from multiprocessing import Process,Lock
import time,random

def task1(lock):
    # 要开始使用了 上锁
    lock.acquire()       #就等同于一个if判断
    print("hello iam jerry")
    time.sleep(random.randint(0, 2))
    print("gender is boy")
    time.sleep(random.randint(0, 2))
    print("age is  15")
    # 用完了就解锁
    lock.release()

def task2(lock):
    lock.acquire()
    print("hello iam owen")
    time.sleep(random.randint(0,2))
    print("gender is girl")
    time.sleep(random.randint(0,2))
    print("age is  48")
    lock.release()

def task3(lock):
    lock.acquire()
    print("hello iam jason")
    time.sleep(random.randint(0,2))
    print("gender is women")
    time.sleep(random.randint(0,2))
    print("age is  26")
    lock.release()

if __name__ == ‘__main__‘:
    lock = Lock()

    p1 = Process(target=task1,args=(lock,))
    p2 = Process(target=task2,args=(lock,))
    p3 = Process(target=task3,args=(lock,))

    p1.start()
    # p1.join()

    p2.start()
    # p2.join()

    p3.start()
    # p3.join()

    # print("故事结束!")
    
# 锁的伪代码实现 

# if my_lock == False:
#     my_lock = True
#	  #被锁住的代码
	  my_lock = False 解锁

from multiprocessing import Process,Manager,Lock
import time


def task(data,l):
    l.acquire()
    num = data["num"] #
    time.sleep(0.1)
    data["num"] = num - 1
    l.release()

if __name__ == ‘__main__‘:
    # 让Manager开启一个共享的字典
    m = Manager()
    data = m.dict({"num":10})

    l = Lock()

    for i in range(10):
        p = Process(target=task,args=(data,l))
        p.start()

    time.sleep(2)
    print(data)

from multiprocessing import Queue
# 创建队列  不指定maxsize 则没有数量限制
q = Queue(3)
# 存储元素
# q.put("abc")
# q.put("hhh")
# q.put("kkk")

# print(q.get())
# q.put("ooo")    # 如果容量已经满了,在调用put时将进入阻塞状态 直到有人从队列中拿走数据有空位置 才会继续执行

#取出元素
# print(q.get())# 如果队列已经空了,在调用get时将进入阻塞状态 直到有人从存储了新的数据到队列中 才会继续

# print(q.get())
# print(q.get())


#block 表示是否阻塞 默认是阻塞的   # 当设置为False 并且队列为空时 抛出异常
q.get(block=True,timeout=2)
# block 表示是否阻塞 默认是阻塞的   # 当设置为False 并且队列满了时 抛出异常
# q.put("123",block=False,)
# timeout 表示阻塞的超时时间 ,超过时间还是没有值或还是没位置则抛出异常  仅在block为True有效

def eat(q):
    for i in range(10):
        # 要消费
        rose = q.get()
        time.sleep(random.randint(0, 2))
        print(rose,"吃完了!")

# 生产任务
def make_rose(q):
    for i in range(10):
        # 再生产
        time.sleep(random.randint(0, 2))
        print("第%s盘青椒肉丝制作完成!" % i)
        rose = "第%s盘青椒肉丝" % i
        # 将生成完成的数据放入队列中
        q.put(rose)

if __name__ == ‘__main__‘:
    # 创建一个共享队列
    q = Queue()
    make_p = Process(target=make_rose,args=(q,))
    eat_p =  Process(target=eat,args=(q,))


    make_p.start()
    eat_p.start()