from threading import Thread, Condition
import time
import random

queue = []
BUFF_SIZE = 10
condition = Condition()


class ProducerThread(Thread):
    def run(self):
        nums = range(5)
        global queue

        while True:

            condition.acquire()
            if len(queue) == BUFF_SIZE:
                # Queue full, producer is waiting
                condition.wait()
                # Space in queue, Consumer notified the producer

            num = random.choice(nums)
            queue.append(num)
            print("Produced ", num)
            condition.notify()
            condition.release()
            time.sleep(random.random() * 2)


class ConsumerThread(Thread):
    def run(self):
        global queue

        while True:

            condition.acquire()
            if not queue:
                # Nothing in queue, consumer is waiting
                condition.wait()
                # Producer added something to queue and notified the consumer

            num = queue.pop(0)
            print("Consumed ", num)
            condition.notify()
            condition.release()
            time.sleep(random.random() * 2)


ProducerThread().start()
ConsumerThread().start()