Ah! That sounds great! I will try using gluon's portalocker. On Feb 18, 3:41 pm, mdipierro <[email protected]> wrote: > I would use a file and lock the file when the process is running. You > can check if the file is locked. When the process ends the file will > be automatically unlocked. > > On Feb 18, 5:13 pm, Michael Toomim <[email protected]> wrote: > > > > > 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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