1、线程模式代码
#!/usr/bin/python
#_*_coding:utf-8_*_
import threading
import time
def Producer():
print 'chef : 等人来买包子。。。'
event.wait()
event.clear()
print 'sb is coning for baozi...'
print 'chef : making a baozi for sb...'
time.sleep(3)
print 'chef : 你的包子好了'
event.set()
def Consumer():
print 'maxi : 去买包子'
event.set()
time.sleep(1)
print 'maxi : waiting for baozi tobe readly'
event.wait()
print '哎呀,真好吃'
event = threading.Event()
p = threading.Thread(target=Producer)
c = threading.Thread(target=Consumer)
p.start()
c.start()
运行结果:
2、怎样调用自己的线程类
代码如下:
#!/usr/bin/python
#_*_coding:utf-8_*_
from threading import Thread
import time
class MyThread(Thread): #调用我自己的线程方法前,必须先调用父类的run()方法;
def run(self):
print 'myThread'
#Thread.run(self) #启用父类的run(),只有这样才能调用自己的线程函数
super(MyThread, self).run()
def Bar():
print 'bar',
t1 = MyThread(target = Bar) #我的线程方法Bar()函数;
t1.start()
print 'over'
运行结果:
3、线程安全
代码如下:
#!/usr/bin/python
#_*_coding:utf-8_*_
import threading
import time
num = 0
def run(n):
time.sleep(1)
samp.acquire() #锁上
global num
num += 1
print '%d\n' % num
samp.release() #释放锁
#lock = threading.Lock() #锁机制,
samp = threading.BoundedSemaphore(4) #信号量
for i in range(1000):
t = threading.Thread(target = run, args = (i,))
t.start()
因为上面给了4个信号量,就是可以同时最多有4个进程抢占资源;
运行结果:
当我们把信号量改为1时,就相当于独占,此时结果肯定就是1000了;