python 生产消费案例1

#!/usr/bin/env python
#-*- coding:utf-8 -*-
import threading,random,time
VALUE = 1000
Lock = threading.Lock()

class Product(threading.Thread):
    def run(self):
        global VALUE
        while True:
            m = random.randint(100,500)
            Lock.acquire()
            VALUE += m
            print('%s 生成了数字 %s ，现在数字大小为 %s ' %(threading.current_thread(),m,VALUE))
            Lock.release()
            time.sleep(0.5)

class Consumer(threading.Thread):
    def run(self):
        global VALUE
        while True:
            m = random.randint(200,600)
            Lock.acquire()
            if VALUE >= m:
                VALUE -= m
                print('%s 消费了数字 %s ，现在数字大小为 %s ' %(threading.current_thread(),m,VALUE))
            else:
                print('数字 %s 太小' %VALUE)
            Lock.release()
            time.sleep(0.5)


def main():
    for x in range(3):
        t = Consumer(name='消费者线程%d' %(x))
        t.start()

    for x in range(5):
        t = Product(name='生产者线程%d' %(x))
        t.start()

if __name__ == '__main__':
    main()