def run(self):
global condition, products, urls
while True:
if condition.acquire():
if urls.url_size() <= 20:
urls.add_new_url(Spider.crawl_url(self.keyword, products))
products += 1
print("Producer(%s):deliver one, now products:%s" %
(self.name, urls.url_size()))
condition.notify()
pass
else:
condition.wait()
# stop
if products >= 100:
break
condition.release()
