I haven't personally used File::NFSLock, but from what I read in the docs, if you request an exclusive lock, only one process will get the lock. The other process may block until the lock becomes free, or until a specified time has passed. If the time passes before the lock becomes free, the return lock will be undef.
The example included in the module documentation,seems understandable.
http://search.cpan.org/~bbb/File-NFSLock-1.21/lib/File/NFSLock.pm
However not having used this module, I can only assume that it works as advertised. Are you aware of anything to the contrary?
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