This ruby gem allows you create a lock file on disk right before it yields given code block. It would not allow to yield the block again while the first one finished (ie while lock file exists). This gem currently works on UNIX operating systems. This gem should not be used on NFS (lwn.net/Articles/251004/)
include Lockfile with_lock_file(LOCK_FILE_PATH) do ... code that should not be launched simultaneously end
TO FORCE STOP
include Lockfile Lockfile.release_lock(LOCK_FILE_PATH)
a UNIX operating system
sudo gem install cleverua-lockfile
(The MIT License)
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