I'm running a background database processing task, and I only want to
have ONE task running so I don't have to worry about race conditions.
What is the best way to do this?
I run this task from a cron @reboot. It runs this script:
while True:
time.sleep(10)
process_queue()
I'm worried that I might accidentally run two web2py processes at the
same time, each starting a cron job, and then I'd have two running and
mess up my data. So I want this script to check to see if another one
is currently running, and if so, to give up.
I considered making an entry in a database like
"background_task_running = true", but how can I guarantee that it gets
set to false if my web2py crashes? I don't want to have to manually
reset that field all the time.
Is it best to see if this process is currently running on the machine,
with os.system('ps aux | grep background_work.py'), but this isn't
cross-platform, and won't work if the process is running on another
machine. Is there a way to check if another of these processes is
connected to the postgresql database?
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