BlockingIOError: [Errno 35] Resource temporarily unavailable

[sleekmike]

Hello,
I am trying to run a Flask App in which tendo was used, I have installed tendo successfully but when I try to run the app I get the error below:

• Environment: production
  WARNING: This is a development server. Do not use it in a production deployment.
  Use a production WSGI server instead.
• Debug mode: on
• Running on http://0.0.0.0:8080/ (Press CTRL+C to quit)
• Restarting with stat
  Another instance is already running, quitting.
  Traceback (most recent call last):
  File "/Users/macbook/Desktop/securityPI/pi/lib/python3.7/site-packages/tendo/singleton.py", line 66, in init
  fcntl.lockf(self.fp, fcntl.LOCK_EX | fcntl.LOCK_NB)
  BlockingIOError: [Errno 35] Resource temporarily unavailable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/Users/macbook/Desktop/securityPI/prgms/webPrgm.py", line 155, in
me = singleton.SingleInstance()
File "/Users/macbook/Desktop/securityPI/pi/lib/python3.7/site-packages/tendo/singleton.py", line 70, in init
raise SingleInstanceException()
tendo.singleton.SingleInstanceException

I am using a Mac running macOS Catalina 10.15 and python3.7

[liorp]

Hi, I couldn't replicate your use case. Can you help me with some more information? The code, perhaps?

[sergem155]

Same issue here, running a script from cron:

#!/usr/bin/python3
from tendo import singleton

def main(argv=None):
	# ensure single instance
	me = singleton.SingleInstance()
if __name__ == "__main__":
	sys.exit(main())