python-Lock锁线程同步和互斥

 #!/usr/bin/python
#coding=utf-8
#线程间通信的同步与互斥操作－锁
import threading
a=b=0
lock=threading.Lock()
def value():
    while 1:
        lock.acquire()
        if a!=b:
            print "a=%d,b=%d"%(a,b)
        lock.release()
t=threading.Thread(target=value)
t.start()
while True:
    lock.acquire()
    a+=1
    b+=1
    lock.release()