python使用queue队列实现生产者消费者

Bertha 。 2022-06-15 09:41 149阅读 0赞

queue使用方法，[<<详情参考>>][Link 1]  
使用queue队列实现生产者消费者问题  
另threading.condition也可实现生产者消费者问题，[<<详情参考>>][Link 2]

示例：  
生产者可以有多个，消费者可以有多个，但是市场容量是有一定限度的  
一件产品。投放到市场上，市场需求可以看作一个箱子box，是容量限度  
当小于box大小，即队列没有满full，生产者可以生产，否则等待消费者消费，生产者有生产效率，使用speed表示  
当产品大于0，即队列不为空null，才可进行消费，否则就等待生产者生产

import threading
    import queue
    import time
    import random
    from decimal import Decimal
    
    box=15
    queuelist = queue.Queue(box)
    
    class GoodsProduce(threading.Thread):
        def __init__(self,companyName,produceSpeed,info):
            super(GoodsProduce,self).__init__()
            self.companyName=companyName
            self.produceSpeed=Decimal(2/produceSpeed).quantize(Decimal('0.00'))
            self.info=info
        def run(self):
            while True:
               if not queuelist.full():
                  time.sleep(self.produceSpeed)
                  str="goods-%d"%random.randint(1,100)
                  queuelist.put(str)
                  print "GoodsProduce : %s create %s , now box have :%d" % (self.companyName,str, queuelist.qsize())
               else:
                   print "NOTE: BOX is full , size %d ,filled %d" % (box, box)
                   time.sleep(1)
        def show(self):
            print "companyName -- %s ,produceSpeed -- %s, infomation -- %s"%(self.companyName,self.produceSpeed,self.info)
    
    class GoodsConsume(threading.Thread):
        def __init__(self,cname,area,info):
            super(GoodsConsume,self).__init__()
            self.cname=cname
            self.area=area
            self.info=info
        def run(self):
            while True:
                if not queuelist.empty():
                    gname=queuelist.get()
                    print "GoodsConsumer %s get %s , now box have :%d" % (self.cname,gname, queuelist.qsize())
                else :
                    time.sleep(1)
                    if  queuelist.empty():
                       print "NOTE: BOX is null ,please wait ... size %d ,fillin 0" % (box)
    
                time.sleep(2)
        def show(self):
            print "GoodsConsume %s area -- %s ,infomation -- %s"%(self.cname,self.area,self.info)
    
    
    if __name__ == "__main__":
        for server_num in range(0, 2):
            server = GoodsProduce("Prd-%d"%server_num,server_num+1,"this is %d prd company"%server_num)
            server.start()
            server.show()
    
        for customer_num in range(0, 5):
            customer = GoodsConsume("cus-%d"%customer_num,"area-%d"%customer_num,"this is %d customer"%customer_num)
            customer.start()
            customer.show()

输出：

companyName -- Prd-0 ,produceSpeed -- 2.00, infomation -- this is 0 prd company
    companyName -- Prd-1 ,produceSpeed -- 1.00, infomation -- this is 1 prd company
    GoodsConsume cus-0 area -- area-0 ,infomation -- this is 0 customer
    GoodsConsume cus-1 area -- area-1 ,infomation -- this is 1 customer
    GoodsConsume cus-2 area -- area-2 ,infomation -- this is 2 customer
    GoodsConsume cus-3 area -- area-3 ,infomation -- this is 3 customer
    GoodsConsume cus-4 area -- area-4 ,infomation -- this is 4 customer
    GoodsProduce : Prd-1 create goods-16 , now box have :1
    GoodsProduce : Prd-0 create goods-9 , now box have :2
    GoodsProduce : Prd-1 create goods-44 , now box have :3
    GoodsConsumer cus-1 get goods-16 , now box have :2
    GoodsConsumer cus-2 get goods-9 , now box have :1
    GoodsConsumer cus-0 get goods-44 , now box have :0
    GoodsProduce : Prd-1 create goods-41 , now box have :1
    GoodsConsumer cus-3 get goods-41 , now box have :0
    GoodsProduce : Prd-0 create goods-61 , now box have :1
    GoodsProduce : Prd-1 create goods-71 , now box have :2
    GoodsConsumer cus-1 get goods-61 , now box have :1
    GoodsConsumer cus-2 get goods-71 , now box have :0
    NOTE: BOX is null ,please wait ...  size 15 ,fillin 0

[Link 1]: http://blog.csdn.net/comprel/article/details/72811400
[Link 2]: http://blog.csdn.net/comprel/article/details/72798407