lockb.acquire()
print('c',end='')
sys.stdout.flush()
lockc.release()
time.sleep(0.2)
if __name__=='__main__':
locka=threading.Lock() #定义3个互斥锁
lockb=threading.Lock()
lockc=threading.Lock() t1=threading.Thread(target=showa) #定义3个线程
t2=threading.Thread(target=showb)
t3=threading.Thread(target=showc) locka.acquire() #先锁住a,b锁，保证先打印a
lockb.acquire() t1.start()
t2.start()
t3.start() 执行结果：abcabcabcabcabcabcabcabcabcabcbabcabcabcabcabcabc.......
关于线程池，进程池参考如下链接：http://c.biancheng.net/view/2627.html
