# -*- encoding:utf-8 -*-

'''
@Author : dingjiawen
@Date : 2023/10/17 21:12
@Usage : Semaphore相关类：可以控制临界资源的数量，保证各个进程之间的互斥和同步。
@Desc : 尚且有问题，没法消费，程序卡住
'''

from multiprocessing import Process, Semaphore, Lock, Queue
import time
import random

buffer = Queue(10)
empty = Semaphore(2)
full = Semaphore(1)
lock = Lock()


class Consumer(Process):

    def run(self):
        global buffer, empty, full, lock
        while True:
            print('Consumer线程开始运行')
            full.acquire()
            lock.acquire()
            time.sleep(1)

            print('Consumer pop an {0}'.format(buffer.get()))
            time.sleep(1)
            lock.release()
            empty.release()
            print('Consumer 释放了锁')


class Producer(Process):
    def run(self):
        global buffer, empty, full, lock
        while True:
            empty.acquire()
            lock.acquire()
            print('Producer 添加了锁')
            num = random.randint(0,1)

            print('Producer append {0}'.format(num))
            buffer.put(num)
            time.sleep(1)
            lock.release()
            full.release()
            print('Producer 释放了锁')


if __name__ == '__main__':
    p = Producer()
    c = Consumer()
    p.daemon = c.daemon = True

    p.start()
    c.start()

    p.join()
    c.join()
    print('Ended!')