A distributed semaphore and mutex built on Redis.
To install redis-semaphore, simply:
pip install redis-semaphore
Or alternatively, you can download the repository and install manually by doing:
git clone git@github.com:bluele/redis-semaphore.git
cd redis-semaphore
python setup.py install
from redis import Redis
from redis_semaphore import Semaphore
from threading import Thread
import urllib2
import time
semaphore = Semaphore(Redis(), count=2, namespace='example')
def task(i):
url = 'https://www.google.co.jp/'
with semaphore:
print('id: {} => {}'.format(i, urllib2.urlopen(url).code))
print('sleep...')
time.sleep(2)
def main():
threads = list()
for i in range(5):
threads.append(Thread(target=task, args=(i,)))
for th in threads:
th.start()
for th in threads:
th.join()
if __name__ == '__main__':
main()