python 多线程 信号量semaphore(并行编程 5)

import threading import time import random

semaphore = threading.Semaphore(0)

def consumer(): print("consumer is waiting.") semaphore.acquire() print("Consumer notify: consumed item number %s." % item)

def producer(): global item time.sleep(10) item = random.randint(1, 1000) print("producer nofity: produced item number %s." % item) semaphore.release()

if name == "main":

for i in range(0, 5):
    t1 = threading.Thread(target=producer)
    t2 = threading.Thread(target=consumer)
    t1.start()
    t2.start()
    t1.join()
    t2.join()
print("program teminated.")

threading.Semaphore(0)

se.acquire() se.release()