实现一个线程不断生成一个随机数到一个队列中(考虑使用Queue这个模块) 实现一个线程从上面的队列里面不断的取出奇数 实现另外一个线程从上面的队列里面不断取出偶数 Python中使用线程有两种方式：函数或者用类来包装线程对象。 函数式：调用thread模块中的start_new_thread()函数来产生新线程。或者创建threading.Thread的子类来包装一个线程对象。 此处采用第二种方式，即创建自己的线程类，必要时重写threading.Thread类的方法，线程的控制可以由自己定制。 最简单的同步机制就是“锁”。锁对象由threading.RLock类创建。 锁只能提供最基本的同步。假如只在发生某些事件时才访问一个“临界区”，这时需要使用条件变量Condition。Python中Queue对象也提供对线程的同步支持。在此次实践中就是使用queue对象实现一个生产者和两个消费者形成的FIFO的队列。生产者将数据依次存入队列，消费者从队列取出数据。
#!/usr/bin/env python
#coding:utf8
import random,threading,time
from Queue import Queue
#Producer thread
class Producer(threading.Thread):
def __init__(self, t_name, queue):
threading.Thread.__init__(self,name=t_name)
self.data=queue
def run(self):
for i in range(10): #随机产生10个数字 ，可以修改为任意大小
randomnum=random.randint(1,99)
print "%s: %s is producing %d to the queue!" % (time.ctime(), self.getName(), randomnum)
self.data.put(randomnum) #将数据依次存入队列
time.sleep(1)
print "%s: %s finished!" %(time.ctime(), self.getName())
#Consumer thread
class Consumer_even(threading.Thread):
def __init__(self,t_name,queue):
threading.Thread.__init__(self,name=t_name)
self.data=queue
def run(self):
while 1:
try:
val_even = self.data.get(1,5) #get(self, block=True, timeout=None) ,1就是阻塞等待,5是超时5秒
if val_even%2==0:
print "%s: %s is consuming. %d in the queue is consumed!" % (time.ctime(),self.getName(),val_even)
time.sleep(2)
else:
self.data.put(val_even)
time.sleep(2)
except: #等待输入，超过5秒 就报异常
print "%s: %s finished!" %(time.ctime(),self.getName())
break
class Consumer_odd(threading.Thread):
def __init__(self,t_name,queue):
threading.Thread.__init__(self, name=t_name)
self.data=queue
def run(self):
while 1:
try:
val_odd = self.data.get(1,5)
if val_odd%2!=0:
print "%s: %s is consuming. %d in the queue is consumed!" % (time.ctime(), self.getName(), val_odd)
time.sleep(2)
else:
self.data.put(val_odd)
time.sleep(2)
except:
print "%s: %s finished!" % (time.ctime(), self.getName())
break
#Main thread
def main():
queue = Queue()
producer = Producer('Pro.', queue)
consumer_even = Consumer_even('Con_even.', queue)
consumer_odd = Consumer_odd('Con_odd.',queue)
producer.start()
consumer_even.start()
consumer_odd.start()
producer.join()
consumer_even.join()
consumer_odd.join()
print 'All threads terminate!'
if __name__ == '__main__':
main()
输出结果 Sun Jun 16 21:03:52 2013: Pro. is producing 71 to the queue! Sun Jun 16 21:03:52 2013: Con_odd. is consuming. 71 in the queue is consumed! Sun Jun 16 21:03:53 2013: Pro. is producing 24 to the queue! Sun Jun 16 21:03:54 2013: Pro. is producing 80 to the queue! Sun Jun 16 21:03:54 2013: Con_even. is consuming. 24 in the queue is consumed! Sun Jun 16 21:03:55 2013: Pro. is producing 94 to the queue! Sun Jun 16 21:03:56 2013: Con_even. is consuming. 94 in the queue is consumed! Sun Jun 16 21:03:56 2013: Pro. is producing 19 to the queue! Sun Jun 16 21:03:57 2013: Pro. is producing 88 to the queue! Sun Jun 16 21:03:58 2013: Pro. is producing 16 to the queue! Sun Jun 16 21:03:59 2013: Pro. is producing 70 to the queue! Sun Jun 16 21:04:00 2013: Con_even. is consuming. 80 in the queue is consumed! Sun Jun 16 21:04:00 2013: Pro. is producing 58 to the queue! Sun Jun 16 21:04:01 2013: Pro. is producing 2 to the queue! Sun Jun 16 21:04:02 2013: Con_odd. is consuming. 19 in the queue is consumed! Sun Jun 16 21:04:02 2013: Con_even. is consuming. 16 in the queue is consumed! Sun Jun 16 21:04:02 2013: Pro. finished! Sun Jun 16 21:04:04 2013: Con_even. is consuming. 88 in the queue is consumed! Sun Jun 16 21:04:06 2013: Con_even. is consuming. 2 in the queue is consumed! Sun Jun 16 21:04:08 2013: Con_even. is consuming. 58 in the queue is consumed! Sun Jun 16 21:04:10 2013: Con_even. is consuming. 70 in the queue is consumed! Sun Jun 16 21:04:17 2013: Con_odd. finished! Sun Jun 16 21:04:17 2013: Con_even. finished! All threads terminate! 转载请保留固定链接： https://linuxeye.com/program/1766.html |