python——多进程共享资源

from multiprocessing import Queue,Pool
import multiprocessing,time,random

def write(q):

    for value in  ['A','B','C','D']:
        print ("Put %s to Queue!" % value)
        q.put(value)
        time.sleep(random.random())


def read(q,lock):
    while True:
        lock.acquire()
        if not q.empty():
            value=q.get(True)
            print ("Get %s from Queue" % value)
            time.sleep(random.random())
        else:
            break
        lock.release()

if __name__ == "__main__":
    manager=multiprocessing.Manager()
    q=manager.Queue()
    p=Pool()
    lock=manager.Lock()
    pw=p.apply_async(write,args=(q,))
    pr=p.apply_async(read,args=(q,lock))
    p.close()
    p.join()
    print ("所有数据都写入并且读完")