pheanstalk:put will be blocking when reserve() is blocking

I am so confused why put will be blocking when reserve() is blocking in pheanstalk, I have write two function:

1. put function :

2. worker function:

both of these are on a same host, but when i exec the function run(), if it's blocking; the function put() will blocking too, I am so confused.

er, because the cron job write after the session instance; and session add a file lock.