import multiprocessing
import time
from multiprocessing import Manager, Process


def producer(d):
    l = []
    for i in range(10):
        d.append(i)
        if i == 4:
            d[:] = []
        time.sleep(0.1)


def consumer(d):
    for i in range(10000):
        start_time = time.time()
        print(len(d))
        end_time = time.time()
        print("耗时：", end_time - start_time)
        time.sleep(1)


if __name__ == "__main__":
    with Manager() as manager:
        d = manager.list()
        p1 = multiprocessing.Process(target=producer, args=(d,))
        for i in range(100):
            p2 = multiprocessing.Process(target=consumer, args=(d,))
            p2.start()
        p1.start()
        p1.join()
        input()