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How to restrict execution of same class from two different consoles at same time?

 
Greenhorn
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How to restrict execution of same class from two different consoles at same time???

I am facing one problem. I want only one instance of the class to be running on my OS. I have written one loader program and want to execute only one instance of loader at a time. If I execute the loader from one console and while the first loader is running I want to prevent execution of second loader from the another console.Is there any way to restrict the execution of same class from two different consoles.

[ September 05, 2008: Message edited by: Shailesh S. ]

[ September 05, 2008: Message edited by: Shailesh S. ]
[ September 05, 2008: Message edited by: Bear Bibeault ]
 
Ranch Hand
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You probably have to use a method as in all other languages.

For example creating a lock file in the filesystem.
(Study the procedure carefully, to avoid common mistakes !)
 
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Please Use One Thread Per Question. Let's continue in this one.
 
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