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  Ensure 1 running program  (Read 2249 times)
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Offline nech_neb

Junior Devvie




Java for LIFE !!!


« Posted 2003-11-27 22:41:04 »

Hi all,

I want to ensure that only 1 copy of my
program is running at once.

What is the suggested way of doing this?

Thanks in advance,
Much appriciated.
Offline Herkules

Senior Devvie




Friendly fire isn't friendly!


« Reply #1 - Posted 2003-11-28 04:16:42 »

hm - in win32 it is done with a named mutex.

Nothing can stop the user from starting another JVM .... maybe you can exploit the new properties API? Although this has to be handled with care, esp. concerning the shutdown procedure.

Just set a property saying that the program is already running and exit() if you find that the resp. property is already set.

Maybe a program should update that property every minute or so with a new timestamp. That could prevent from being unable to run just bc. a former instance crashed w/o removing the tag in the properties.

HARDCODE    --     DRTS/FlyingGuns/JPilot/JXInput  --    skype me: joerg.plewe
Offline swpalmer

JGO Coder


Exp: 12 years


Where's the Kaboom?


« Reply #2 - Posted 2003-11-28 11:45:58 »

Create a lock file in a known location.  If you can lock the file you are the only one of your app running.  be sure to delete it on exit, and or warn when starting that a previous instance may have crashed if the lock file is found.

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