python 之队列

 

进程和线程模块下都有队列类。

 

线程队列：

# 后进先出->堆栈
q=queue.LifoQueue(3)
# 优先级队列,数字越小优先级越高
q=queue.PriorityQueue(3)

 

进程队列：

JoinableQueue示例：

import time,random
from multiprocessing import Process,JoinableQueue


def producer(name,q):
    count= 0
    while count<3:
        print('making,,,,')
        time.sleep(2)
        q.put(count,block=True,timeout=3)
        print('Producer %s has produced %s baozi'%(name,count))
        count += 1
    q.join()   # 直到队列清空，程序才会结束


def consumer(name,q):
    count = 0
    while count <3:
        time.sleep(1)
        if not q.empty():break
        data = q.get()
        print(data)
        print('consumer %s has eat %s baozi'%(name,count))
        count +=1
        q.task_done()


if __name__ == '__main__':
    # 容器
    q = JoinableQueue()
    # 生产者们
    p = Process(target=producer,args=('A',q,))
    p.start()
    # 消费者们
    c = Process(target=consumer,args=('B',q,))
    c.daemon = True
    c.start()
    p.join()