Look here <http://www.lshift.net/blog/2008/11/05/simple-inter-process-locks>. It seems to be a solution for that problem.
On Thu, Feb 18, 2010 at 11:45 PM, Michael Toomim <[email protected]> wrote: > 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? > > -- > You received this message because you are subscribed to the Google Groups > "web2py-users" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<web2py%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/web2py?hl=en. > > -- You received this message because you are subscribed to the Google Groups "web2py-users" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/web2py?hl=en.
