Python3生产者/消费者模式
import threading
import queue,time,random
class Goods:#产品类
def __init__(self):
self.count = 0
def add(self,num = 1):
self.count += num
def sub(self):
if self.count>=0:
self.count -= 1
def empty(self):
return self.count <= 0
class Producer(threading.Thread):#生产者类
def __init__(self,condition,goods,sleeptime = 1):#sleeptime=1
threading.Thread.__init__(self)
self.cond = condition
self.goods = goods
self.sleeptime = sleeptime
def run(self):
cond = self.cond
goods = self.goods
while True:
cond.acquire()#锁住资源
goods.add()
print("产品数量:",goods.count,"生产者线程")
cond.notifyAll()#唤醒所有等待的线程--》其实就是唤醒消费者进程
cond.release()#解锁资源
time.sleep(self.sleeptime)
class Consumer(threading.Thread):#消费者类
def __init__(self,condition,goods,sleeptime = 2):#sleeptime=2
threading.Thread.__init__(self)
self.cond = condition
self.goods = goods
self.sleeptime = sleeptime
def run(self):
cond = self.cond
goods = self.goods
while True:
time.sleep(self.sleeptime)
cond.acquire()#锁住资源
while goods.empty():#如无产品则让线程等待
cond.wait()
goods.sub()
print("产品数量:",goods.count,"消费者线程")
cond.release()#解锁资源
g = Goods()
c = threading.Condition()
pro = Producer(c,g)
pro.start()
con = Consumer(c,g)
con.start()
Python的锁
import threading
import time
private_lock = threading.RLock()
num = 0
class MyThread(threading.Thread):
def __init__(self, name):
threading.Thread.__init__(self)
self.t_name = name
def run(self):
global num
while True:
private_lock.acquire()
if num > 4:
print("%s" % self.t_name)
time.sleep(5)
private_lock.release()
break
num += 1
private_lock.release()
def test1():
thread1 = MyThread('A')
thread2 = MyThread('B')
thread1.start()
thread2.start()
if __name__ == '__main__':
test1()
