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How to handle file concurrency in UNIX shellscripting

sridevi karampudi
Greenhorn

Joined: Dec 17, 2010
Posts: 5


currently if two servers are accesing same file if there is difference between there access time then one server will take the file and process successully, but we are facing ISSUE if there is NO Difference between there access time then two servers are taking the file but one server is processing file and other server is getting stuck and its not able to come out of the script.

But we must handle the scenario, even if two servers access same file at a time , then only one server must be able to take the file and other server must do other file process or must wait for the file.

Please help me in writing the UNIX script to handle file concureny in UNIX . Even if two servers try to access same file simultaneously only one server must be able to take file and process.

Regards,
Sridevi

Tim Holloway
Saloon Keeper

Joined: Jun 25, 2001
Posts: 16020
    
  20

What you need is a semaphore that the different processes can queue up on. This can be done in a shell script, but it's been about 4 years since I looked at it and I don't remember how it's done anymore. About the best I can suggest is google, although I think I may have found it in the bash info file.


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subject: How to handle file concurrency in UNIX shellscripting