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from multiprocessing import Process, Semaphore, Lock

buffer = []
empty = Semaphore(2)
full = Semaphore(0)
lock = Lock()


class Consumer(Process):
    
    def run(self):
        global buffer, empty, full, lock
        while True:
            print buffer
            full.acquire()
            print 'Consumer buffer', buffer
            lock.acquire()
            print buffer
            buffer.pop()
            print('Consumer pop an element, Now buffer', buffer)
            lock.release()
            empty.release()


class Producer(Process):

    def run(self):
        global buffer, empty, full, lock
        while True:
            empty.acquire()
            lock.acquire()
            buffer.append(1)
            print('Producer append an element, Now buffer', buffer)
            print buffer
            lock.release()
            full.release()


if __name__ == '__main__':
    p = Producer()
    c = Consumer()
    p.daemon = c.daemon = True
    p.start()
    c.start()
    p.join()
    c.join()
    print 'Ended!'